[1] The deterioration of a metal by an electrochemical process is commonly termed as –
A.
Erosion
B.
Corrosion
C.
Passivation
D.
Abrasion
Ans:
Corrosion
Explanation :
Corrosion can be defined as the deterioration of materials by chemical processes. Of these, the most important by far is electrochemical corrosion of metals, in which the oxidation process M ? M+ + e– is facilitated by the presence of a suitable electron acceptor, sometimes referred to in corrosion science as a depolarizer.
[2] The chief constituent of natural gas is:
A.
Methane
B.
Helium
C.
Nitrogen
D.
Propalie
Ans:
Methane
Explanation :
Natural gas is a naturally occurring hydrocarbon has mixture consisting primarily of methane (CH4). However, it also includes varying amounts of other higher alkanes (ethane, propane), and a small percentage of carbon dioxide, nitrogen, hydrogen sulfide, or helium.
[3] The source of energy that causes the least global warming is –
A.
Coal
B.
Geothermal energy
C.
Natural Gas
D.
Petroleum
Ans:
Natural Gas
Explanation :
Fossil fuels — coal, petroleum, and natural gas — are the primary culprit behind climate change. They contribute more than 80 percent of greenhouse gas emissions — and 98 percent of CO2 emissions alone. On the contrary, Geothermal energy is thermal energy generated and stored in the Earth. It is clean and sustainable.
[4] Which of the following is not a donor atom?
A.
Phosphorus
B.
Antimony
C.
Arsenic
D.
Aluminium
Ans:
Aluminium
Explanation :
Aluminium is an acceptor atom, an impurity atom in a semiconductor, which can accept or take up one or more electrons from the crystal and become negatively charged. In semiconductor physics. It is a dopant atom that when added to a semiconductor can form a p-type region.
[5] Formic acid is produced by –
A.
White ants
B.
Cockroaches
C.
Red ants
D.
Mosquitoes
Ans:
Red ants
Explanation :
Formic acid (HCO2H) occurs naturally, most notably in some ants. The word "formic" comes from the Latin word for ant, formica, referring to its early isolation by the distillation of ant bodies. It is this com - pound that causes most of the irritation that occurs immediately following an ant bite or a bee sting.
[6] Which one of the following forms of phosphorus is most reactive?
A.
Black phosphorus
B.
White phosphorus
C.
Violet phosphorus
D.
Red phosphorus
Ans:
White phosphorus
Explanation :
White phosphorus is the most reactive form of phosphorus. It is made up of discrete P4 tetrahedra which are subjected to very high angular strain as the angles is 60 degrees. This high angular strain makes white phosphorus unstable and highly reactive. It ignites spontaneously at about 50°C, and at much lower temperatures if finely divided.
[7] Rcmoval of carbon particles from air involves the principle of –
A.
Precipitation
B.
FiIteration
C.
Electrophoresis
D.
Sedimentation
Ans:
Electrophoresis
Explanation :
Carbon particles in air are colloidal in nature and carry negative charge. The removal of carbon parities from air involves the principle of electrophoresis. Carbon particles get precipitated by losing their charge and, thus, the air which finally comes out is free from them.
[8] Which of the following acts as best adsorbent?
A.
Charcoal
B.
Activated Charcoal
C.
Activated Coconut Charcoal
D.
Carbon black
Ans:
Activated Coconut Charcoal
Explanation :
Activated coconut charcoal is a highly absorbent material with millions of tiny pores that can capture, bind, and remove unwanted materials. The porous surface has a negative electric charge that attracts positively charged toxins and gas to be carried easily out of the body. It is used medicinally as well as in air and water purifiers.
[9] Which of the following is used as no coating for Cooking utensils?
A.
Perspex
B.
Styrofoam
C.
Polystyrene
D.
Teflon
Ans:
Teflon
Explanation :
The non-stick coating used mainly for coating cooking utensils is made using PTFE (polytetrafluoroeth- ylene) that is also known by the name Teflon. Teflon is an inert polymer with high thermal and chemical resistance. Besides, it is hydrophobic: neither water nor water-containing substances wet it and it has one of the lowest coefficients of friction of any solid.
[10] The least preferred technique in the disposal of Municipal Solid Waste is -
A.
Incineration
B.
Composting
C.
Land filling
D.
Bricketting
Ans:
Bricketting
Explanation :
Some of the methods of solid waste disposal and management are : • Open burning • Dumping into the sea • Sanitary Landfills • Incineration • Composting • Ploughing in fields • Hog feeding • Grinding and discharging into sewers • Salvaging • Fermentation and biological digestion Bricketting that involves the solidification of preprocessed municipal solid waste into fuel pellets or briquettes is the least preferred method of solid waste disposal.
[11] Which is the heaviest metal among the following?
A.
Gold
B.
Silver
C.
Iron
D.
Copper
Ans:
Gold
Explanation :
The heaviness of any metal is defined with reference to high densities, atomic weights, or atomic numbers. The atomic masses of the given elements are: Gold: 196.96654; Silver: 107.8682; Copper: 63.546; Iron: 55.847. So the heaviest metal is gold, followed by silver, copper and iron.
[12] Which of the following is a commercial source of energy?
A.
Agricultural waste
B.
Dried dung
C.
Sun
D.
Natural gas
Ans:
Natural gas
Explanation :
Energy is broadly classified as commercial and non-commercial energy. Firewood, agricultural waste (straw, etc.) and animals waste (cowdung) are the important components of non-commercial energy. Coal, petroleum products, natural gas and, electricity are the important components of commercial energy. These goods are largely used for commercial purposes in the factories and farms.
[13] Which of the following is used to make light weight, but strong plastic?
A.
Nylon
B.
Polythene
C.
Polyvinyl Chloride
D.
Methyl Methacrylate
Ans:
Polyvinyl Chloride
Explanation :
Polyvinyl chloride (PVC) is a common, strong but lightweight plastic that is used in making tough plastic. It is used for flexible applications such as insulating cables. It is the third-most widely produced synthetic plastic polymer, after polyethylene and polypropylene.
[14] Which gas emitted by power stations causes acid rain?
A.
Carbon dioxide
B.
Sulphur dioxide
C.
Helium
D.
Nitrogen
Ans:
Sulphur dioxide
Explanation :
Sulfur dioxide (SO2) and nitrogen oxides (NOx) are the principal pollutants that cause acid rain. SO2 and NOx emissions released to the air react with water vapor and other chemicals to form acids that fall back to Earth. Power plants burning coal and heavy oil produce over two-thirds of the annual SO2 emission.
[15] Heavy water is –
A.
Deuterium
B.
Rain water
C.
Tritium oxide
D.
Deuterium oxide
Ans:
Deuterium oxide
Explanation :
Heavy water is deuterium oxide (2H2O). It is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in normal water.
[16] Chemical composition of heavy water is –
A.
H2O2
B.
H2O
C.
HDO
D.
D2O
Ans:
D2O
Explanation :
The chemical composition of Heavy water (deuterium oxide) is 2H2O or D2O. It is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in regular water.
[17] The most abundant element is -
A.
Calcium
B.
Silicon
C.
Oxygen
D.
Nitrogen
Ans:
Oxygen
Explanation :
On earth, oxygen is the most common element, making up about 47% of the earth's mass. Silicon is second, making up 28%, followed by aluminum (8%), iron (5%), magnesium (2%), calcium (4%), sodium (3%), and potassium (3%). All of the remaining elements together make up less than 1% of the earth's mass.
[18] Aluminium salt commonly used to stop bleeding is -
A.
Aluminium nitrate
B.
Aluminium sulphate
C.
Aluminium Chloride
D.
Potash alum
Ans:
Aluminium sulphate
Explanation :
Alum (Aluminium Sulfate) is used to stop bleeding. For example, Styptic pencils containing aluminium sulfate are used as astringents to prevent bleeding from small shaving cuts. It constricts blood vessels to stop the flow of blood.
[19] Hydrochloric acid is also known as -
A.
Galic acid
B.
Picric acid
C.
Muriatic acid
D.
Chloric acid
Ans:
Muriatic acid
Explanation :
Hydrochloric acid was historically called acidum sails, muriatic acid, and spirits of salt because it was produced from rock salt and green vitriol and later from the chemically similar substances common salt and sulfuric acid. Hydrochloric acid is found naturally in gastric acid.
[20] The inert gas used as beacon light is -
A.
Kr
B.
Ar
C.
He
D.
Ne
Ans:
Ne
Explanation :
Neon is used in neon discharge lamps and advertising signs because the neon lights are visible from long distances. Since the light of neon signs has a better penetrating power through fog and mist, the neon signs are also used in beacon lights for the safety of air and sea navigation.
[21] Who proposed first atomic theory?
A.
E.Rutherford
B.
De Broglie
C.
John Dalton
D.
D.I.Mendeleef
Ans:
John Dalton
Explanation :
Democritus first suggested the existence of the atom but it took almost two millennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844).
[22] The ultrapure metal is obtained by -
A.
Calcination
B.
Sublimation
C.
zone refining
D.
None of these
Ans:
zone refining
Explanation :
The principal stages in the production of ultrapure metals are the preparation of pure chemical compounds, the reduction of the compounds to the elementary state and further purification.
[23] Antacids are found in drugs that give relief to -
A.
Eye sight
B.
Stomach ache
C.
Acne
D.
Headache
Ans:
Stomach ache
Explanation :
An antacid is a substance which neutralizes stomach acidity. Antacids are taken by mouth to relieve heartburn, the major symptom of gastro-esophageal reflux disease, or acid indigestion which are a few of the common terms used to describe digestive upset.
[24] Heavy water is -
A.
Monoterium oxide
B.
Polyterium oxide
C.
Deuterium oxide
D.
Trisium oxide
Ans:
Deuterium oxide
Explanation :
Heavy water (D2O) is also called deuterium oxide. It is water composed of deuterium, the hydrogen isotope with a mass double that of ordinary hydrogen, and oxygen.
[25] Mark the compound which possesses ionic, covalent and coordinate bonds.
A.
NH4Cl
B.
SO3
C.
SO2
D.
H2O
Ans:
NH4Cl
Explanation :
Ammonium chloride (NH4Cl) is generally considered as an ionic compound but this compound has three different types of bond.
Explanation :
Corrosion can be defined as the deterioration of materials by chemical processes. Of these, the most important by far is electrochemical corrosion of metals, in which the oxidation process M ? M+ + e– is facilitated by the presence of a suitable electron acceptor, sometimes referred to in corrosion science as a depolarizer.
[2] The chief constituent of natural gas is:
A.
Methane
B.
Helium
C.
Nitrogen
D.
Propalie
Ans:
Methane
Explanation :
Natural gas is a naturally occurring hydrocarbon has mixture consisting primarily of methane (CH4). However, it also includes varying amounts of other higher alkanes (ethane, propane), and a small percentage of carbon dioxide, nitrogen, hydrogen sulfide, or helium.
[3] The source of energy that causes the least global warming is –
A.
Coal
B.
Geothermal energy
C.
Natural Gas
D.
Petroleum
Ans:
Natural Gas
Explanation :
Fossil fuels — coal, petroleum, and natural gas — are the primary culprit behind climate change. They contribute more than 80 percent of greenhouse gas emissions — and 98 percent of CO2 emissions alone. On the contrary, Geothermal energy is thermal energy generated and stored in the Earth. It is clean and sustainable.
[4] Which of the following is not a donor atom?
A.
Phosphorus
B.
Antimony
C.
Arsenic
D.
Aluminium
Ans:
Aluminium
Explanation :
Aluminium is an acceptor atom, an impurity atom in a semiconductor, which can accept or take up one or more electrons from the crystal and become negatively charged. In semiconductor physics. It is a dopant atom that when added to a semiconductor can form a p-type region.
[5] Formic acid is produced by –
A.
White ants
B.
Cockroaches
C.
Red ants
D.
Mosquitoes
Ans:
Red ants
Explanation :
Formic acid (HCO2H) occurs naturally, most notably in some ants. The word "formic" comes from the Latin word for ant, formica, referring to its early isolation by the distillation of ant bodies. It is this com - pound that causes most of the irritation that occurs immediately following an ant bite or a bee sting.
[6] Which one of the following forms of phosphorus is most reactive?
A.
Black phosphorus
B.
White phosphorus
C.
Violet phosphorus
D.
Red phosphorus
Ans:
White phosphorus
Explanation :
White phosphorus is the most reactive form of phosphorus. It is made up of discrete P4 tetrahedra which are subjected to very high angular strain as the angles is 60 degrees. This high angular strain makes white phosphorus unstable and highly reactive. It ignites spontaneously at about 50°C, and at much lower temperatures if finely divided.
[7] Rcmoval of carbon particles from air involves the principle of –
A.
Precipitation
B.
FiIteration
C.
Electrophoresis
D.
Sedimentation
Ans:
Electrophoresis
Explanation :
Carbon particles in air are colloidal in nature and carry negative charge. The removal of carbon parities from air involves the principle of electrophoresis. Carbon particles get precipitated by losing their charge and, thus, the air which finally comes out is free from them.
[8] Which of the following acts as best adsorbent?
A.
Charcoal
B.
Activated Charcoal
C.
Activated Coconut Charcoal
D.
Carbon black
Ans:
Activated Coconut Charcoal
Explanation :
Activated coconut charcoal is a highly absorbent material with millions of tiny pores that can capture, bind, and remove unwanted materials. The porous surface has a negative electric charge that attracts positively charged toxins and gas to be carried easily out of the body. It is used medicinally as well as in air and water purifiers.
[9] Which of the following is used as no coating for Cooking utensils?
A.
Perspex
B.
Styrofoam
C.
Polystyrene
D.
Teflon
Ans:
Teflon
Explanation :
The non-stick coating used mainly for coating cooking utensils is made using PTFE (polytetrafluoroeth- ylene) that is also known by the name Teflon. Teflon is an inert polymer with high thermal and chemical resistance. Besides, it is hydrophobic: neither water nor water-containing substances wet it and it has one of the lowest coefficients of friction of any solid.
[10] The least preferred technique in the disposal of Municipal Solid Waste is -
A.
Incineration
B.
Composting
C.
Land filling
D.
Bricketting
Ans:
Bricketting
Explanation :
Some of the methods of solid waste disposal and management are : • Open burning • Dumping into the sea • Sanitary Landfills • Incineration • Composting • Ploughing in fields • Hog feeding • Grinding and discharging into sewers • Salvaging • Fermentation and biological digestion Bricketting that involves the solidification of preprocessed municipal solid waste into fuel pellets or briquettes is the least preferred method of solid waste disposal.
[11] Which is the heaviest metal among the following?
A.
Gold
B.
Silver
C.
Iron
D.
Copper
Ans:
Gold
Explanation :
The heaviness of any metal is defined with reference to high densities, atomic weights, or atomic numbers. The atomic masses of the given elements are: Gold: 196.96654; Silver: 107.8682; Copper: 63.546; Iron: 55.847. So the heaviest metal is gold, followed by silver, copper and iron.
[12] Which of the following is a commercial source of energy?
A.
Agricultural waste
B.
Dried dung
C.
Sun
D.
Natural gas
Ans:
Natural gas
Explanation :
Energy is broadly classified as commercial and non-commercial energy. Firewood, agricultural waste (straw, etc.) and animals waste (cowdung) are the important components of non-commercial energy. Coal, petroleum products, natural gas and, electricity are the important components of commercial energy. These goods are largely used for commercial purposes in the factories and farms.
[13] Which of the following is used to make light weight, but strong plastic?
A.
Nylon
B.
Polythene
C.
Polyvinyl Chloride
D.
Methyl Methacrylate
Ans:
Polyvinyl Chloride
Explanation :
Polyvinyl chloride (PVC) is a common, strong but lightweight plastic that is used in making tough plastic. It is used for flexible applications such as insulating cables. It is the third-most widely produced synthetic plastic polymer, after polyethylene and polypropylene.
[14] Which gas emitted by power stations causes acid rain?
A.
Carbon dioxide
B.
Sulphur dioxide
C.
Helium
D.
Nitrogen
Ans:
Sulphur dioxide
Explanation :
Sulfur dioxide (SO2) and nitrogen oxides (NOx) are the principal pollutants that cause acid rain. SO2 and NOx emissions released to the air react with water vapor and other chemicals to form acids that fall back to Earth. Power plants burning coal and heavy oil produce over two-thirds of the annual SO2 emission.
[15] Heavy water is –
A.
Deuterium
B.
Rain water
C.
Tritium oxide
D.
Deuterium oxide
Ans:
Deuterium oxide
Explanation :
Heavy water is deuterium oxide (2H2O). It is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in normal water.
[16] Chemical composition of heavy water is –
A.
H2O2
B.
H2O
C.
HDO
D.
D2O
Ans:
D2O
Explanation :
The chemical composition of Heavy water (deuterium oxide) is 2H2O or D2O. It is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in regular water.
[17] The most abundant element is -
A.
Calcium
B.
Silicon
C.
Oxygen
D.
Nitrogen
Ans:
Oxygen
Explanation :
On earth, oxygen is the most common element, making up about 47% of the earth's mass. Silicon is second, making up 28%, followed by aluminum (8%), iron (5%), magnesium (2%), calcium (4%), sodium (3%), and potassium (3%). All of the remaining elements together make up less than 1% of the earth's mass.
[18] Aluminium salt commonly used to stop bleeding is -
A.
Aluminium nitrate
B.
Aluminium sulphate
C.
Aluminium Chloride
D.
Potash alum
Ans:
Aluminium sulphate
Explanation :
Alum (Aluminium Sulfate) is used to stop bleeding. For example, Styptic pencils containing aluminium sulfate are used as astringents to prevent bleeding from small shaving cuts. It constricts blood vessels to stop the flow of blood.
[19] Hydrochloric acid is also known as -
A.
Galic acid
B.
Picric acid
C.
Muriatic acid
D.
Chloric acid
Ans:
Muriatic acid
Explanation :
Hydrochloric acid was historically called acidum sails, muriatic acid, and spirits of salt because it was produced from rock salt and green vitriol and later from the chemically similar substances common salt and sulfuric acid. Hydrochloric acid is found naturally in gastric acid.
[20] The inert gas used as beacon light is -
A.
Kr
B.
Ar
C.
He
D.
Ne
Ans:
Ne
Explanation :
Neon is used in neon discharge lamps and advertising signs because the neon lights are visible from long distances. Since the light of neon signs has a better penetrating power through fog and mist, the neon signs are also used in beacon lights for the safety of air and sea navigation.
[21] Who proposed first atomic theory?
A.
E.Rutherford
B.
De Broglie
C.
John Dalton
D.
D.I.Mendeleef
Ans:
John Dalton
Explanation :
Democritus first suggested the existence of the atom but it took almost two millennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844).
[22] The ultrapure metal is obtained by -
A.
Calcination
B.
Sublimation
C.
zone refining
D.
None of these
Ans:
zone refining
Explanation :
The principal stages in the production of ultrapure metals are the preparation of pure chemical compounds, the reduction of the compounds to the elementary state and further purification.
[23] Antacids are found in drugs that give relief to -
A.
Eye sight
B.
Stomach ache
C.
Acne
D.
Headache
Ans:
Stomach ache
Explanation :
An antacid is a substance which neutralizes stomach acidity. Antacids are taken by mouth to relieve heartburn, the major symptom of gastro-esophageal reflux disease, or acid indigestion which are a few of the common terms used to describe digestive upset.
[24] Heavy water is -
A.
Monoterium oxide
B.
Polyterium oxide
C.
Deuterium oxide
D.
Trisium oxide
Ans:
Deuterium oxide
Explanation :
Heavy water (D2O) is also called deuterium oxide. It is water composed of deuterium, the hydrogen isotope with a mass double that of ordinary hydrogen, and oxygen.
[25] Mark the compound which possesses ionic, covalent and coordinate bonds.
A.
NH4Cl
B.
SO3
C.
SO2
D.
H2O
Ans:
NH4Cl
Explanation :
Ammonium chloride (NH4Cl) is generally considered as an ionic compound but this compound has three different types of bond.
Explanation :
Fossil fuels — coal, petroleum, and natural gas — are the primary culprit behind climate change. They contribute more than 80 percent of greenhouse gas emissions — and 98 percent of CO2 emissions alone. On the contrary, Geothermal energy is thermal energy generated and stored in the Earth. It is clean and sustainable.
[4] Which of the following is not a donor atom?
A.
Phosphorus
B.
Antimony
C.
Arsenic
D.
Aluminium
Ans:
Aluminium
Explanation :
Aluminium is an acceptor atom, an impurity atom in a semiconductor, which can accept or take up one or more electrons from the crystal and become negatively charged. In semiconductor physics. It is a dopant atom that when added to a semiconductor can form a p-type region.
[5] Formic acid is produced by –
A.
White ants
B.
Cockroaches
C.
Red ants
D.
Mosquitoes
Ans:
Red ants
Explanation :
Formic acid (HCO2H) occurs naturally, most notably in some ants. The word "formic" comes from the Latin word for ant, formica, referring to its early isolation by the distillation of ant bodies. It is this com - pound that causes most of the irritation that occurs immediately following an ant bite or a bee sting.
[6] Which one of the following forms of phosphorus is most reactive?
A.
Black phosphorus
B.
White phosphorus
C.
Violet phosphorus
D.
Red phosphorus
Ans:
White phosphorus
Explanation :
White phosphorus is the most reactive form of phosphorus. It is made up of discrete P4 tetrahedra which are subjected to very high angular strain as the angles is 60 degrees. This high angular strain makes white phosphorus unstable and highly reactive. It ignites spontaneously at about 50°C, and at much lower temperatures if finely divided.
[7] Rcmoval of carbon particles from air involves the principle of –
A.
Precipitation
B.
FiIteration
C.
Electrophoresis
D.
Sedimentation
Ans:
Electrophoresis
Explanation :
Carbon particles in air are colloidal in nature and carry negative charge. The removal of carbon parities from air involves the principle of electrophoresis. Carbon particles get precipitated by losing their charge and, thus, the air which finally comes out is free from them.
[8] Which of the following acts as best adsorbent?
A.
Charcoal
B.
Activated Charcoal
C.
Activated Coconut Charcoal
D.
Carbon black
Ans:
Activated Coconut Charcoal
Explanation :
Activated coconut charcoal is a highly absorbent material with millions of tiny pores that can capture, bind, and remove unwanted materials. The porous surface has a negative electric charge that attracts positively charged toxins and gas to be carried easily out of the body. It is used medicinally as well as in air and water purifiers.
[9] Which of the following is used as no coating for Cooking utensils?
A.
Perspex
B.
Styrofoam
C.
Polystyrene
D.
Teflon
Ans:
Teflon
Explanation :
The non-stick coating used mainly for coating cooking utensils is made using PTFE (polytetrafluoroeth- ylene) that is also known by the name Teflon. Teflon is an inert polymer with high thermal and chemical resistance. Besides, it is hydrophobic: neither water nor water-containing substances wet it and it has one of the lowest coefficients of friction of any solid.
[10] The least preferred technique in the disposal of Municipal Solid Waste is -
A.
Incineration
B.
Composting
C.
Land filling
D.
Bricketting
Ans:
Bricketting
Explanation :
Some of the methods of solid waste disposal and management are : • Open burning • Dumping into the sea • Sanitary Landfills • Incineration • Composting • Ploughing in fields • Hog feeding • Grinding and discharging into sewers • Salvaging • Fermentation and biological digestion Bricketting that involves the solidification of preprocessed municipal solid waste into fuel pellets or briquettes is the least preferred method of solid waste disposal.
[11] Which is the heaviest metal among the following?
A.
Gold
B.
Silver
C.
Iron
D.
Copper
Ans:
Gold
Explanation :
The heaviness of any metal is defined with reference to high densities, atomic weights, or atomic numbers. The atomic masses of the given elements are: Gold: 196.96654; Silver: 107.8682; Copper: 63.546; Iron: 55.847. So the heaviest metal is gold, followed by silver, copper and iron.
[12] Which of the following is a commercial source of energy?
A.
Agricultural waste
B.
Dried dung
C.
Sun
D.
Natural gas
Ans:
Natural gas
Explanation :
Energy is broadly classified as commercial and non-commercial energy. Firewood, agricultural waste (straw, etc.) and animals waste (cowdung) are the important components of non-commercial energy. Coal, petroleum products, natural gas and, electricity are the important components of commercial energy. These goods are largely used for commercial purposes in the factories and farms.
[13] Which of the following is used to make light weight, but strong plastic?
A.
Nylon
B.
Polythene
C.
Polyvinyl Chloride
D.
Methyl Methacrylate
Ans:
Polyvinyl Chloride
Explanation :
Polyvinyl chloride (PVC) is a common, strong but lightweight plastic that is used in making tough plastic. It is used for flexible applications such as insulating cables. It is the third-most widely produced synthetic plastic polymer, after polyethylene and polypropylene.
[14] Which gas emitted by power stations causes acid rain?
A.
Carbon dioxide
B.
Sulphur dioxide
C.
Helium
D.
Nitrogen
Ans:
Sulphur dioxide
Explanation :
Sulfur dioxide (SO2) and nitrogen oxides (NOx) are the principal pollutants that cause acid rain. SO2 and NOx emissions released to the air react with water vapor and other chemicals to form acids that fall back to Earth. Power plants burning coal and heavy oil produce over two-thirds of the annual SO2 emission.
[15] Heavy water is –
A.
Deuterium
B.
Rain water
C.
Tritium oxide
D.
Deuterium oxide
Ans:
Deuterium oxide
Explanation :
Heavy water is deuterium oxide (2H2O). It is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in normal water.
[16] Chemical composition of heavy water is –
A.
H2O2
B.
H2O
C.
HDO
D.
D2O
Ans:
D2O
Explanation :
The chemical composition of Heavy water (deuterium oxide) is 2H2O or D2O. It is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in regular water.
[17] The most abundant element is -
A.
Calcium
B.
Silicon
C.
Oxygen
D.
Nitrogen
Ans:
Oxygen
Explanation :
On earth, oxygen is the most common element, making up about 47% of the earth's mass. Silicon is second, making up 28%, followed by aluminum (8%), iron (5%), magnesium (2%), calcium (4%), sodium (3%), and potassium (3%). All of the remaining elements together make up less than 1% of the earth's mass.
[18] Aluminium salt commonly used to stop bleeding is -
A.
Aluminium nitrate
B.
Aluminium sulphate
C.
Aluminium Chloride
D.
Potash alum
Ans:
Aluminium sulphate
Explanation :
Alum (Aluminium Sulfate) is used to stop bleeding. For example, Styptic pencils containing aluminium sulfate are used as astringents to prevent bleeding from small shaving cuts. It constricts blood vessels to stop the flow of blood.
[19] Hydrochloric acid is also known as -
A.
Galic acid
B.
Picric acid
C.
Muriatic acid
D.
Chloric acid
Ans:
Muriatic acid
Explanation :
Hydrochloric acid was historically called acidum sails, muriatic acid, and spirits of salt because it was produced from rock salt and green vitriol and later from the chemically similar substances common salt and sulfuric acid. Hydrochloric acid is found naturally in gastric acid.
[20] The inert gas used as beacon light is -
A.
Kr
B.
Ar
C.
He
D.
Ne
Ans:
Ne
Explanation :
Neon is used in neon discharge lamps and advertising signs because the neon lights are visible from long distances. Since the light of neon signs has a better penetrating power through fog and mist, the neon signs are also used in beacon lights for the safety of air and sea navigation.
[21] Who proposed first atomic theory?
A.
E.Rutherford
B.
De Broglie
C.
John Dalton
D.
D.I.Mendeleef
Ans:
John Dalton
Explanation :
Democritus first suggested the existence of the atom but it took almost two millennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844).
[22] The ultrapure metal is obtained by -
A.
Calcination
B.
Sublimation
C.
zone refining
D.
None of these
Ans:
zone refining
Explanation :
The principal stages in the production of ultrapure metals are the preparation of pure chemical compounds, the reduction of the compounds to the elementary state and further purification.
[23] Antacids are found in drugs that give relief to -
A.
Eye sight
B.
Stomach ache
C.
Acne
D.
Headache
Ans:
Stomach ache
Explanation :
An antacid is a substance which neutralizes stomach acidity. Antacids are taken by mouth to relieve heartburn, the major symptom of gastro-esophageal reflux disease, or acid indigestion which are a few of the common terms used to describe digestive upset.
[24] Heavy water is -
A.
Monoterium oxide
B.
Polyterium oxide
C.
Deuterium oxide
D.
Trisium oxide
Ans:
Deuterium oxide
Explanation :
Heavy water (D2O) is also called deuterium oxide. It is water composed of deuterium, the hydrogen isotope with a mass double that of ordinary hydrogen, and oxygen.
[25] Mark the compound which possesses ionic, covalent and coordinate bonds.
A.
NH4Cl
B.
SO3
C.
SO2
D.
H2O
Ans:
NH4Cl
Explanation :
Ammonium chloride (NH4Cl) is generally considered as an ionic compound but this compound has three different types of bond.
Explanation :
Formic acid (HCO2H) occurs naturally, most notably in some ants. The word "formic" comes from the Latin word for ant, formica, referring to its early isolation by the distillation of ant bodies. It is this com - pound that causes most of the irritation that occurs immediately following an ant bite or a bee sting.
[6] Which one of the following forms of phosphorus is most reactive?
A.
Black phosphorus
B.
White phosphorus
C.
Violet phosphorus
D.
Red phosphorus
Ans:
White phosphorus
Explanation :
White phosphorus is the most reactive form of phosphorus. It is made up of discrete P4 tetrahedra which are subjected to very high angular strain as the angles is 60 degrees. This high angular strain makes white phosphorus unstable and highly reactive. It ignites spontaneously at about 50°C, and at much lower temperatures if finely divided.
[7] Rcmoval of carbon particles from air involves the principle of –
A.
Precipitation
B.
FiIteration
C.
Electrophoresis
D.
Sedimentation
Ans:
Electrophoresis
Explanation :
Carbon particles in air are colloidal in nature and carry negative charge. The removal of carbon parities from air involves the principle of electrophoresis. Carbon particles get precipitated by losing their charge and, thus, the air which finally comes out is free from them.
[8] Which of the following acts as best adsorbent?
A.
Charcoal
B.
Activated Charcoal
C.
Activated Coconut Charcoal
D.
Carbon black
Ans:
Activated Coconut Charcoal
Explanation :
Activated coconut charcoal is a highly absorbent material with millions of tiny pores that can capture, bind, and remove unwanted materials. The porous surface has a negative electric charge that attracts positively charged toxins and gas to be carried easily out of the body. It is used medicinally as well as in air and water purifiers.
[9] Which of the following is used as no coating for Cooking utensils?
A.
Perspex
B.
Styrofoam
C.
Polystyrene
D.
Teflon
Ans:
Teflon
Explanation :
The non-stick coating used mainly for coating cooking utensils is made using PTFE (polytetrafluoroeth- ylene) that is also known by the name Teflon. Teflon is an inert polymer with high thermal and chemical resistance. Besides, it is hydrophobic: neither water nor water-containing substances wet it and it has one of the lowest coefficients of friction of any solid.
[10] The least preferred technique in the disposal of Municipal Solid Waste is -
A.
Incineration
B.
Composting
C.
Land filling
D.
Bricketting
Ans:
Bricketting
Explanation :
Some of the methods of solid waste disposal and management are : • Open burning • Dumping into the sea • Sanitary Landfills • Incineration • Composting • Ploughing in fields • Hog feeding • Grinding and discharging into sewers • Salvaging • Fermentation and biological digestion Bricketting that involves the solidification of preprocessed municipal solid waste into fuel pellets or briquettes is the least preferred method of solid waste disposal.
[11] Which is the heaviest metal among the following?
A.
Gold
B.
Silver
C.
Iron
D.
Copper
Ans:
Gold
Explanation :
The heaviness of any metal is defined with reference to high densities, atomic weights, or atomic numbers. The atomic masses of the given elements are: Gold: 196.96654; Silver: 107.8682; Copper: 63.546; Iron: 55.847. So the heaviest metal is gold, followed by silver, copper and iron.
[12] Which of the following is a commercial source of energy?
A.
Agricultural waste
B.
Dried dung
C.
Sun
D.
Natural gas
Ans:
Natural gas
Explanation :
Energy is broadly classified as commercial and non-commercial energy. Firewood, agricultural waste (straw, etc.) and animals waste (cowdung) are the important components of non-commercial energy. Coal, petroleum products, natural gas and, electricity are the important components of commercial energy. These goods are largely used for commercial purposes in the factories and farms.
[13] Which of the following is used to make light weight, but strong plastic?
A.
Nylon
B.
Polythene
C.
Polyvinyl Chloride
D.
Methyl Methacrylate
Ans:
Polyvinyl Chloride
Explanation :
Polyvinyl chloride (PVC) is a common, strong but lightweight plastic that is used in making tough plastic. It is used for flexible applications such as insulating cables. It is the third-most widely produced synthetic plastic polymer, after polyethylene and polypropylene.
[14] Which gas emitted by power stations causes acid rain?
A.
Carbon dioxide
B.
Sulphur dioxide
C.
Helium
D.
Nitrogen
Ans:
Sulphur dioxide
Explanation :
Sulfur dioxide (SO2) and nitrogen oxides (NOx) are the principal pollutants that cause acid rain. SO2 and NOx emissions released to the air react with water vapor and other chemicals to form acids that fall back to Earth. Power plants burning coal and heavy oil produce over two-thirds of the annual SO2 emission.
[15] Heavy water is –
A.
Deuterium
B.
Rain water
C.
Tritium oxide
D.
Deuterium oxide
Ans:
Deuterium oxide
Explanation :
Heavy water is deuterium oxide (2H2O). It is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in normal water.
[16] Chemical composition of heavy water is –
A.
H2O2
B.
H2O
C.
HDO
D.
D2O
Ans:
D2O
Explanation :
The chemical composition of Heavy water (deuterium oxide) is 2H2O or D2O. It is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in regular water.
[17] The most abundant element is -
A.
Calcium
B.
Silicon
C.
Oxygen
D.
Nitrogen
Ans:
Oxygen
Explanation :
On earth, oxygen is the most common element, making up about 47% of the earth's mass. Silicon is second, making up 28%, followed by aluminum (8%), iron (5%), magnesium (2%), calcium (4%), sodium (3%), and potassium (3%). All of the remaining elements together make up less than 1% of the earth's mass.
[18] Aluminium salt commonly used to stop bleeding is -
A.
Aluminium nitrate
B.
Aluminium sulphate
C.
Aluminium Chloride
D.
Potash alum
Ans:
Aluminium sulphate
Explanation :
Alum (Aluminium Sulfate) is used to stop bleeding. For example, Styptic pencils containing aluminium sulfate are used as astringents to prevent bleeding from small shaving cuts. It constricts blood vessels to stop the flow of blood.
[19] Hydrochloric acid is also known as -
A.
Galic acid
B.
Picric acid
C.
Muriatic acid
D.
Chloric acid
Ans:
Muriatic acid
Explanation :
Hydrochloric acid was historically called acidum sails, muriatic acid, and spirits of salt because it was produced from rock salt and green vitriol and later from the chemically similar substances common salt and sulfuric acid. Hydrochloric acid is found naturally in gastric acid.
[20] The inert gas used as beacon light is -
A.
Kr
B.
Ar
C.
He
D.
Ne
Ans:
Ne
Explanation :
Neon is used in neon discharge lamps and advertising signs because the neon lights are visible from long distances. Since the light of neon signs has a better penetrating power through fog and mist, the neon signs are also used in beacon lights for the safety of air and sea navigation.
[21] Who proposed first atomic theory?
A.
E.Rutherford
B.
De Broglie
C.
John Dalton
D.
D.I.Mendeleef
Ans:
John Dalton
Explanation :
Democritus first suggested the existence of the atom but it took almost two millennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844).
[22] The ultrapure metal is obtained by -
A.
Calcination
B.
Sublimation
C.
zone refining
D.
None of these
Ans:
zone refining
Explanation :
The principal stages in the production of ultrapure metals are the preparation of pure chemical compounds, the reduction of the compounds to the elementary state and further purification.
[23] Antacids are found in drugs that give relief to -
A.
Eye sight
B.
Stomach ache
C.
Acne
D.
Headache
Ans:
Stomach ache
Explanation :
An antacid is a substance which neutralizes stomach acidity. Antacids are taken by mouth to relieve heartburn, the major symptom of gastro-esophageal reflux disease, or acid indigestion which are a few of the common terms used to describe digestive upset.
[24] Heavy water is -
A.
Monoterium oxide
B.
Polyterium oxide
C.
Deuterium oxide
D.
Trisium oxide
Ans:
Deuterium oxide
Explanation :
Heavy water (D2O) is also called deuterium oxide. It is water composed of deuterium, the hydrogen isotope with a mass double that of ordinary hydrogen, and oxygen.
[25] Mark the compound which possesses ionic, covalent and coordinate bonds.
A.
NH4Cl
B.
SO3
C.
SO2
D.
H2O
Ans:
NH4Cl
Explanation :
Ammonium chloride (NH4Cl) is generally considered as an ionic compound but this compound has three different types of bond.
Explanation :
Carbon particles in air are colloidal in nature and carry negative charge. The removal of carbon parities from air involves the principle of electrophoresis. Carbon particles get precipitated by losing their charge and, thus, the air which finally comes out is free from them.
[8] Which of the following acts as best adsorbent?
A.
Charcoal
B.
Activated Charcoal
C.
Activated Coconut Charcoal
D.
Carbon black
Ans:
Activated Coconut Charcoal
Explanation :
Activated coconut charcoal is a highly absorbent material with millions of tiny pores that can capture, bind, and remove unwanted materials. The porous surface has a negative electric charge that attracts positively charged toxins and gas to be carried easily out of the body. It is used medicinally as well as in air and water purifiers.
[9] Which of the following is used as no coating for Cooking utensils?
A.
Perspex
B.
Styrofoam
C.
Polystyrene
D.
Teflon
Ans:
Teflon
Explanation :
The non-stick coating used mainly for coating cooking utensils is made using PTFE (polytetrafluoroeth- ylene) that is also known by the name Teflon. Teflon is an inert polymer with high thermal and chemical resistance. Besides, it is hydrophobic: neither water nor water-containing substances wet it and it has one of the lowest coefficients of friction of any solid.
[10] The least preferred technique in the disposal of Municipal Solid Waste is -
A.
Incineration
B.
Composting
C.
Land filling
D.
Bricketting
Ans:
Bricketting
Explanation :
Some of the methods of solid waste disposal and management are : • Open burning • Dumping into the sea • Sanitary Landfills • Incineration • Composting • Ploughing in fields • Hog feeding • Grinding and discharging into sewers • Salvaging • Fermentation and biological digestion Bricketting that involves the solidification of preprocessed municipal solid waste into fuel pellets or briquettes is the least preferred method of solid waste disposal.
[11] Which is the heaviest metal among the following?
A.
Gold
B.
Silver
C.
Iron
D.
Copper
Ans:
Gold
Explanation :
The heaviness of any metal is defined with reference to high densities, atomic weights, or atomic numbers. The atomic masses of the given elements are: Gold: 196.96654; Silver: 107.8682; Copper: 63.546; Iron: 55.847. So the heaviest metal is gold, followed by silver, copper and iron.
[12] Which of the following is a commercial source of energy?
A.
Agricultural waste
B.
Dried dung
C.
Sun
D.
Natural gas
Ans:
Natural gas
Explanation :
Energy is broadly classified as commercial and non-commercial energy. Firewood, agricultural waste (straw, etc.) and animals waste (cowdung) are the important components of non-commercial energy. Coal, petroleum products, natural gas and, electricity are the important components of commercial energy. These goods are largely used for commercial purposes in the factories and farms.
[13] Which of the following is used to make light weight, but strong plastic?
A.
Nylon
B.
Polythene
C.
Polyvinyl Chloride
D.
Methyl Methacrylate
Ans:
Polyvinyl Chloride
Explanation :
Polyvinyl chloride (PVC) is a common, strong but lightweight plastic that is used in making tough plastic. It is used for flexible applications such as insulating cables. It is the third-most widely produced synthetic plastic polymer, after polyethylene and polypropylene.
[14] Which gas emitted by power stations causes acid rain?
A.
Carbon dioxide
B.
Sulphur dioxide
C.
Helium
D.
Nitrogen
Ans:
Sulphur dioxide
Explanation :
Sulfur dioxide (SO2) and nitrogen oxides (NOx) are the principal pollutants that cause acid rain. SO2 and NOx emissions released to the air react with water vapor and other chemicals to form acids that fall back to Earth. Power plants burning coal and heavy oil produce over two-thirds of the annual SO2 emission.
[15] Heavy water is –
A.
Deuterium
B.
Rain water
C.
Tritium oxide
D.
Deuterium oxide
Ans:
Deuterium oxide
Explanation :
Heavy water is deuterium oxide (2H2O). It is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in normal water.
[16] Chemical composition of heavy water is –
A.
H2O2
B.
H2O
C.
HDO
D.
D2O
Ans:
D2O
Explanation :
The chemical composition of Heavy water (deuterium oxide) is 2H2O or D2O. It is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in regular water.
[17] The most abundant element is -
A.
Calcium
B.
Silicon
C.
Oxygen
D.
Nitrogen
Ans:
Oxygen
Explanation :
On earth, oxygen is the most common element, making up about 47% of the earth's mass. Silicon is second, making up 28%, followed by aluminum (8%), iron (5%), magnesium (2%), calcium (4%), sodium (3%), and potassium (3%). All of the remaining elements together make up less than 1% of the earth's mass.
[18] Aluminium salt commonly used to stop bleeding is -
A.
Aluminium nitrate
B.
Aluminium sulphate
C.
Aluminium Chloride
D.
Potash alum
Ans:
Aluminium sulphate
Explanation :
Alum (Aluminium Sulfate) is used to stop bleeding. For example, Styptic pencils containing aluminium sulfate are used as astringents to prevent bleeding from small shaving cuts. It constricts blood vessels to stop the flow of blood.
[19] Hydrochloric acid is also known as -
A.
Galic acid
B.
Picric acid
C.
Muriatic acid
D.
Chloric acid
Ans:
Muriatic acid
Explanation :
Hydrochloric acid was historically called acidum sails, muriatic acid, and spirits of salt because it was produced from rock salt and green vitriol and later from the chemically similar substances common salt and sulfuric acid. Hydrochloric acid is found naturally in gastric acid.
[20] The inert gas used as beacon light is -
A.
Kr
B.
Ar
C.
He
D.
Ne
Ans:
Ne
Explanation :
Neon is used in neon discharge lamps and advertising signs because the neon lights are visible from long distances. Since the light of neon signs has a better penetrating power through fog and mist, the neon signs are also used in beacon lights for the safety of air and sea navigation.
[21] Who proposed first atomic theory?
A.
E.Rutherford
B.
De Broglie
C.
John Dalton
D.
D.I.Mendeleef
Ans:
John Dalton
Explanation :
Democritus first suggested the existence of the atom but it took almost two millennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844).
[22] The ultrapure metal is obtained by -
A.
Calcination
B.
Sublimation
C.
zone refining
D.
None of these
Ans:
zone refining
Explanation :
The principal stages in the production of ultrapure metals are the preparation of pure chemical compounds, the reduction of the compounds to the elementary state and further purification.
[23] Antacids are found in drugs that give relief to -
A.
Eye sight
B.
Stomach ache
C.
Acne
D.
Headache
Ans:
Stomach ache
Explanation :
An antacid is a substance which neutralizes stomach acidity. Antacids are taken by mouth to relieve heartburn, the major symptom of gastro-esophageal reflux disease, or acid indigestion which are a few of the common terms used to describe digestive upset.
[24] Heavy water is -
A.
Monoterium oxide
B.
Polyterium oxide
C.
Deuterium oxide
D.
Trisium oxide
Ans:
Deuterium oxide
Explanation :
Heavy water (D2O) is also called deuterium oxide. It is water composed of deuterium, the hydrogen isotope with a mass double that of ordinary hydrogen, and oxygen.
[25] Mark the compound which possesses ionic, covalent and coordinate bonds.
A.
NH4Cl
B.
SO3
C.
SO2
D.
H2O
Ans:
NH4Cl
Explanation :
Ammonium chloride (NH4Cl) is generally considered as an ionic compound but this compound has three different types of bond.
Explanation :
The non-stick coating used mainly for coating cooking utensils is made using PTFE (polytetrafluoroeth- ylene) that is also known by the name Teflon. Teflon is an inert polymer with high thermal and chemical resistance. Besides, it is hydrophobic: neither water nor water-containing substances wet it and it has one of the lowest coefficients of friction of any solid.
[10] The least preferred technique in the disposal of Municipal Solid Waste is -
A.
Incineration
B.
Composting
C.
Land filling
D.
Bricketting
Ans:
Bricketting
Explanation :
Some of the methods of solid waste disposal and management are : • Open burning • Dumping into the sea • Sanitary Landfills • Incineration • Composting • Ploughing in fields • Hog feeding • Grinding and discharging into sewers • Salvaging • Fermentation and biological digestion Bricketting that involves the solidification of preprocessed municipal solid waste into fuel pellets or briquettes is the least preferred method of solid waste disposal.
[11] Which is the heaviest metal among the following?
A.
Gold
B.
Silver
C.
Iron
D.
Copper
Ans:
Gold
Explanation :
The heaviness of any metal is defined with reference to high densities, atomic weights, or atomic numbers. The atomic masses of the given elements are: Gold: 196.96654; Silver: 107.8682; Copper: 63.546; Iron: 55.847. So the heaviest metal is gold, followed by silver, copper and iron.
[12] Which of the following is a commercial source of energy?
A.
Agricultural waste
B.
Dried dung
C.
Sun
D.
Natural gas
Ans:
Natural gas
Explanation :
Energy is broadly classified as commercial and non-commercial energy. Firewood, agricultural waste (straw, etc.) and animals waste (cowdung) are the important components of non-commercial energy. Coal, petroleum products, natural gas and, electricity are the important components of commercial energy. These goods are largely used for commercial purposes in the factories and farms.
[13] Which of the following is used to make light weight, but strong plastic?
A.
Nylon
B.
Polythene
C.
Polyvinyl Chloride
D.
Methyl Methacrylate
Ans:
Polyvinyl Chloride
Explanation :
Polyvinyl chloride (PVC) is a common, strong but lightweight plastic that is used in making tough plastic. It is used for flexible applications such as insulating cables. It is the third-most widely produced synthetic plastic polymer, after polyethylene and polypropylene.
[14] Which gas emitted by power stations causes acid rain?
A.
Carbon dioxide
B.
Sulphur dioxide
C.
Helium
D.
Nitrogen
Ans:
Sulphur dioxide
Explanation :
Sulfur dioxide (SO2) and nitrogen oxides (NOx) are the principal pollutants that cause acid rain. SO2 and NOx emissions released to the air react with water vapor and other chemicals to form acids that fall back to Earth. Power plants burning coal and heavy oil produce over two-thirds of the annual SO2 emission.
[15] Heavy water is –
A.
Deuterium
B.
Rain water
C.
Tritium oxide
D.
Deuterium oxide
Ans:
Deuterium oxide
Explanation :
Heavy water is deuterium oxide (2H2O). It is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in normal water.
[16] Chemical composition of heavy water is –
A.
H2O2
B.
H2O
C.
HDO
D.
D2O
Ans:
D2O
Explanation :
The chemical composition of Heavy water (deuterium oxide) is 2H2O or D2O. It is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in regular water.
[17] The most abundant element is -
A.
Calcium
B.
Silicon
C.
Oxygen
D.
Nitrogen
Ans:
Oxygen
Explanation :
On earth, oxygen is the most common element, making up about 47% of the earth's mass. Silicon is second, making up 28%, followed by aluminum (8%), iron (5%), magnesium (2%), calcium (4%), sodium (3%), and potassium (3%). All of the remaining elements together make up less than 1% of the earth's mass.
[18] Aluminium salt commonly used to stop bleeding is -
A.
Aluminium nitrate
B.
Aluminium sulphate
C.
Aluminium Chloride
D.
Potash alum
Ans:
Aluminium sulphate
Explanation :
Alum (Aluminium Sulfate) is used to stop bleeding. For example, Styptic pencils containing aluminium sulfate are used as astringents to prevent bleeding from small shaving cuts. It constricts blood vessels to stop the flow of blood.
[19] Hydrochloric acid is also known as -
A.
Galic acid
B.
Picric acid
C.
Muriatic acid
D.
Chloric acid
Ans:
Muriatic acid
Explanation :
Hydrochloric acid was historically called acidum sails, muriatic acid, and spirits of salt because it was produced from rock salt and green vitriol and later from the chemically similar substances common salt and sulfuric acid. Hydrochloric acid is found naturally in gastric acid.
[20] The inert gas used as beacon light is -
A.
Kr
B.
Ar
C.
He
D.
Ne
Ans:
Ne
Explanation :
Neon is used in neon discharge lamps and advertising signs because the neon lights are visible from long distances. Since the light of neon signs has a better penetrating power through fog and mist, the neon signs are also used in beacon lights for the safety of air and sea navigation.
[21] Who proposed first atomic theory?
A.
E.Rutherford
B.
De Broglie
C.
John Dalton
D.
D.I.Mendeleef
Ans:
John Dalton
Explanation :
Democritus first suggested the existence of the atom but it took almost two millennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844).
[22] The ultrapure metal is obtained by -
A.
Calcination
B.
Sublimation
C.
zone refining
D.
None of these
Ans:
zone refining
Explanation :
The principal stages in the production of ultrapure metals are the preparation of pure chemical compounds, the reduction of the compounds to the elementary state and further purification.
[23] Antacids are found in drugs that give relief to -
A.
Eye sight
B.
Stomach ache
C.
Acne
D.
Headache
Ans:
Stomach ache
Explanation :
An antacid is a substance which neutralizes stomach acidity. Antacids are taken by mouth to relieve heartburn, the major symptom of gastro-esophageal reflux disease, or acid indigestion which are a few of the common terms used to describe digestive upset.
[24] Heavy water is -
A.
Monoterium oxide
B.
Polyterium oxide
C.
Deuterium oxide
D.
Trisium oxide
Ans:
Deuterium oxide
Explanation :
Heavy water (D2O) is also called deuterium oxide. It is water composed of deuterium, the hydrogen isotope with a mass double that of ordinary hydrogen, and oxygen.
[25] Mark the compound which possesses ionic, covalent and coordinate bonds.
A.
NH4Cl
B.
SO3
C.
SO2
D.
H2O
Ans:
NH4Cl
Explanation :
Ammonium chloride (NH4Cl) is generally considered as an ionic compound but this compound has three different types of bond.
Explanation :
The heaviness of any metal is defined with reference to high densities, atomic weights, or atomic numbers. The atomic masses of the given elements are: Gold: 196.96654; Silver: 107.8682; Copper: 63.546; Iron: 55.847. So the heaviest metal is gold, followed by silver, copper and iron.
[12] Which of the following is a commercial source of energy?
A.
Agricultural waste
B.
Dried dung
C.
Sun
D.
Natural gas
Ans:
Natural gas
Explanation :
Energy is broadly classified as commercial and non-commercial energy. Firewood, agricultural waste (straw, etc.) and animals waste (cowdung) are the important components of non-commercial energy. Coal, petroleum products, natural gas and, electricity are the important components of commercial energy. These goods are largely used for commercial purposes in the factories and farms.
[13] Which of the following is used to make light weight, but strong plastic?
A.
Nylon
B.
Polythene
C.
Polyvinyl Chloride
D.
Methyl Methacrylate
Ans:
Polyvinyl Chloride
Explanation :
Polyvinyl chloride (PVC) is a common, strong but lightweight plastic that is used in making tough plastic. It is used for flexible applications such as insulating cables. It is the third-most widely produced synthetic plastic polymer, after polyethylene and polypropylene.
[14] Which gas emitted by power stations causes acid rain?
A.
Carbon dioxide
B.
Sulphur dioxide
C.
Helium
D.
Nitrogen
Ans:
Sulphur dioxide
Explanation :
Sulfur dioxide (SO2) and nitrogen oxides (NOx) are the principal pollutants that cause acid rain. SO2 and NOx emissions released to the air react with water vapor and other chemicals to form acids that fall back to Earth. Power plants burning coal and heavy oil produce over two-thirds of the annual SO2 emission.
[15] Heavy water is –
A.
Deuterium
B.
Rain water
C.
Tritium oxide
D.
Deuterium oxide
Ans:
Deuterium oxide
Explanation :
Heavy water is deuterium oxide (2H2O). It is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in normal water.
[16] Chemical composition of heavy water is –
A.
H2O2
B.
H2O
C.
HDO
D.
D2O
Ans:
D2O
Explanation :
The chemical composition of Heavy water (deuterium oxide) is 2H2O or D2O. It is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in regular water.
[17] The most abundant element is -
A.
Calcium
B.
Silicon
C.
Oxygen
D.
Nitrogen
Ans:
Oxygen
Explanation :
On earth, oxygen is the most common element, making up about 47% of the earth's mass. Silicon is second, making up 28%, followed by aluminum (8%), iron (5%), magnesium (2%), calcium (4%), sodium (3%), and potassium (3%). All of the remaining elements together make up less than 1% of the earth's mass.
[18] Aluminium salt commonly used to stop bleeding is -
A.
Aluminium nitrate
B.
Aluminium sulphate
C.
Aluminium Chloride
D.
Potash alum
Ans:
Aluminium sulphate
Explanation :
Alum (Aluminium Sulfate) is used to stop bleeding. For example, Styptic pencils containing aluminium sulfate are used as astringents to prevent bleeding from small shaving cuts. It constricts blood vessels to stop the flow of blood.
[19] Hydrochloric acid is also known as -
A.
Galic acid
B.
Picric acid
C.
Muriatic acid
D.
Chloric acid
Ans:
Muriatic acid
Explanation :
Hydrochloric acid was historically called acidum sails, muriatic acid, and spirits of salt because it was produced from rock salt and green vitriol and later from the chemically similar substances common salt and sulfuric acid. Hydrochloric acid is found naturally in gastric acid.
[20] The inert gas used as beacon light is -
A.
Kr
B.
Ar
C.
He
D.
Ne
Ans:
Ne
Explanation :
Neon is used in neon discharge lamps and advertising signs because the neon lights are visible from long distances. Since the light of neon signs has a better penetrating power through fog and mist, the neon signs are also used in beacon lights for the safety of air and sea navigation.
[21] Who proposed first atomic theory?
A.
E.Rutherford
B.
De Broglie
C.
John Dalton
D.
D.I.Mendeleef
Ans:
John Dalton
Explanation :
Democritus first suggested the existence of the atom but it took almost two millennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844).
[22] The ultrapure metal is obtained by -
A.
Calcination
B.
Sublimation
C.
zone refining
D.
None of these
Ans:
zone refining
Explanation :
The principal stages in the production of ultrapure metals are the preparation of pure chemical compounds, the reduction of the compounds to the elementary state and further purification.
[23] Antacids are found in drugs that give relief to -
A.
Eye sight
B.
Stomach ache
C.
Acne
D.
Headache
Ans:
Stomach ache
Explanation :
An antacid is a substance which neutralizes stomach acidity. Antacids are taken by mouth to relieve heartburn, the major symptom of gastro-esophageal reflux disease, or acid indigestion which are a few of the common terms used to describe digestive upset.
[24] Heavy water is -
A.
Monoterium oxide
B.
Polyterium oxide
C.
Deuterium oxide
D.
Trisium oxide
Ans:
Deuterium oxide
Explanation :
Heavy water (D2O) is also called deuterium oxide. It is water composed of deuterium, the hydrogen isotope with a mass double that of ordinary hydrogen, and oxygen.
[25] Mark the compound which possesses ionic, covalent and coordinate bonds.
A.
NH4Cl
B.
SO3
C.
SO2
D.
H2O
Ans:
NH4Cl
Explanation :
Ammonium chloride (NH4Cl) is generally considered as an ionic compound but this compound has three different types of bond.
Explanation :
Polyvinyl chloride (PVC) is a common, strong but lightweight plastic that is used in making tough plastic. It is used for flexible applications such as insulating cables. It is the third-most widely produced synthetic plastic polymer, after polyethylene and polypropylene.
[14] Which gas emitted by power stations causes acid rain?
A.
Carbon dioxide
B.
Sulphur dioxide
C.
Helium
D.
Nitrogen
Ans:
Sulphur dioxide
Explanation :
Sulfur dioxide (SO2) and nitrogen oxides (NOx) are the principal pollutants that cause acid rain. SO2 and NOx emissions released to the air react with water vapor and other chemicals to form acids that fall back to Earth. Power plants burning coal and heavy oil produce over two-thirds of the annual SO2 emission.
[15] Heavy water is –
A.
Deuterium
B.
Rain water
C.
Tritium oxide
D.
Deuterium oxide
Ans:
Deuterium oxide
Explanation :
Heavy water is deuterium oxide (2H2O). It is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in normal water.
[16] Chemical composition of heavy water is –
A.
H2O2
B.
H2O
C.
HDO
D.
D2O
Ans:
D2O
Explanation :
The chemical composition of Heavy water (deuterium oxide) is 2H2O or D2O. It is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in regular water.
[17] The most abundant element is -
A.
Calcium
B.
Silicon
C.
Oxygen
D.
Nitrogen
Ans:
Oxygen
Explanation :
On earth, oxygen is the most common element, making up about 47% of the earth's mass. Silicon is second, making up 28%, followed by aluminum (8%), iron (5%), magnesium (2%), calcium (4%), sodium (3%), and potassium (3%). All of the remaining elements together make up less than 1% of the earth's mass.
[18] Aluminium salt commonly used to stop bleeding is -
A.
Aluminium nitrate
B.
Aluminium sulphate
C.
Aluminium Chloride
D.
Potash alum
Ans:
Aluminium sulphate
Explanation :
Alum (Aluminium Sulfate) is used to stop bleeding. For example, Styptic pencils containing aluminium sulfate are used as astringents to prevent bleeding from small shaving cuts. It constricts blood vessels to stop the flow of blood.
[19] Hydrochloric acid is also known as -
A.
Galic acid
B.
Picric acid
C.
Muriatic acid
D.
Chloric acid
Ans:
Muriatic acid
Explanation :
Hydrochloric acid was historically called acidum sails, muriatic acid, and spirits of salt because it was produced from rock salt and green vitriol and later from the chemically similar substances common salt and sulfuric acid. Hydrochloric acid is found naturally in gastric acid.
[20] The inert gas used as beacon light is -
A.
Kr
B.
Ar
C.
He
D.
Ne
Ans:
Ne
Explanation :
Neon is used in neon discharge lamps and advertising signs because the neon lights are visible from long distances. Since the light of neon signs has a better penetrating power through fog and mist, the neon signs are also used in beacon lights for the safety of air and sea navigation.
[21] Who proposed first atomic theory?
A.
E.Rutherford
B.
De Broglie
C.
John Dalton
D.
D.I.Mendeleef
Ans:
John Dalton
Explanation :
Democritus first suggested the existence of the atom but it took almost two millennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844).
[22] The ultrapure metal is obtained by -
A.
Calcination
B.
Sublimation
C.
zone refining
D.
None of these
Ans:
zone refining
Explanation :
The principal stages in the production of ultrapure metals are the preparation of pure chemical compounds, the reduction of the compounds to the elementary state and further purification.
[23] Antacids are found in drugs that give relief to -
A.
Eye sight
B.
Stomach ache
C.
Acne
D.
Headache
Ans:
Stomach ache
Explanation :
An antacid is a substance which neutralizes stomach acidity. Antacids are taken by mouth to relieve heartburn, the major symptom of gastro-esophageal reflux disease, or acid indigestion which are a few of the common terms used to describe digestive upset.
[24] Heavy water is -
A.
Monoterium oxide
B.
Polyterium oxide
C.
Deuterium oxide
D.
Trisium oxide
Ans:
Deuterium oxide
Explanation :
Heavy water (D2O) is also called deuterium oxide. It is water composed of deuterium, the hydrogen isotope with a mass double that of ordinary hydrogen, and oxygen.
[25] Mark the compound which possesses ionic, covalent and coordinate bonds.
A.
NH4Cl
B.
SO3
C.
SO2
D.
H2O
Ans:
NH4Cl
Explanation :
Ammonium chloride (NH4Cl) is generally considered as an ionic compound but this compound has three different types of bond.
Explanation :
Heavy water is deuterium oxide (2H2O). It is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in normal water.
[16] Chemical composition of heavy water is –
A.
H2O2
B.
H2O
C.
HDO
D.
D2O
Ans:
D2O
Explanation :
The chemical composition of Heavy water (deuterium oxide) is 2H2O or D2O. It is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in regular water.
[17] The most abundant element is -
A.
Calcium
B.
Silicon
C.
Oxygen
D.
Nitrogen
Ans:
Oxygen
Explanation :
On earth, oxygen is the most common element, making up about 47% of the earth's mass. Silicon is second, making up 28%, followed by aluminum (8%), iron (5%), magnesium (2%), calcium (4%), sodium (3%), and potassium (3%). All of the remaining elements together make up less than 1% of the earth's mass.
[18] Aluminium salt commonly used to stop bleeding is -
A.
Aluminium nitrate
B.
Aluminium sulphate
C.
Aluminium Chloride
D.
Potash alum
Ans:
Aluminium sulphate
Explanation :
Alum (Aluminium Sulfate) is used to stop bleeding. For example, Styptic pencils containing aluminium sulfate are used as astringents to prevent bleeding from small shaving cuts. It constricts blood vessels to stop the flow of blood.
[19] Hydrochloric acid is also known as -
A.
Galic acid
B.
Picric acid
C.
Muriatic acid
D.
Chloric acid
Ans:
Muriatic acid
Explanation :
Hydrochloric acid was historically called acidum sails, muriatic acid, and spirits of salt because it was produced from rock salt and green vitriol and later from the chemically similar substances common salt and sulfuric acid. Hydrochloric acid is found naturally in gastric acid.
[20] The inert gas used as beacon light is -
A.
Kr
B.
Ar
C.
He
D.
Ne
Ans:
Ne
Explanation :
Neon is used in neon discharge lamps and advertising signs because the neon lights are visible from long distances. Since the light of neon signs has a better penetrating power through fog and mist, the neon signs are also used in beacon lights for the safety of air and sea navigation.
[21] Who proposed first atomic theory?
A.
E.Rutherford
B.
De Broglie
C.
John Dalton
D.
D.I.Mendeleef
Ans:
John Dalton
Explanation :
Democritus first suggested the existence of the atom but it took almost two millennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844).
[22] The ultrapure metal is obtained by -
A.
Calcination
B.
Sublimation
C.
zone refining
D.
None of these
Ans:
zone refining
Explanation :
The principal stages in the production of ultrapure metals are the preparation of pure chemical compounds, the reduction of the compounds to the elementary state and further purification.
[23] Antacids are found in drugs that give relief to -
A.
Eye sight
B.
Stomach ache
C.
Acne
D.
Headache
Ans:
Stomach ache
Explanation :
An antacid is a substance which neutralizes stomach acidity. Antacids are taken by mouth to relieve heartburn, the major symptom of gastro-esophageal reflux disease, or acid indigestion which are a few of the common terms used to describe digestive upset.
[24] Heavy water is -
A.
Monoterium oxide
B.
Polyterium oxide
C.
Deuterium oxide
D.
Trisium oxide
Ans:
Deuterium oxide
Explanation :
Heavy water (D2O) is also called deuterium oxide. It is water composed of deuterium, the hydrogen isotope with a mass double that of ordinary hydrogen, and oxygen.
[25] Mark the compound which possesses ionic, covalent and coordinate bonds.
A.
NH4Cl
B.
SO3
C.
SO2
D.
H2O
Ans:
NH4Cl
Explanation :
Ammonium chloride (NH4Cl) is generally considered as an ionic compound but this compound has three different types of bond.
Explanation :
On earth, oxygen is the most common element, making up about 47% of the earth's mass. Silicon is second, making up 28%, followed by aluminum (8%), iron (5%), magnesium (2%), calcium (4%), sodium (3%), and potassium (3%). All of the remaining elements together make up less than 1% of the earth's mass.
[18] Aluminium salt commonly used to stop bleeding is -
A.
Aluminium nitrate
B.
Aluminium sulphate
C.
Aluminium Chloride
D.
Potash alum
Ans:
Aluminium sulphate
Explanation :
Alum (Aluminium Sulfate) is used to stop bleeding. For example, Styptic pencils containing aluminium sulfate are used as astringents to prevent bleeding from small shaving cuts. It constricts blood vessels to stop the flow of blood.
[19] Hydrochloric acid is also known as -
A.
Galic acid
B.
Picric acid
C.
Muriatic acid
D.
Chloric acid
Ans:
Muriatic acid
Explanation :
Hydrochloric acid was historically called acidum sails, muriatic acid, and spirits of salt because it was produced from rock salt and green vitriol and later from the chemically similar substances common salt and sulfuric acid. Hydrochloric acid is found naturally in gastric acid.
[20] The inert gas used as beacon light is -
A.
Kr
B.
Ar
C.
He
D.
Ne
Ans:
Ne
Explanation :
Neon is used in neon discharge lamps and advertising signs because the neon lights are visible from long distances. Since the light of neon signs has a better penetrating power through fog and mist, the neon signs are also used in beacon lights for the safety of air and sea navigation.
[21] Who proposed first atomic theory?
A.
E.Rutherford
B.
De Broglie
C.
John Dalton
D.
D.I.Mendeleef
Ans:
John Dalton
Explanation :
Democritus first suggested the existence of the atom but it took almost two millennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844).
[22] The ultrapure metal is obtained by -
A.
Calcination
B.
Sublimation
C.
zone refining
D.
None of these
Ans:
zone refining
Explanation :
The principal stages in the production of ultrapure metals are the preparation of pure chemical compounds, the reduction of the compounds to the elementary state and further purification.
[23] Antacids are found in drugs that give relief to -
A.
Eye sight
B.
Stomach ache
C.
Acne
D.
Headache
Ans:
Stomach ache
Explanation :
An antacid is a substance which neutralizes stomach acidity. Antacids are taken by mouth to relieve heartburn, the major symptom of gastro-esophageal reflux disease, or acid indigestion which are a few of the common terms used to describe digestive upset.
[24] Heavy water is -
A.
Monoterium oxide
B.
Polyterium oxide
C.
Deuterium oxide
D.
Trisium oxide
Ans:
Deuterium oxide
Explanation :
Heavy water (D2O) is also called deuterium oxide. It is water composed of deuterium, the hydrogen isotope with a mass double that of ordinary hydrogen, and oxygen.
[25] Mark the compound which possesses ionic, covalent and coordinate bonds.
A.
NH4Cl
B.
SO3
C.
SO2
D.
H2O
Ans:
NH4Cl
Explanation :
Ammonium chloride (NH4Cl) is generally considered as an ionic compound but this compound has three different types of bond.
Explanation :
Hydrochloric acid was historically called acidum sails, muriatic acid, and spirits of salt because it was produced from rock salt and green vitriol and later from the chemically similar substances common salt and sulfuric acid. Hydrochloric acid is found naturally in gastric acid.
[20] The inert gas used as beacon light is -
A.
Kr
B.
Ar
C.
He
D.
Ne
Ans:
Ne
Explanation :
Neon is used in neon discharge lamps and advertising signs because the neon lights are visible from long distances. Since the light of neon signs has a better penetrating power through fog and mist, the neon signs are also used in beacon lights for the safety of air and sea navigation.
[21] Who proposed first atomic theory?
A.
E.Rutherford
B.
De Broglie
C.
John Dalton
D.
D.I.Mendeleef
Ans:
John Dalton
Explanation :
Democritus first suggested the existence of the atom but it took almost two millennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844).
[22] The ultrapure metal is obtained by -
A.
Calcination
B.
Sublimation
C.
zone refining
D.
None of these
Ans:
zone refining
Explanation :
The principal stages in the production of ultrapure metals are the preparation of pure chemical compounds, the reduction of the compounds to the elementary state and further purification.
[23] Antacids are found in drugs that give relief to -
A.
Eye sight
B.
Stomach ache
C.
Acne
D.
Headache
Ans:
Stomach ache
Explanation :
An antacid is a substance which neutralizes stomach acidity. Antacids are taken by mouth to relieve heartburn, the major symptom of gastro-esophageal reflux disease, or acid indigestion which are a few of the common terms used to describe digestive upset.
[24] Heavy water is -
A.
Monoterium oxide
B.
Polyterium oxide
C.
Deuterium oxide
D.
Trisium oxide
Ans:
Deuterium oxide
Explanation :
Heavy water (D2O) is also called deuterium oxide. It is water composed of deuterium, the hydrogen isotope with a mass double that of ordinary hydrogen, and oxygen.
[25] Mark the compound which possesses ionic, covalent and coordinate bonds.
A.
NH4Cl
B.
SO3
C.
SO2
D.
H2O
Ans:
NH4Cl
Explanation :
Ammonium chloride (NH4Cl) is generally considered as an ionic compound but this compound has three different types of bond.
Explanation :
Democritus first suggested the existence of the atom but it took almost two millennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844).
[22] The ultrapure metal is obtained by -
A.
Calcination
B.
Sublimation
C.
zone refining
D.
None of these
Ans:
zone refining
Explanation :
The principal stages in the production of ultrapure metals are the preparation of pure chemical compounds, the reduction of the compounds to the elementary state and further purification.
[23] Antacids are found in drugs that give relief to -
A.
Eye sight
B.
Stomach ache
C.
Acne
D.
Headache
Ans:
Stomach ache
Explanation :
An antacid is a substance which neutralizes stomach acidity. Antacids are taken by mouth to relieve heartburn, the major symptom of gastro-esophageal reflux disease, or acid indigestion which are a few of the common terms used to describe digestive upset.
[24] Heavy water is -
A.
Monoterium oxide
B.
Polyterium oxide
C.
Deuterium oxide
D.
Trisium oxide
Ans:
Deuterium oxide
Explanation :
Heavy water (D2O) is also called deuterium oxide. It is water composed of deuterium, the hydrogen isotope with a mass double that of ordinary hydrogen, and oxygen.
[25] Mark the compound which possesses ionic, covalent and coordinate bonds.
A.
NH4Cl
B.
SO3
C.
SO2
D.
H2O
Ans:
NH4Cl
Explanation :
Ammonium chloride (NH4Cl) is generally considered as an ionic compound but this compound has three different types of bond.
Explanation :
An antacid is a substance which neutralizes stomach acidity. Antacids are taken by mouth to relieve heartburn, the major symptom of gastro-esophageal reflux disease, or acid indigestion which are a few of the common terms used to describe digestive upset.
[24] Heavy water is -
A.
Monoterium oxide
B.
Polyterium oxide
C.
Deuterium oxide
D.
Trisium oxide
Ans:
Deuterium oxide
Explanation :
Heavy water (D2O) is also called deuterium oxide. It is water composed of deuterium, the hydrogen isotope with a mass double that of ordinary hydrogen, and oxygen.
[25] Mark the compound which possesses ionic, covalent and coordinate bonds.
A.
NH4Cl
B.
SO3
C.
SO2
D.
H2O
Ans:
NH4Cl
Explanation :
Ammonium chloride (NH4Cl) is generally considered as an ionic compound but this compound has three different types of bond.
Explanation :
Ammonium chloride (NH4Cl) is generally considered as an ionic compound but this compound has three different types of bond.