[1] Diamond is the form of carbon that is -
A.
Crystalline
B.
Amorphous
C.
Chemical
D.
Alkaline
Ans:
Crystalline
Explanation :
Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic.
[2] Which of the following does not give benzoic acid on hydrolysis?
A.
phenyl cyanide
B.
benzoyl chloride
C.
benzyl chloride
D.
methyl benzoate
Ans:
benzyl chloride
Explanation :
Hydrolysis is any chemical reaction in which a molecule of water ruptures one or more chemical bonds.
[3] Which of the following gases is known as “Laughing Gas”?
A.
Nitrous oxide
B.
Nitrogen peroxide
C.
Nitrogen
D.
Nitric oxide
Ans:
Nitrous oxide
Explanation :
Nitrous oxide (N2O) is commonly known as laughing gas. It is used in surgery and dentistry for its anaesthetic and analgesic effects. It is known as "laughing gas" due to the euphoric effects of inhaling it, a property that has led to its recreational use as a dissociative anaesthetic.
[4] Inert gases are -
A.
Miscible with water
B.
Not stable
C.
Chemically uncreative
D.
Chemically very active
Ans:
Chemically uncreative
Explanation :
An inert gas is a gas which does not undergo chemical reactions since their valence shells are filled, meaning they don't normally form chemical bonds with other elements. They are extremely stable; they rarely gain, lose or share electrons. The inert gases, also called noble gases, are argon, helium, neon, krypton, xenon and radon.
[5] The metallic constituents of hard water are -
A.
Magnesium, Calcium and tin
B.
Iron, tin and calcium
C.
Calcium, magnesium and iron
D.
Magnesium, tin and iron
Ans:
Calcium, magnesium and iron
Explanation :
Hard water is water that has high mineral content (in contrast with "soft water"). Hard water is formed whenwater percolates through deposits of limestone and chalk which are largely made up of calcium and magnesium carbonates.
[6] Ruby and sapphire are oxides of -
A.
capper
B.
tin
C.
iron
D.
aluminium
Ans:
aluminium
Explanation :
Aluminium forms one stable oxide, known by its mineral name corundum. Sapphire and ruby are impure corundum contaminated with trace amounts of other metals. Corundum is a crystalline form of aluminium oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the naturally clear transparent materials, but can have different colours when impurities are present. Transparent specimens are used as gems, called ruby if red and padparadscha if pink-orange. All other colours are called sapphire, e.g., “green sapphire” for a green specimen. Because of corundum’s hardness (pure corundum is defined to have 9.0 Mohs), it can scratch almost every other mineral. It is commonly used as an abrasive, on everything from sandpaper to large machines used in machining metals, plastics, and wood. Some emery is a mix of corundum and other substances, and the mix is less abrasive, with an average hardness near 8.0.
[7] Water has maximum density at –
A.
-4°C
B.
0°C
C.
4°C
D.
100°C
Ans:
4°C
Explanation :
When cooled from room temperature liquid water becomes increasingly dense, as with other substances, but at approximately 4 °C (39 °F), pure water reaches its maximum density.
[8] gives hardness to stainless steel.
A.
Zinc
B.
Lead
C.
Carbon
D.
Tin
Ans:
Carbon
Explanation :
Iron is alloyed with carbon to make steel and has the effect of increasing the hardness and strength of iron.
[9] The ‘solid waste’ is also known as -
A.
Sedge
B.
Toxic waste
C.
Sludge
D.
Scrubber
Ans:
Sludge
Explanation :
Solid waste, also known as sludge, refers to the residual, semi-solid material that is produced as a by- product during sewage treatment of industrial or municipal wastewater. It mainly results from manufacturing process such as that of factories, industries, mills, and mining operations.
[10] Which of the following has pH value 7?
A.
Pure Water
B.
H2SO4
C.
Sodium Carbonate
D.
HCl
Ans:
Pure Water
Explanation :
In chemistry, pH is a numeric scale used to specify the acidity or basicity of an aqueous solution. Solutions with a pH less than 7 are acidic and solutions with a pH greater than 7 are basic. Pure water is neutral, being neither an acid nor basic; so it has pH value of 7.
[11] Chemical name of vinegar is -
A.
Acetone
B.
Acetic acid
C.
Formaldehyde
D.
Ethanol
Ans:
Acetic acid
Explanation :
Vinegar is roughly 3-9% acetic acid CH3COOH) by volume, making acetic acid the main component of vinegar apart from water. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. Vinegar is mainly used as a cooking ingredient, or in pickling.
[12] Mercury is a –
A.
solid metal
B.
liquid metal
C.
solid non-metal
D.
liquid non-metal
Ans:
liquid metal
Explanation :
A heavy, silvery d-block element, Mercury is the only metal that is liquid at standard conditions for temperature and pressure; the only other element that is liquid under these conditions is bromine. With a freezing point of -38.83 °C and boiling point of 356.73 °C, mercury has one of the narrowest ranges of its liquid state of any metal.
[13] Spirit in contact with body gives cool sensation because it is –
A.
liquid
B.
transparent
C.
highly volatile
D.
a good conductor
Ans:
highly volatile
Explanation :
Spirit is very volatile. So when it is exposed, it evaporates rapidly to the air if released into the environment, producing a cool effect.
[14] Natural rubber is the polymer of :
A.
Isoprene
B.
Styrene
C.
Butadiene
D.
Ethylene
Ans:
Isoprene
Explanation :
Isoprene was first isolated by thermal decomposition of natural rubber. About 95% of isoprene production is used to produce cis-1,4- polyisoprene—a synthetic version of natural rubber.
[15] In addition to hydrogen, the other abundant element present on Sun’s surface is -
A.
Helium
B.
Neon
C.
Argon
D.
Oxygen
Ans:
Helium
Explanation :
The Sun is composed primarily of the chemical elements hydrogen and helium; they account for 74.9% and 23.8% of the mass of the Sun in the photosphere, respectively. All heavier elements, called metals in astronomy, account for less than 2% of the mass. The Sun inherited its chemical composition from the interstellar medium out of which it formed: the hydrogen and helium in the Sun were produced by Big Bang nucleosynthesis.
[16] If lime water is kept in the air, it turns milky due to presence of –
A.
Carbondioxide
B.
Nitrogen
C.
Oxygen
D.
Sulphurdioxide
Ans:
Carbondioxide
Explanation :
Lime water is calcium hydroxide (Ca(OH)2). When carbon dioxide is passed into it, it turns milky because of the formation of calcium carbonate: Ca(OH)2 + CO2 = CaCO3 +H2O
[17] Heavy metal pollution of water is caused by:
A.
Paints
B.
Wood burning
C.
Acid Plants
D.
Domestic sewage
Ans:
Paints
Explanation :
Heavy metals (cadmium, cobalt, chromium, copper, mercury, manganese, nickel, lead, zinc, molybdenum, tin) are among the main pollutants. Industrial paints are loaded with metals such as lead, calcium, cadmium and other such chemicals, When any amount of paint is led off into the water bodies it causes water pollution by causing the amount of heavy metals present in water to fluctuate, Each one of these has severe toxic effects on living beings, and tend to accumulate in aquatic food chains.
[18] Nitrogen forms a variety of compounds in all oxidation states ranging from -
A.
-3 to + 5
B.
-3 to +3
C.
-3 to + 4
D.
-3 to +6
Ans:
-3 to + 5
Explanation :
Nitrogen compounds are chemical compounds containing nitrogen ions. Nitrogen forms compounds with a wide range of oxidation states that range from -3 for the nitride ion to in nitrates and nitric acid. +5 oxidation state compounds are strong oxidizing agents. -3 oxidation state compounds are weak reducing agents.
[19] The next higher homologue of C6H14 is -
A.
C6H14
B.
C7H12
C.
C6H12
D.
C7H16
Ans:
C7H16
Explanation :
In chemistry, a homologous series is a series of compounds with a similar general formula, possessing similar chemical properties due to the presence of the same functional group. C6H14 stands for Hexane which is an alkane with six carbon atoms. In the alkane homologous series, each member differs from the previous one by a CH2 group (or 14 atomic mass units). The CH2 group is called Methylene Group. So the higher homologue of Hexane is Heptane (C7H16).
[20] Biogas majorly contains -
A.
Ethane
B.
Methane
C.
Hydrogen
D.
CO
Ans:
Methane
Explanation :
Biogas is a mixture of different gases, major portion in biogas being methane (CH4) and carbon dioxide (CO2). It also contains traces of other gases like hydrogen (H2), Moisture (H2O) , hydrogen sulfide (H2S) etc.
[21] The sewage obtained from water closets and urinals is known as –
A.
Sanitary waste
B.
Industrial waste
C.
Garbage
D.
Sullage
Ans:
Sanitary waste
Explanation :
The sewage obtained from water closets and urinals in known as Sanitary waste.
[22] In organic compounds, nitrogen is estimated by –
A.
Carius method
B.
Victor-Meyees method
C.
Liebigs method
D.
Dumas' method
Ans:
Dumas' method
Explanation :
In Dumas' method, a known quantity of nitrogen containing organic compound is heated strongly with excess of copper oxide in an atmosphere of carbon dioxide to produce free nitrogen in addition to carbon dioxide and water.
[23] The hottest part of the gas flame is known as –
A.
blue zone
B.
non-luminous zone
C.
luminous zone
D.
dark zone
Ans:
luminous zone
Explanation :
The hottest part of the gas flame is known as luminous zone.
[24] What is dry ice?
A.
Solid Carbon dioxide
B.
Solid Nitrogen dioxide
C.
Solid Sulphur dioxide
D.
Solid Water
Ans:
Solid Carbon dioxide
Explanation :
Dry ice, sometimes referred to as "cardice," is the solid form of carbon dioxide. Its advantages include lower temperature than that of water ice and not leaving any residue (other than incidental frost from moisture in the atmosphere).
[25] Nail polish remover contains?
A.
benzene
B.
acetic acid
C.
acetone
D.
petroleum ether
Ans:
petroleum ether
Explanation :
Acetone can remove artificial nails made of acrylic or cured gel. A less harsh nail polish remover is ethyl acetate, which often also contains isopropyl alcohol. Ethyl acetate is usually the original solvent for nail polish itself.
Explanation :
Diamond is a solid form of the element carbon with its atoms arranged in a crystal structure called diamond cubic.
[2] Which of the following does not give benzoic acid on hydrolysis?
A.
phenyl cyanide
B.
benzoyl chloride
C.
benzyl chloride
D.
methyl benzoate
Ans:
benzyl chloride
Explanation :
Hydrolysis is any chemical reaction in which a molecule of water ruptures one or more chemical bonds.
[3] Which of the following gases is known as “Laughing Gas”?
A.
Nitrous oxide
B.
Nitrogen peroxide
C.
Nitrogen
D.
Nitric oxide
Ans:
Nitrous oxide
Explanation :
Nitrous oxide (N2O) is commonly known as laughing gas. It is used in surgery and dentistry for its anaesthetic and analgesic effects. It is known as "laughing gas" due to the euphoric effects of inhaling it, a property that has led to its recreational use as a dissociative anaesthetic.
[4] Inert gases are -
A.
Miscible with water
B.
Not stable
C.
Chemically uncreative
D.
Chemically very active
Ans:
Chemically uncreative
Explanation :
An inert gas is a gas which does not undergo chemical reactions since their valence shells are filled, meaning they don't normally form chemical bonds with other elements. They are extremely stable; they rarely gain, lose or share electrons. The inert gases, also called noble gases, are argon, helium, neon, krypton, xenon and radon.
[5] The metallic constituents of hard water are -
A.
Magnesium, Calcium and tin
B.
Iron, tin and calcium
C.
Calcium, magnesium and iron
D.
Magnesium, tin and iron
Ans:
Calcium, magnesium and iron
Explanation :
Hard water is water that has high mineral content (in contrast with "soft water"). Hard water is formed whenwater percolates through deposits of limestone and chalk which are largely made up of calcium and magnesium carbonates.
[6] Ruby and sapphire are oxides of -
A.
capper
B.
tin
C.
iron
D.
aluminium
Ans:
aluminium
Explanation :
Aluminium forms one stable oxide, known by its mineral name corundum. Sapphire and ruby are impure corundum contaminated with trace amounts of other metals. Corundum is a crystalline form of aluminium oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the naturally clear transparent materials, but can have different colours when impurities are present. Transparent specimens are used as gems, called ruby if red and padparadscha if pink-orange. All other colours are called sapphire, e.g., “green sapphire” for a green specimen. Because of corundum’s hardness (pure corundum is defined to have 9.0 Mohs), it can scratch almost every other mineral. It is commonly used as an abrasive, on everything from sandpaper to large machines used in machining metals, plastics, and wood. Some emery is a mix of corundum and other substances, and the mix is less abrasive, with an average hardness near 8.0.
[7] Water has maximum density at –
A.
-4°C
B.
0°C
C.
4°C
D.
100°C
Ans:
4°C
Explanation :
When cooled from room temperature liquid water becomes increasingly dense, as with other substances, but at approximately 4 °C (39 °F), pure water reaches its maximum density.
[8] gives hardness to stainless steel.
A.
Zinc
B.
Lead
C.
Carbon
D.
Tin
Ans:
Carbon
Explanation :
Iron is alloyed with carbon to make steel and has the effect of increasing the hardness and strength of iron.
[9] The ‘solid waste’ is also known as -
A.
Sedge
B.
Toxic waste
C.
Sludge
D.
Scrubber
Ans:
Sludge
Explanation :
Solid waste, also known as sludge, refers to the residual, semi-solid material that is produced as a by- product during sewage treatment of industrial or municipal wastewater. It mainly results from manufacturing process such as that of factories, industries, mills, and mining operations.
[10] Which of the following has pH value 7?
A.
Pure Water
B.
H2SO4
C.
Sodium Carbonate
D.
HCl
Ans:
Pure Water
Explanation :
In chemistry, pH is a numeric scale used to specify the acidity or basicity of an aqueous solution. Solutions with a pH less than 7 are acidic and solutions with a pH greater than 7 are basic. Pure water is neutral, being neither an acid nor basic; so it has pH value of 7.
[11] Chemical name of vinegar is -
A.
Acetone
B.
Acetic acid
C.
Formaldehyde
D.
Ethanol
Ans:
Acetic acid
Explanation :
Vinegar is roughly 3-9% acetic acid CH3COOH) by volume, making acetic acid the main component of vinegar apart from water. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. Vinegar is mainly used as a cooking ingredient, or in pickling.
[12] Mercury is a –
A.
solid metal
B.
liquid metal
C.
solid non-metal
D.
liquid non-metal
Ans:
liquid metal
Explanation :
A heavy, silvery d-block element, Mercury is the only metal that is liquid at standard conditions for temperature and pressure; the only other element that is liquid under these conditions is bromine. With a freezing point of -38.83 °C and boiling point of 356.73 °C, mercury has one of the narrowest ranges of its liquid state of any metal.
[13] Spirit in contact with body gives cool sensation because it is –
A.
liquid
B.
transparent
C.
highly volatile
D.
a good conductor
Ans:
highly volatile
Explanation :
Spirit is very volatile. So when it is exposed, it evaporates rapidly to the air if released into the environment, producing a cool effect.
[14] Natural rubber is the polymer of :
A.
Isoprene
B.
Styrene
C.
Butadiene
D.
Ethylene
Ans:
Isoprene
Explanation :
Isoprene was first isolated by thermal decomposition of natural rubber. About 95% of isoprene production is used to produce cis-1,4- polyisoprene—a synthetic version of natural rubber.
[15] In addition to hydrogen, the other abundant element present on Sun’s surface is -
A.
Helium
B.
Neon
C.
Argon
D.
Oxygen
Ans:
Helium
Explanation :
The Sun is composed primarily of the chemical elements hydrogen and helium; they account for 74.9% and 23.8% of the mass of the Sun in the photosphere, respectively. All heavier elements, called metals in astronomy, account for less than 2% of the mass. The Sun inherited its chemical composition from the interstellar medium out of which it formed: the hydrogen and helium in the Sun were produced by Big Bang nucleosynthesis.
[16] If lime water is kept in the air, it turns milky due to presence of –
A.
Carbondioxide
B.
Nitrogen
C.
Oxygen
D.
Sulphurdioxide
Ans:
Carbondioxide
Explanation :
Lime water is calcium hydroxide (Ca(OH)2). When carbon dioxide is passed into it, it turns milky because of the formation of calcium carbonate: Ca(OH)2 + CO2 = CaCO3 +H2O
[17] Heavy metal pollution of water is caused by:
A.
Paints
B.
Wood burning
C.
Acid Plants
D.
Domestic sewage
Ans:
Paints
Explanation :
Heavy metals (cadmium, cobalt, chromium, copper, mercury, manganese, nickel, lead, zinc, molybdenum, tin) are among the main pollutants. Industrial paints are loaded with metals such as lead, calcium, cadmium and other such chemicals, When any amount of paint is led off into the water bodies it causes water pollution by causing the amount of heavy metals present in water to fluctuate, Each one of these has severe toxic effects on living beings, and tend to accumulate in aquatic food chains.
[18] Nitrogen forms a variety of compounds in all oxidation states ranging from -
A.
-3 to + 5
B.
-3 to +3
C.
-3 to + 4
D.
-3 to +6
Ans:
-3 to + 5
Explanation :
Nitrogen compounds are chemical compounds containing nitrogen ions. Nitrogen forms compounds with a wide range of oxidation states that range from -3 for the nitride ion to in nitrates and nitric acid. +5 oxidation state compounds are strong oxidizing agents. -3 oxidation state compounds are weak reducing agents.
[19] The next higher homologue of C6H14 is -
A.
C6H14
B.
C7H12
C.
C6H12
D.
C7H16
Ans:
C7H16
Explanation :
In chemistry, a homologous series is a series of compounds with a similar general formula, possessing similar chemical properties due to the presence of the same functional group. C6H14 stands for Hexane which is an alkane with six carbon atoms. In the alkane homologous series, each member differs from the previous one by a CH2 group (or 14 atomic mass units). The CH2 group is called Methylene Group. So the higher homologue of Hexane is Heptane (C7H16).
[20] Biogas majorly contains -
A.
Ethane
B.
Methane
C.
Hydrogen
D.
CO
Ans:
Methane
Explanation :
Biogas is a mixture of different gases, major portion in biogas being methane (CH4) and carbon dioxide (CO2). It also contains traces of other gases like hydrogen (H2), Moisture (H2O) , hydrogen sulfide (H2S) etc.
[21] The sewage obtained from water closets and urinals is known as –
A.
Sanitary waste
B.
Industrial waste
C.
Garbage
D.
Sullage
Ans:
Sanitary waste
Explanation :
The sewage obtained from water closets and urinals in known as Sanitary waste.
[22] In organic compounds, nitrogen is estimated by –
A.
Carius method
B.
Victor-Meyees method
C.
Liebigs method
D.
Dumas' method
Ans:
Dumas' method
Explanation :
In Dumas' method, a known quantity of nitrogen containing organic compound is heated strongly with excess of copper oxide in an atmosphere of carbon dioxide to produce free nitrogen in addition to carbon dioxide and water.
[23] The hottest part of the gas flame is known as –
A.
blue zone
B.
non-luminous zone
C.
luminous zone
D.
dark zone
Ans:
luminous zone
Explanation :
The hottest part of the gas flame is known as luminous zone.
[24] What is dry ice?
A.
Solid Carbon dioxide
B.
Solid Nitrogen dioxide
C.
Solid Sulphur dioxide
D.
Solid Water
Ans:
Solid Carbon dioxide
Explanation :
Dry ice, sometimes referred to as "cardice," is the solid form of carbon dioxide. Its advantages include lower temperature than that of water ice and not leaving any residue (other than incidental frost from moisture in the atmosphere).
[25] Nail polish remover contains?
A.
benzene
B.
acetic acid
C.
acetone
D.
petroleum ether
Ans:
petroleum ether
Explanation :
Acetone can remove artificial nails made of acrylic or cured gel. A less harsh nail polish remover is ethyl acetate, which often also contains isopropyl alcohol. Ethyl acetate is usually the original solvent for nail polish itself.
Explanation :
Nitrous oxide (N2O) is commonly known as laughing gas. It is used in surgery and dentistry for its anaesthetic and analgesic effects. It is known as "laughing gas" due to the euphoric effects of inhaling it, a property that has led to its recreational use as a dissociative anaesthetic.
[4] Inert gases are -
A.
Miscible with water
B.
Not stable
C.
Chemically uncreative
D.
Chemically very active
Ans:
Chemically uncreative
Explanation :
An inert gas is a gas which does not undergo chemical reactions since their valence shells are filled, meaning they don't normally form chemical bonds with other elements. They are extremely stable; they rarely gain, lose or share electrons. The inert gases, also called noble gases, are argon, helium, neon, krypton, xenon and radon.
[5] The metallic constituents of hard water are -
A.
Magnesium, Calcium and tin
B.
Iron, tin and calcium
C.
Calcium, magnesium and iron
D.
Magnesium, tin and iron
Ans:
Calcium, magnesium and iron
Explanation :
Hard water is water that has high mineral content (in contrast with "soft water"). Hard water is formed whenwater percolates through deposits of limestone and chalk which are largely made up of calcium and magnesium carbonates.
[6] Ruby and sapphire are oxides of -
A.
capper
B.
tin
C.
iron
D.
aluminium
Ans:
aluminium
Explanation :
Aluminium forms one stable oxide, known by its mineral name corundum. Sapphire and ruby are impure corundum contaminated with trace amounts of other metals. Corundum is a crystalline form of aluminium oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the naturally clear transparent materials, but can have different colours when impurities are present. Transparent specimens are used as gems, called ruby if red and padparadscha if pink-orange. All other colours are called sapphire, e.g., “green sapphire” for a green specimen. Because of corundum’s hardness (pure corundum is defined to have 9.0 Mohs), it can scratch almost every other mineral. It is commonly used as an abrasive, on everything from sandpaper to large machines used in machining metals, plastics, and wood. Some emery is a mix of corundum and other substances, and the mix is less abrasive, with an average hardness near 8.0.
[7] Water has maximum density at –
A.
-4°C
B.
0°C
C.
4°C
D.
100°C
Ans:
4°C
Explanation :
When cooled from room temperature liquid water becomes increasingly dense, as with other substances, but at approximately 4 °C (39 °F), pure water reaches its maximum density.
[8] gives hardness to stainless steel.
A.
Zinc
B.
Lead
C.
Carbon
D.
Tin
Ans:
Carbon
Explanation :
Iron is alloyed with carbon to make steel and has the effect of increasing the hardness and strength of iron.
[9] The ‘solid waste’ is also known as -
A.
Sedge
B.
Toxic waste
C.
Sludge
D.
Scrubber
Ans:
Sludge
Explanation :
Solid waste, also known as sludge, refers to the residual, semi-solid material that is produced as a by- product during sewage treatment of industrial or municipal wastewater. It mainly results from manufacturing process such as that of factories, industries, mills, and mining operations.
[10] Which of the following has pH value 7?
A.
Pure Water
B.
H2SO4
C.
Sodium Carbonate
D.
HCl
Ans:
Pure Water
Explanation :
In chemistry, pH is a numeric scale used to specify the acidity or basicity of an aqueous solution. Solutions with a pH less than 7 are acidic and solutions with a pH greater than 7 are basic. Pure water is neutral, being neither an acid nor basic; so it has pH value of 7.
[11] Chemical name of vinegar is -
A.
Acetone
B.
Acetic acid
C.
Formaldehyde
D.
Ethanol
Ans:
Acetic acid
Explanation :
Vinegar is roughly 3-9% acetic acid CH3COOH) by volume, making acetic acid the main component of vinegar apart from water. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. Vinegar is mainly used as a cooking ingredient, or in pickling.
[12] Mercury is a –
A.
solid metal
B.
liquid metal
C.
solid non-metal
D.
liquid non-metal
Ans:
liquid metal
Explanation :
A heavy, silvery d-block element, Mercury is the only metal that is liquid at standard conditions for temperature and pressure; the only other element that is liquid under these conditions is bromine. With a freezing point of -38.83 °C and boiling point of 356.73 °C, mercury has one of the narrowest ranges of its liquid state of any metal.
[13] Spirit in contact with body gives cool sensation because it is –
A.
liquid
B.
transparent
C.
highly volatile
D.
a good conductor
Ans:
highly volatile
Explanation :
Spirit is very volatile. So when it is exposed, it evaporates rapidly to the air if released into the environment, producing a cool effect.
[14] Natural rubber is the polymer of :
A.
Isoprene
B.
Styrene
C.
Butadiene
D.
Ethylene
Ans:
Isoprene
Explanation :
Isoprene was first isolated by thermal decomposition of natural rubber. About 95% of isoprene production is used to produce cis-1,4- polyisoprene—a synthetic version of natural rubber.
[15] In addition to hydrogen, the other abundant element present on Sun’s surface is -
A.
Helium
B.
Neon
C.
Argon
D.
Oxygen
Ans:
Helium
Explanation :
The Sun is composed primarily of the chemical elements hydrogen and helium; they account for 74.9% and 23.8% of the mass of the Sun in the photosphere, respectively. All heavier elements, called metals in astronomy, account for less than 2% of the mass. The Sun inherited its chemical composition from the interstellar medium out of which it formed: the hydrogen and helium in the Sun were produced by Big Bang nucleosynthesis.
[16] If lime water is kept in the air, it turns milky due to presence of –
A.
Carbondioxide
B.
Nitrogen
C.
Oxygen
D.
Sulphurdioxide
Ans:
Carbondioxide
Explanation :
Lime water is calcium hydroxide (Ca(OH)2). When carbon dioxide is passed into it, it turns milky because of the formation of calcium carbonate: Ca(OH)2 + CO2 = CaCO3 +H2O
[17] Heavy metal pollution of water is caused by:
A.
Paints
B.
Wood burning
C.
Acid Plants
D.
Domestic sewage
Ans:
Paints
Explanation :
Heavy metals (cadmium, cobalt, chromium, copper, mercury, manganese, nickel, lead, zinc, molybdenum, tin) are among the main pollutants. Industrial paints are loaded with metals such as lead, calcium, cadmium and other such chemicals, When any amount of paint is led off into the water bodies it causes water pollution by causing the amount of heavy metals present in water to fluctuate, Each one of these has severe toxic effects on living beings, and tend to accumulate in aquatic food chains.
[18] Nitrogen forms a variety of compounds in all oxidation states ranging from -
A.
-3 to + 5
B.
-3 to +3
C.
-3 to + 4
D.
-3 to +6
Ans:
-3 to + 5
Explanation :
Nitrogen compounds are chemical compounds containing nitrogen ions. Nitrogen forms compounds with a wide range of oxidation states that range from -3 for the nitride ion to in nitrates and nitric acid. +5 oxidation state compounds are strong oxidizing agents. -3 oxidation state compounds are weak reducing agents.
[19] The next higher homologue of C6H14 is -
A.
C6H14
B.
C7H12
C.
C6H12
D.
C7H16
Ans:
C7H16
Explanation :
In chemistry, a homologous series is a series of compounds with a similar general formula, possessing similar chemical properties due to the presence of the same functional group. C6H14 stands for Hexane which is an alkane with six carbon atoms. In the alkane homologous series, each member differs from the previous one by a CH2 group (or 14 atomic mass units). The CH2 group is called Methylene Group. So the higher homologue of Hexane is Heptane (C7H16).
[20] Biogas majorly contains -
A.
Ethane
B.
Methane
C.
Hydrogen
D.
CO
Ans:
Methane
Explanation :
Biogas is a mixture of different gases, major portion in biogas being methane (CH4) and carbon dioxide (CO2). It also contains traces of other gases like hydrogen (H2), Moisture (H2O) , hydrogen sulfide (H2S) etc.
[21] The sewage obtained from water closets and urinals is known as –
A.
Sanitary waste
B.
Industrial waste
C.
Garbage
D.
Sullage
Ans:
Sanitary waste
Explanation :
The sewage obtained from water closets and urinals in known as Sanitary waste.
[22] In organic compounds, nitrogen is estimated by –
A.
Carius method
B.
Victor-Meyees method
C.
Liebigs method
D.
Dumas' method
Ans:
Dumas' method
Explanation :
In Dumas' method, a known quantity of nitrogen containing organic compound is heated strongly with excess of copper oxide in an atmosphere of carbon dioxide to produce free nitrogen in addition to carbon dioxide and water.
[23] The hottest part of the gas flame is known as –
A.
blue zone
B.
non-luminous zone
C.
luminous zone
D.
dark zone
Ans:
luminous zone
Explanation :
The hottest part of the gas flame is known as luminous zone.
[24] What is dry ice?
A.
Solid Carbon dioxide
B.
Solid Nitrogen dioxide
C.
Solid Sulphur dioxide
D.
Solid Water
Ans:
Solid Carbon dioxide
Explanation :
Dry ice, sometimes referred to as "cardice," is the solid form of carbon dioxide. Its advantages include lower temperature than that of water ice and not leaving any residue (other than incidental frost from moisture in the atmosphere).
[25] Nail polish remover contains?
A.
benzene
B.
acetic acid
C.
acetone
D.
petroleum ether
Ans:
petroleum ether
Explanation :
Acetone can remove artificial nails made of acrylic or cured gel. A less harsh nail polish remover is ethyl acetate, which often also contains isopropyl alcohol. Ethyl acetate is usually the original solvent for nail polish itself.
Explanation :
Hard water is water that has high mineral content (in contrast with "soft water"). Hard water is formed whenwater percolates through deposits of limestone and chalk which are largely made up of calcium and magnesium carbonates.
[6] Ruby and sapphire are oxides of -
A.
capper
B.
tin
C.
iron
D.
aluminium
Ans:
aluminium
Explanation :
Aluminium forms one stable oxide, known by its mineral name corundum. Sapphire and ruby are impure corundum contaminated with trace amounts of other metals. Corundum is a crystalline form of aluminium oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the naturally clear transparent materials, but can have different colours when impurities are present. Transparent specimens are used as gems, called ruby if red and padparadscha if pink-orange. All other colours are called sapphire, e.g., “green sapphire” for a green specimen. Because of corundum’s hardness (pure corundum is defined to have 9.0 Mohs), it can scratch almost every other mineral. It is commonly used as an abrasive, on everything from sandpaper to large machines used in machining metals, plastics, and wood. Some emery is a mix of corundum and other substances, and the mix is less abrasive, with an average hardness near 8.0.
[7] Water has maximum density at –
A.
-4°C
B.
0°C
C.
4°C
D.
100°C
Ans:
4°C
Explanation :
When cooled from room temperature liquid water becomes increasingly dense, as with other substances, but at approximately 4 °C (39 °F), pure water reaches its maximum density.
[8] gives hardness to stainless steel.
A.
Zinc
B.
Lead
C.
Carbon
D.
Tin
Ans:
Carbon
Explanation :
Iron is alloyed with carbon to make steel and has the effect of increasing the hardness and strength of iron.
[9] The ‘solid waste’ is also known as -
A.
Sedge
B.
Toxic waste
C.
Sludge
D.
Scrubber
Ans:
Sludge
Explanation :
Solid waste, also known as sludge, refers to the residual, semi-solid material that is produced as a by- product during sewage treatment of industrial or municipal wastewater. It mainly results from manufacturing process such as that of factories, industries, mills, and mining operations.
[10] Which of the following has pH value 7?
A.
Pure Water
B.
H2SO4
C.
Sodium Carbonate
D.
HCl
Ans:
Pure Water
Explanation :
In chemistry, pH is a numeric scale used to specify the acidity or basicity of an aqueous solution. Solutions with a pH less than 7 are acidic and solutions with a pH greater than 7 are basic. Pure water is neutral, being neither an acid nor basic; so it has pH value of 7.
[11] Chemical name of vinegar is -
A.
Acetone
B.
Acetic acid
C.
Formaldehyde
D.
Ethanol
Ans:
Acetic acid
Explanation :
Vinegar is roughly 3-9% acetic acid CH3COOH) by volume, making acetic acid the main component of vinegar apart from water. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. Vinegar is mainly used as a cooking ingredient, or in pickling.
[12] Mercury is a –
A.
solid metal
B.
liquid metal
C.
solid non-metal
D.
liquid non-metal
Ans:
liquid metal
Explanation :
A heavy, silvery d-block element, Mercury is the only metal that is liquid at standard conditions for temperature and pressure; the only other element that is liquid under these conditions is bromine. With a freezing point of -38.83 °C and boiling point of 356.73 °C, mercury has one of the narrowest ranges of its liquid state of any metal.
[13] Spirit in contact with body gives cool sensation because it is –
A.
liquid
B.
transparent
C.
highly volatile
D.
a good conductor
Ans:
highly volatile
Explanation :
Spirit is very volatile. So when it is exposed, it evaporates rapidly to the air if released into the environment, producing a cool effect.
[14] Natural rubber is the polymer of :
A.
Isoprene
B.
Styrene
C.
Butadiene
D.
Ethylene
Ans:
Isoprene
Explanation :
Isoprene was first isolated by thermal decomposition of natural rubber. About 95% of isoprene production is used to produce cis-1,4- polyisoprene—a synthetic version of natural rubber.
[15] In addition to hydrogen, the other abundant element present on Sun’s surface is -
A.
Helium
B.
Neon
C.
Argon
D.
Oxygen
Ans:
Helium
Explanation :
The Sun is composed primarily of the chemical elements hydrogen and helium; they account for 74.9% and 23.8% of the mass of the Sun in the photosphere, respectively. All heavier elements, called metals in astronomy, account for less than 2% of the mass. The Sun inherited its chemical composition from the interstellar medium out of which it formed: the hydrogen and helium in the Sun were produced by Big Bang nucleosynthesis.
[16] If lime water is kept in the air, it turns milky due to presence of –
A.
Carbondioxide
B.
Nitrogen
C.
Oxygen
D.
Sulphurdioxide
Ans:
Carbondioxide
Explanation :
Lime water is calcium hydroxide (Ca(OH)2). When carbon dioxide is passed into it, it turns milky because of the formation of calcium carbonate: Ca(OH)2 + CO2 = CaCO3 +H2O
[17] Heavy metal pollution of water is caused by:
A.
Paints
B.
Wood burning
C.
Acid Plants
D.
Domestic sewage
Ans:
Paints
Explanation :
Heavy metals (cadmium, cobalt, chromium, copper, mercury, manganese, nickel, lead, zinc, molybdenum, tin) are among the main pollutants. Industrial paints are loaded with metals such as lead, calcium, cadmium and other such chemicals, When any amount of paint is led off into the water bodies it causes water pollution by causing the amount of heavy metals present in water to fluctuate, Each one of these has severe toxic effects on living beings, and tend to accumulate in aquatic food chains.
[18] Nitrogen forms a variety of compounds in all oxidation states ranging from -
A.
-3 to + 5
B.
-3 to +3
C.
-3 to + 4
D.
-3 to +6
Ans:
-3 to + 5
Explanation :
Nitrogen compounds are chemical compounds containing nitrogen ions. Nitrogen forms compounds with a wide range of oxidation states that range from -3 for the nitride ion to in nitrates and nitric acid. +5 oxidation state compounds are strong oxidizing agents. -3 oxidation state compounds are weak reducing agents.
[19] The next higher homologue of C6H14 is -
A.
C6H14
B.
C7H12
C.
C6H12
D.
C7H16
Ans:
C7H16
Explanation :
In chemistry, a homologous series is a series of compounds with a similar general formula, possessing similar chemical properties due to the presence of the same functional group. C6H14 stands for Hexane which is an alkane with six carbon atoms. In the alkane homologous series, each member differs from the previous one by a CH2 group (or 14 atomic mass units). The CH2 group is called Methylene Group. So the higher homologue of Hexane is Heptane (C7H16).
[20] Biogas majorly contains -
A.
Ethane
B.
Methane
C.
Hydrogen
D.
CO
Ans:
Methane
Explanation :
Biogas is a mixture of different gases, major portion in biogas being methane (CH4) and carbon dioxide (CO2). It also contains traces of other gases like hydrogen (H2), Moisture (H2O) , hydrogen sulfide (H2S) etc.
[21] The sewage obtained from water closets and urinals is known as –
A.
Sanitary waste
B.
Industrial waste
C.
Garbage
D.
Sullage
Ans:
Sanitary waste
Explanation :
The sewage obtained from water closets and urinals in known as Sanitary waste.
[22] In organic compounds, nitrogen is estimated by –
A.
Carius method
B.
Victor-Meyees method
C.
Liebigs method
D.
Dumas' method
Ans:
Dumas' method
Explanation :
In Dumas' method, a known quantity of nitrogen containing organic compound is heated strongly with excess of copper oxide in an atmosphere of carbon dioxide to produce free nitrogen in addition to carbon dioxide and water.
[23] The hottest part of the gas flame is known as –
A.
blue zone
B.
non-luminous zone
C.
luminous zone
D.
dark zone
Ans:
luminous zone
Explanation :
The hottest part of the gas flame is known as luminous zone.
[24] What is dry ice?
A.
Solid Carbon dioxide
B.
Solid Nitrogen dioxide
C.
Solid Sulphur dioxide
D.
Solid Water
Ans:
Solid Carbon dioxide
Explanation :
Dry ice, sometimes referred to as "cardice," is the solid form of carbon dioxide. Its advantages include lower temperature than that of water ice and not leaving any residue (other than incidental frost from moisture in the atmosphere).
[25] Nail polish remover contains?
A.
benzene
B.
acetic acid
C.
acetone
D.
petroleum ether
Ans:
petroleum ether
Explanation :
Acetone can remove artificial nails made of acrylic or cured gel. A less harsh nail polish remover is ethyl acetate, which often also contains isopropyl alcohol. Ethyl acetate is usually the original solvent for nail polish itself.
Explanation :
When cooled from room temperature liquid water becomes increasingly dense, as with other substances, but at approximately 4 °C (39 °F), pure water reaches its maximum density.
[8] gives hardness to stainless steel.
A.
Zinc
B.
Lead
C.
Carbon
D.
Tin
Ans:
Carbon
Explanation :
Iron is alloyed with carbon to make steel and has the effect of increasing the hardness and strength of iron.
[9] The ‘solid waste’ is also known as -
A.
Sedge
B.
Toxic waste
C.
Sludge
D.
Scrubber
Ans:
Sludge
Explanation :
Solid waste, also known as sludge, refers to the residual, semi-solid material that is produced as a by- product during sewage treatment of industrial or municipal wastewater. It mainly results from manufacturing process such as that of factories, industries, mills, and mining operations.
[10] Which of the following has pH value 7?
A.
Pure Water
B.
H2SO4
C.
Sodium Carbonate
D.
HCl
Ans:
Pure Water
Explanation :
In chemistry, pH is a numeric scale used to specify the acidity or basicity of an aqueous solution. Solutions with a pH less than 7 are acidic and solutions with a pH greater than 7 are basic. Pure water is neutral, being neither an acid nor basic; so it has pH value of 7.
[11] Chemical name of vinegar is -
A.
Acetone
B.
Acetic acid
C.
Formaldehyde
D.
Ethanol
Ans:
Acetic acid
Explanation :
Vinegar is roughly 3-9% acetic acid CH3COOH) by volume, making acetic acid the main component of vinegar apart from water. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. Vinegar is mainly used as a cooking ingredient, or in pickling.
[12] Mercury is a –
A.
solid metal
B.
liquid metal
C.
solid non-metal
D.
liquid non-metal
Ans:
liquid metal
Explanation :
A heavy, silvery d-block element, Mercury is the only metal that is liquid at standard conditions for temperature and pressure; the only other element that is liquid under these conditions is bromine. With a freezing point of -38.83 °C and boiling point of 356.73 °C, mercury has one of the narrowest ranges of its liquid state of any metal.
[13] Spirit in contact with body gives cool sensation because it is –
A.
liquid
B.
transparent
C.
highly volatile
D.
a good conductor
Ans:
highly volatile
Explanation :
Spirit is very volatile. So when it is exposed, it evaporates rapidly to the air if released into the environment, producing a cool effect.
[14] Natural rubber is the polymer of :
A.
Isoprene
B.
Styrene
C.
Butadiene
D.
Ethylene
Ans:
Isoprene
Explanation :
Isoprene was first isolated by thermal decomposition of natural rubber. About 95% of isoprene production is used to produce cis-1,4- polyisoprene—a synthetic version of natural rubber.
[15] In addition to hydrogen, the other abundant element present on Sun’s surface is -
A.
Helium
B.
Neon
C.
Argon
D.
Oxygen
Ans:
Helium
Explanation :
The Sun is composed primarily of the chemical elements hydrogen and helium; they account for 74.9% and 23.8% of the mass of the Sun in the photosphere, respectively. All heavier elements, called metals in astronomy, account for less than 2% of the mass. The Sun inherited its chemical composition from the interstellar medium out of which it formed: the hydrogen and helium in the Sun were produced by Big Bang nucleosynthesis.
[16] If lime water is kept in the air, it turns milky due to presence of –
A.
Carbondioxide
B.
Nitrogen
C.
Oxygen
D.
Sulphurdioxide
Ans:
Carbondioxide
Explanation :
Lime water is calcium hydroxide (Ca(OH)2). When carbon dioxide is passed into it, it turns milky because of the formation of calcium carbonate: Ca(OH)2 + CO2 = CaCO3 +H2O
[17] Heavy metal pollution of water is caused by:
A.
Paints
B.
Wood burning
C.
Acid Plants
D.
Domestic sewage
Ans:
Paints
Explanation :
Heavy metals (cadmium, cobalt, chromium, copper, mercury, manganese, nickel, lead, zinc, molybdenum, tin) are among the main pollutants. Industrial paints are loaded with metals such as lead, calcium, cadmium and other such chemicals, When any amount of paint is led off into the water bodies it causes water pollution by causing the amount of heavy metals present in water to fluctuate, Each one of these has severe toxic effects on living beings, and tend to accumulate in aquatic food chains.
[18] Nitrogen forms a variety of compounds in all oxidation states ranging from -
A.
-3 to + 5
B.
-3 to +3
C.
-3 to + 4
D.
-3 to +6
Ans:
-3 to + 5
Explanation :
Nitrogen compounds are chemical compounds containing nitrogen ions. Nitrogen forms compounds with a wide range of oxidation states that range from -3 for the nitride ion to in nitrates and nitric acid. +5 oxidation state compounds are strong oxidizing agents. -3 oxidation state compounds are weak reducing agents.
[19] The next higher homologue of C6H14 is -
A.
C6H14
B.
C7H12
C.
C6H12
D.
C7H16
Ans:
C7H16
Explanation :
In chemistry, a homologous series is a series of compounds with a similar general formula, possessing similar chemical properties due to the presence of the same functional group. C6H14 stands for Hexane which is an alkane with six carbon atoms. In the alkane homologous series, each member differs from the previous one by a CH2 group (or 14 atomic mass units). The CH2 group is called Methylene Group. So the higher homologue of Hexane is Heptane (C7H16).
[20] Biogas majorly contains -
A.
Ethane
B.
Methane
C.
Hydrogen
D.
CO
Ans:
Methane
Explanation :
Biogas is a mixture of different gases, major portion in biogas being methane (CH4) and carbon dioxide (CO2). It also contains traces of other gases like hydrogen (H2), Moisture (H2O) , hydrogen sulfide (H2S) etc.
[21] The sewage obtained from water closets and urinals is known as –
A.
Sanitary waste
B.
Industrial waste
C.
Garbage
D.
Sullage
Ans:
Sanitary waste
Explanation :
The sewage obtained from water closets and urinals in known as Sanitary waste.
[22] In organic compounds, nitrogen is estimated by –
A.
Carius method
B.
Victor-Meyees method
C.
Liebigs method
D.
Dumas' method
Ans:
Dumas' method
Explanation :
In Dumas' method, a known quantity of nitrogen containing organic compound is heated strongly with excess of copper oxide in an atmosphere of carbon dioxide to produce free nitrogen in addition to carbon dioxide and water.
[23] The hottest part of the gas flame is known as –
A.
blue zone
B.
non-luminous zone
C.
luminous zone
D.
dark zone
Ans:
luminous zone
Explanation :
The hottest part of the gas flame is known as luminous zone.
[24] What is dry ice?
A.
Solid Carbon dioxide
B.
Solid Nitrogen dioxide
C.
Solid Sulphur dioxide
D.
Solid Water
Ans:
Solid Carbon dioxide
Explanation :
Dry ice, sometimes referred to as "cardice," is the solid form of carbon dioxide. Its advantages include lower temperature than that of water ice and not leaving any residue (other than incidental frost from moisture in the atmosphere).
[25] Nail polish remover contains?
A.
benzene
B.
acetic acid
C.
acetone
D.
petroleum ether
Ans:
petroleum ether
Explanation :
Acetone can remove artificial nails made of acrylic or cured gel. A less harsh nail polish remover is ethyl acetate, which often also contains isopropyl alcohol. Ethyl acetate is usually the original solvent for nail polish itself.
Explanation :
Solid waste, also known as sludge, refers to the residual, semi-solid material that is produced as a by- product during sewage treatment of industrial or municipal wastewater. It mainly results from manufacturing process such as that of factories, industries, mills, and mining operations.
[10] Which of the following has pH value 7?
A.
Pure Water
B.
H2SO4
C.
Sodium Carbonate
D.
HCl
Ans:
Pure Water
Explanation :
In chemistry, pH is a numeric scale used to specify the acidity or basicity of an aqueous solution. Solutions with a pH less than 7 are acidic and solutions with a pH greater than 7 are basic. Pure water is neutral, being neither an acid nor basic; so it has pH value of 7.
[11] Chemical name of vinegar is -
A.
Acetone
B.
Acetic acid
C.
Formaldehyde
D.
Ethanol
Ans:
Acetic acid
Explanation :
Vinegar is roughly 3-9% acetic acid CH3COOH) by volume, making acetic acid the main component of vinegar apart from water. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. Vinegar is mainly used as a cooking ingredient, or in pickling.
[12] Mercury is a –
A.
solid metal
B.
liquid metal
C.
solid non-metal
D.
liquid non-metal
Ans:
liquid metal
Explanation :
A heavy, silvery d-block element, Mercury is the only metal that is liquid at standard conditions for temperature and pressure; the only other element that is liquid under these conditions is bromine. With a freezing point of -38.83 °C and boiling point of 356.73 °C, mercury has one of the narrowest ranges of its liquid state of any metal.
[13] Spirit in contact with body gives cool sensation because it is –
A.
liquid
B.
transparent
C.
highly volatile
D.
a good conductor
Ans:
highly volatile
Explanation :
Spirit is very volatile. So when it is exposed, it evaporates rapidly to the air if released into the environment, producing a cool effect.
[14] Natural rubber is the polymer of :
A.
Isoprene
B.
Styrene
C.
Butadiene
D.
Ethylene
Ans:
Isoprene
Explanation :
Isoprene was first isolated by thermal decomposition of natural rubber. About 95% of isoprene production is used to produce cis-1,4- polyisoprene—a synthetic version of natural rubber.
[15] In addition to hydrogen, the other abundant element present on Sun’s surface is -
A.
Helium
B.
Neon
C.
Argon
D.
Oxygen
Ans:
Helium
Explanation :
The Sun is composed primarily of the chemical elements hydrogen and helium; they account for 74.9% and 23.8% of the mass of the Sun in the photosphere, respectively. All heavier elements, called metals in astronomy, account for less than 2% of the mass. The Sun inherited its chemical composition from the interstellar medium out of which it formed: the hydrogen and helium in the Sun were produced by Big Bang nucleosynthesis.
[16] If lime water is kept in the air, it turns milky due to presence of –
A.
Carbondioxide
B.
Nitrogen
C.
Oxygen
D.
Sulphurdioxide
Ans:
Carbondioxide
Explanation :
Lime water is calcium hydroxide (Ca(OH)2). When carbon dioxide is passed into it, it turns milky because of the formation of calcium carbonate: Ca(OH)2 + CO2 = CaCO3 +H2O
[17] Heavy metal pollution of water is caused by:
A.
Paints
B.
Wood burning
C.
Acid Plants
D.
Domestic sewage
Ans:
Paints
Explanation :
Heavy metals (cadmium, cobalt, chromium, copper, mercury, manganese, nickel, lead, zinc, molybdenum, tin) are among the main pollutants. Industrial paints are loaded with metals such as lead, calcium, cadmium and other such chemicals, When any amount of paint is led off into the water bodies it causes water pollution by causing the amount of heavy metals present in water to fluctuate, Each one of these has severe toxic effects on living beings, and tend to accumulate in aquatic food chains.
[18] Nitrogen forms a variety of compounds in all oxidation states ranging from -
A.
-3 to + 5
B.
-3 to +3
C.
-3 to + 4
D.
-3 to +6
Ans:
-3 to + 5
Explanation :
Nitrogen compounds are chemical compounds containing nitrogen ions. Nitrogen forms compounds with a wide range of oxidation states that range from -3 for the nitride ion to in nitrates and nitric acid. +5 oxidation state compounds are strong oxidizing agents. -3 oxidation state compounds are weak reducing agents.
[19] The next higher homologue of C6H14 is -
A.
C6H14
B.
C7H12
C.
C6H12
D.
C7H16
Ans:
C7H16
Explanation :
In chemistry, a homologous series is a series of compounds with a similar general formula, possessing similar chemical properties due to the presence of the same functional group. C6H14 stands for Hexane which is an alkane with six carbon atoms. In the alkane homologous series, each member differs from the previous one by a CH2 group (or 14 atomic mass units). The CH2 group is called Methylene Group. So the higher homologue of Hexane is Heptane (C7H16).
[20] Biogas majorly contains -
A.
Ethane
B.
Methane
C.
Hydrogen
D.
CO
Ans:
Methane
Explanation :
Biogas is a mixture of different gases, major portion in biogas being methane (CH4) and carbon dioxide (CO2). It also contains traces of other gases like hydrogen (H2), Moisture (H2O) , hydrogen sulfide (H2S) etc.
[21] The sewage obtained from water closets and urinals is known as –
A.
Sanitary waste
B.
Industrial waste
C.
Garbage
D.
Sullage
Ans:
Sanitary waste
Explanation :
The sewage obtained from water closets and urinals in known as Sanitary waste.
[22] In organic compounds, nitrogen is estimated by –
A.
Carius method
B.
Victor-Meyees method
C.
Liebigs method
D.
Dumas' method
Ans:
Dumas' method
Explanation :
In Dumas' method, a known quantity of nitrogen containing organic compound is heated strongly with excess of copper oxide in an atmosphere of carbon dioxide to produce free nitrogen in addition to carbon dioxide and water.
[23] The hottest part of the gas flame is known as –
A.
blue zone
B.
non-luminous zone
C.
luminous zone
D.
dark zone
Ans:
luminous zone
Explanation :
The hottest part of the gas flame is known as luminous zone.
[24] What is dry ice?
A.
Solid Carbon dioxide
B.
Solid Nitrogen dioxide
C.
Solid Sulphur dioxide
D.
Solid Water
Ans:
Solid Carbon dioxide
Explanation :
Dry ice, sometimes referred to as "cardice," is the solid form of carbon dioxide. Its advantages include lower temperature than that of water ice and not leaving any residue (other than incidental frost from moisture in the atmosphere).
[25] Nail polish remover contains?
A.
benzene
B.
acetic acid
C.
acetone
D.
petroleum ether
Ans:
petroleum ether
Explanation :
Acetone can remove artificial nails made of acrylic or cured gel. A less harsh nail polish remover is ethyl acetate, which often also contains isopropyl alcohol. Ethyl acetate is usually the original solvent for nail polish itself.
Explanation :
Vinegar is roughly 3-9% acetic acid CH3COOH) by volume, making acetic acid the main component of vinegar apart from water. The acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. Vinegar is mainly used as a cooking ingredient, or in pickling.
[12] Mercury is a –
A.
solid metal
B.
liquid metal
C.
solid non-metal
D.
liquid non-metal
Ans:
liquid metal
Explanation :
A heavy, silvery d-block element, Mercury is the only metal that is liquid at standard conditions for temperature and pressure; the only other element that is liquid under these conditions is bromine. With a freezing point of -38.83 °C and boiling point of 356.73 °C, mercury has one of the narrowest ranges of its liquid state of any metal.
[13] Spirit in contact with body gives cool sensation because it is –
A.
liquid
B.
transparent
C.
highly volatile
D.
a good conductor
Ans:
highly volatile
Explanation :
Spirit is very volatile. So when it is exposed, it evaporates rapidly to the air if released into the environment, producing a cool effect.
[14] Natural rubber is the polymer of :
A.
Isoprene
B.
Styrene
C.
Butadiene
D.
Ethylene
Ans:
Isoprene
Explanation :
Isoprene was first isolated by thermal decomposition of natural rubber. About 95% of isoprene production is used to produce cis-1,4- polyisoprene—a synthetic version of natural rubber.
[15] In addition to hydrogen, the other abundant element present on Sun’s surface is -
A.
Helium
B.
Neon
C.
Argon
D.
Oxygen
Ans:
Helium
Explanation :
The Sun is composed primarily of the chemical elements hydrogen and helium; they account for 74.9% and 23.8% of the mass of the Sun in the photosphere, respectively. All heavier elements, called metals in astronomy, account for less than 2% of the mass. The Sun inherited its chemical composition from the interstellar medium out of which it formed: the hydrogen and helium in the Sun were produced by Big Bang nucleosynthesis.
[16] If lime water is kept in the air, it turns milky due to presence of –
A.
Carbondioxide
B.
Nitrogen
C.
Oxygen
D.
Sulphurdioxide
Ans:
Carbondioxide
Explanation :
Lime water is calcium hydroxide (Ca(OH)2). When carbon dioxide is passed into it, it turns milky because of the formation of calcium carbonate: Ca(OH)2 + CO2 = CaCO3 +H2O
[17] Heavy metal pollution of water is caused by:
A.
Paints
B.
Wood burning
C.
Acid Plants
D.
Domestic sewage
Ans:
Paints
Explanation :
Heavy metals (cadmium, cobalt, chromium, copper, mercury, manganese, nickel, lead, zinc, molybdenum, tin) are among the main pollutants. Industrial paints are loaded with metals such as lead, calcium, cadmium and other such chemicals, When any amount of paint is led off into the water bodies it causes water pollution by causing the amount of heavy metals present in water to fluctuate, Each one of these has severe toxic effects on living beings, and tend to accumulate in aquatic food chains.
[18] Nitrogen forms a variety of compounds in all oxidation states ranging from -
A.
-3 to + 5
B.
-3 to +3
C.
-3 to + 4
D.
-3 to +6
Ans:
-3 to + 5
Explanation :
Nitrogen compounds are chemical compounds containing nitrogen ions. Nitrogen forms compounds with a wide range of oxidation states that range from -3 for the nitride ion to in nitrates and nitric acid. +5 oxidation state compounds are strong oxidizing agents. -3 oxidation state compounds are weak reducing agents.
[19] The next higher homologue of C6H14 is -
A.
C6H14
B.
C7H12
C.
C6H12
D.
C7H16
Ans:
C7H16
Explanation :
In chemistry, a homologous series is a series of compounds with a similar general formula, possessing similar chemical properties due to the presence of the same functional group. C6H14 stands for Hexane which is an alkane with six carbon atoms. In the alkane homologous series, each member differs from the previous one by a CH2 group (or 14 atomic mass units). The CH2 group is called Methylene Group. So the higher homologue of Hexane is Heptane (C7H16).
[20] Biogas majorly contains -
A.
Ethane
B.
Methane
C.
Hydrogen
D.
CO
Ans:
Methane
Explanation :
Biogas is a mixture of different gases, major portion in biogas being methane (CH4) and carbon dioxide (CO2). It also contains traces of other gases like hydrogen (H2), Moisture (H2O) , hydrogen sulfide (H2S) etc.
[21] The sewage obtained from water closets and urinals is known as –
A.
Sanitary waste
B.
Industrial waste
C.
Garbage
D.
Sullage
Ans:
Sanitary waste
Explanation :
The sewage obtained from water closets and urinals in known as Sanitary waste.
[22] In organic compounds, nitrogen is estimated by –
A.
Carius method
B.
Victor-Meyees method
C.
Liebigs method
D.
Dumas' method
Ans:
Dumas' method
Explanation :
In Dumas' method, a known quantity of nitrogen containing organic compound is heated strongly with excess of copper oxide in an atmosphere of carbon dioxide to produce free nitrogen in addition to carbon dioxide and water.
[23] The hottest part of the gas flame is known as –
A.
blue zone
B.
non-luminous zone
C.
luminous zone
D.
dark zone
Ans:
luminous zone
Explanation :
The hottest part of the gas flame is known as luminous zone.
[24] What is dry ice?
A.
Solid Carbon dioxide
B.
Solid Nitrogen dioxide
C.
Solid Sulphur dioxide
D.
Solid Water
Ans:
Solid Carbon dioxide
Explanation :
Dry ice, sometimes referred to as "cardice," is the solid form of carbon dioxide. Its advantages include lower temperature than that of water ice and not leaving any residue (other than incidental frost from moisture in the atmosphere).
[25] Nail polish remover contains?
A.
benzene
B.
acetic acid
C.
acetone
D.
petroleum ether
Ans:
petroleum ether
Explanation :
Acetone can remove artificial nails made of acrylic or cured gel. A less harsh nail polish remover is ethyl acetate, which often also contains isopropyl alcohol. Ethyl acetate is usually the original solvent for nail polish itself.
Explanation :
Spirit is very volatile. So when it is exposed, it evaporates rapidly to the air if released into the environment, producing a cool effect.
[14] Natural rubber is the polymer of :
A.
Isoprene
B.
Styrene
C.
Butadiene
D.
Ethylene
Ans:
Isoprene
Explanation :
Isoprene was first isolated by thermal decomposition of natural rubber. About 95% of isoprene production is used to produce cis-1,4- polyisoprene—a synthetic version of natural rubber.
[15] In addition to hydrogen, the other abundant element present on Sun’s surface is -
A.
Helium
B.
Neon
C.
Argon
D.
Oxygen
Ans:
Helium
Explanation :
The Sun is composed primarily of the chemical elements hydrogen and helium; they account for 74.9% and 23.8% of the mass of the Sun in the photosphere, respectively. All heavier elements, called metals in astronomy, account for less than 2% of the mass. The Sun inherited its chemical composition from the interstellar medium out of which it formed: the hydrogen and helium in the Sun were produced by Big Bang nucleosynthesis.
[16] If lime water is kept in the air, it turns milky due to presence of –
A.
Carbondioxide
B.
Nitrogen
C.
Oxygen
D.
Sulphurdioxide
Ans:
Carbondioxide
Explanation :
Lime water is calcium hydroxide (Ca(OH)2). When carbon dioxide is passed into it, it turns milky because of the formation of calcium carbonate: Ca(OH)2 + CO2 = CaCO3 +H2O
[17] Heavy metal pollution of water is caused by:
A.
Paints
B.
Wood burning
C.
Acid Plants
D.
Domestic sewage
Ans:
Paints
Explanation :
Heavy metals (cadmium, cobalt, chromium, copper, mercury, manganese, nickel, lead, zinc, molybdenum, tin) are among the main pollutants. Industrial paints are loaded with metals such as lead, calcium, cadmium and other such chemicals, When any amount of paint is led off into the water bodies it causes water pollution by causing the amount of heavy metals present in water to fluctuate, Each one of these has severe toxic effects on living beings, and tend to accumulate in aquatic food chains.
[18] Nitrogen forms a variety of compounds in all oxidation states ranging from -
A.
-3 to + 5
B.
-3 to +3
C.
-3 to + 4
D.
-3 to +6
Ans:
-3 to + 5
Explanation :
Nitrogen compounds are chemical compounds containing nitrogen ions. Nitrogen forms compounds with a wide range of oxidation states that range from -3 for the nitride ion to in nitrates and nitric acid. +5 oxidation state compounds are strong oxidizing agents. -3 oxidation state compounds are weak reducing agents.
[19] The next higher homologue of C6H14 is -
A.
C6H14
B.
C7H12
C.
C6H12
D.
C7H16
Ans:
C7H16
Explanation :
In chemistry, a homologous series is a series of compounds with a similar general formula, possessing similar chemical properties due to the presence of the same functional group. C6H14 stands for Hexane which is an alkane with six carbon atoms. In the alkane homologous series, each member differs from the previous one by a CH2 group (or 14 atomic mass units). The CH2 group is called Methylene Group. So the higher homologue of Hexane is Heptane (C7H16).
[20] Biogas majorly contains -
A.
Ethane
B.
Methane
C.
Hydrogen
D.
CO
Ans:
Methane
Explanation :
Biogas is a mixture of different gases, major portion in biogas being methane (CH4) and carbon dioxide (CO2). It also contains traces of other gases like hydrogen (H2), Moisture (H2O) , hydrogen sulfide (H2S) etc.
[21] The sewage obtained from water closets and urinals is known as –
A.
Sanitary waste
B.
Industrial waste
C.
Garbage
D.
Sullage
Ans:
Sanitary waste
Explanation :
The sewage obtained from water closets and urinals in known as Sanitary waste.
[22] In organic compounds, nitrogen is estimated by –
A.
Carius method
B.
Victor-Meyees method
C.
Liebigs method
D.
Dumas' method
Ans:
Dumas' method
Explanation :
In Dumas' method, a known quantity of nitrogen containing organic compound is heated strongly with excess of copper oxide in an atmosphere of carbon dioxide to produce free nitrogen in addition to carbon dioxide and water.
[23] The hottest part of the gas flame is known as –
A.
blue zone
B.
non-luminous zone
C.
luminous zone
D.
dark zone
Ans:
luminous zone
Explanation :
The hottest part of the gas flame is known as luminous zone.
[24] What is dry ice?
A.
Solid Carbon dioxide
B.
Solid Nitrogen dioxide
C.
Solid Sulphur dioxide
D.
Solid Water
Ans:
Solid Carbon dioxide
Explanation :
Dry ice, sometimes referred to as "cardice," is the solid form of carbon dioxide. Its advantages include lower temperature than that of water ice and not leaving any residue (other than incidental frost from moisture in the atmosphere).
[25] Nail polish remover contains?
A.
benzene
B.
acetic acid
C.
acetone
D.
petroleum ether
Ans:
petroleum ether
Explanation :
Acetone can remove artificial nails made of acrylic or cured gel. A less harsh nail polish remover is ethyl acetate, which often also contains isopropyl alcohol. Ethyl acetate is usually the original solvent for nail polish itself.
Explanation :
The Sun is composed primarily of the chemical elements hydrogen and helium; they account for 74.9% and 23.8% of the mass of the Sun in the photosphere, respectively. All heavier elements, called metals in astronomy, account for less than 2% of the mass. The Sun inherited its chemical composition from the interstellar medium out of which it formed: the hydrogen and helium in the Sun were produced by Big Bang nucleosynthesis.
[16] If lime water is kept in the air, it turns milky due to presence of –
A.
Carbondioxide
B.
Nitrogen
C.
Oxygen
D.
Sulphurdioxide
Ans:
Carbondioxide
Explanation :
Lime water is calcium hydroxide (Ca(OH)2). When carbon dioxide is passed into it, it turns milky because of the formation of calcium carbonate: Ca(OH)2 + CO2 = CaCO3 +H2O
[17] Heavy metal pollution of water is caused by:
A.
Paints
B.
Wood burning
C.
Acid Plants
D.
Domestic sewage
Ans:
Paints
Explanation :
Heavy metals (cadmium, cobalt, chromium, copper, mercury, manganese, nickel, lead, zinc, molybdenum, tin) are among the main pollutants. Industrial paints are loaded with metals such as lead, calcium, cadmium and other such chemicals, When any amount of paint is led off into the water bodies it causes water pollution by causing the amount of heavy metals present in water to fluctuate, Each one of these has severe toxic effects on living beings, and tend to accumulate in aquatic food chains.
[18] Nitrogen forms a variety of compounds in all oxidation states ranging from -
A.
-3 to + 5
B.
-3 to +3
C.
-3 to + 4
D.
-3 to +6
Ans:
-3 to + 5
Explanation :
Nitrogen compounds are chemical compounds containing nitrogen ions. Nitrogen forms compounds with a wide range of oxidation states that range from -3 for the nitride ion to in nitrates and nitric acid. +5 oxidation state compounds are strong oxidizing agents. -3 oxidation state compounds are weak reducing agents.
[19] The next higher homologue of C6H14 is -
A.
C6H14
B.
C7H12
C.
C6H12
D.
C7H16
Ans:
C7H16
Explanation :
In chemistry, a homologous series is a series of compounds with a similar general formula, possessing similar chemical properties due to the presence of the same functional group. C6H14 stands for Hexane which is an alkane with six carbon atoms. In the alkane homologous series, each member differs from the previous one by a CH2 group (or 14 atomic mass units). The CH2 group is called Methylene Group. So the higher homologue of Hexane is Heptane (C7H16).
[20] Biogas majorly contains -
A.
Ethane
B.
Methane
C.
Hydrogen
D.
CO
Ans:
Methane
Explanation :
Biogas is a mixture of different gases, major portion in biogas being methane (CH4) and carbon dioxide (CO2). It also contains traces of other gases like hydrogen (H2), Moisture (H2O) , hydrogen sulfide (H2S) etc.
[21] The sewage obtained from water closets and urinals is known as –
A.
Sanitary waste
B.
Industrial waste
C.
Garbage
D.
Sullage
Ans:
Sanitary waste
Explanation :
The sewage obtained from water closets and urinals in known as Sanitary waste.
[22] In organic compounds, nitrogen is estimated by –
A.
Carius method
B.
Victor-Meyees method
C.
Liebigs method
D.
Dumas' method
Ans:
Dumas' method
Explanation :
In Dumas' method, a known quantity of nitrogen containing organic compound is heated strongly with excess of copper oxide in an atmosphere of carbon dioxide to produce free nitrogen in addition to carbon dioxide and water.
[23] The hottest part of the gas flame is known as –
A.
blue zone
B.
non-luminous zone
C.
luminous zone
D.
dark zone
Ans:
luminous zone
Explanation :
The hottest part of the gas flame is known as luminous zone.
[24] What is dry ice?
A.
Solid Carbon dioxide
B.
Solid Nitrogen dioxide
C.
Solid Sulphur dioxide
D.
Solid Water
Ans:
Solid Carbon dioxide
Explanation :
Dry ice, sometimes referred to as "cardice," is the solid form of carbon dioxide. Its advantages include lower temperature than that of water ice and not leaving any residue (other than incidental frost from moisture in the atmosphere).
[25] Nail polish remover contains?
A.
benzene
B.
acetic acid
C.
acetone
D.
petroleum ether
Ans:
petroleum ether
Explanation :
Acetone can remove artificial nails made of acrylic or cured gel. A less harsh nail polish remover is ethyl acetate, which often also contains isopropyl alcohol. Ethyl acetate is usually the original solvent for nail polish itself.
Explanation :
Heavy metals (cadmium, cobalt, chromium, copper, mercury, manganese, nickel, lead, zinc, molybdenum, tin) are among the main pollutants. Industrial paints are loaded with metals such as lead, calcium, cadmium and other such chemicals, When any amount of paint is led off into the water bodies it causes water pollution by causing the amount of heavy metals present in water to fluctuate, Each one of these has severe toxic effects on living beings, and tend to accumulate in aquatic food chains.
[18] Nitrogen forms a variety of compounds in all oxidation states ranging from -
A.
-3 to + 5
B.
-3 to +3
C.
-3 to + 4
D.
-3 to +6
Ans:
-3 to + 5
Explanation :
Nitrogen compounds are chemical compounds containing nitrogen ions. Nitrogen forms compounds with a wide range of oxidation states that range from -3 for the nitride ion to in nitrates and nitric acid. +5 oxidation state compounds are strong oxidizing agents. -3 oxidation state compounds are weak reducing agents.
[19] The next higher homologue of C6H14 is -
A.
C6H14
B.
C7H12
C.
C6H12
D.
C7H16
Ans:
C7H16
Explanation :
In chemistry, a homologous series is a series of compounds with a similar general formula, possessing similar chemical properties due to the presence of the same functional group. C6H14 stands for Hexane which is an alkane with six carbon atoms. In the alkane homologous series, each member differs from the previous one by a CH2 group (or 14 atomic mass units). The CH2 group is called Methylene Group. So the higher homologue of Hexane is Heptane (C7H16).
[20] Biogas majorly contains -
A.
Ethane
B.
Methane
C.
Hydrogen
D.
CO
Ans:
Methane
Explanation :
Biogas is a mixture of different gases, major portion in biogas being methane (CH4) and carbon dioxide (CO2). It also contains traces of other gases like hydrogen (H2), Moisture (H2O) , hydrogen sulfide (H2S) etc.
[21] The sewage obtained from water closets and urinals is known as –
A.
Sanitary waste
B.
Industrial waste
C.
Garbage
D.
Sullage
Ans:
Sanitary waste
Explanation :
The sewage obtained from water closets and urinals in known as Sanitary waste.
[22] In organic compounds, nitrogen is estimated by –
A.
Carius method
B.
Victor-Meyees method
C.
Liebigs method
D.
Dumas' method
Ans:
Dumas' method
Explanation :
In Dumas' method, a known quantity of nitrogen containing organic compound is heated strongly with excess of copper oxide in an atmosphere of carbon dioxide to produce free nitrogen in addition to carbon dioxide and water.
[23] The hottest part of the gas flame is known as –
A.
blue zone
B.
non-luminous zone
C.
luminous zone
D.
dark zone
Ans:
luminous zone
Explanation :
The hottest part of the gas flame is known as luminous zone.
[24] What is dry ice?
A.
Solid Carbon dioxide
B.
Solid Nitrogen dioxide
C.
Solid Sulphur dioxide
D.
Solid Water
Ans:
Solid Carbon dioxide
Explanation :
Dry ice, sometimes referred to as "cardice," is the solid form of carbon dioxide. Its advantages include lower temperature than that of water ice and not leaving any residue (other than incidental frost from moisture in the atmosphere).
[25] Nail polish remover contains?
A.
benzene
B.
acetic acid
C.
acetone
D.
petroleum ether
Ans:
petroleum ether
Explanation :
Acetone can remove artificial nails made of acrylic or cured gel. A less harsh nail polish remover is ethyl acetate, which often also contains isopropyl alcohol. Ethyl acetate is usually the original solvent for nail polish itself.
Explanation :
In chemistry, a homologous series is a series of compounds with a similar general formula, possessing similar chemical properties due to the presence of the same functional group. C6H14 stands for Hexane which is an alkane with six carbon atoms. In the alkane homologous series, each member differs from the previous one by a CH2 group (or 14 atomic mass units). The CH2 group is called Methylene Group. So the higher homologue of Hexane is Heptane (C7H16).
[20] Biogas majorly contains -
A.
Ethane
B.
Methane
C.
Hydrogen
D.
CO
Ans:
Methane
Explanation :
Biogas is a mixture of different gases, major portion in biogas being methane (CH4) and carbon dioxide (CO2). It also contains traces of other gases like hydrogen (H2), Moisture (H2O) , hydrogen sulfide (H2S) etc.
[21] The sewage obtained from water closets and urinals is known as –
A.
Sanitary waste
B.
Industrial waste
C.
Garbage
D.
Sullage
Ans:
Sanitary waste
Explanation :
The sewage obtained from water closets and urinals in known as Sanitary waste.
[22] In organic compounds, nitrogen is estimated by –
A.
Carius method
B.
Victor-Meyees method
C.
Liebigs method
D.
Dumas' method
Ans:
Dumas' method
Explanation :
In Dumas' method, a known quantity of nitrogen containing organic compound is heated strongly with excess of copper oxide in an atmosphere of carbon dioxide to produce free nitrogen in addition to carbon dioxide and water.
[23] The hottest part of the gas flame is known as –
A.
blue zone
B.
non-luminous zone
C.
luminous zone
D.
dark zone
Ans:
luminous zone
Explanation :
The hottest part of the gas flame is known as luminous zone.
[24] What is dry ice?
A.
Solid Carbon dioxide
B.
Solid Nitrogen dioxide
C.
Solid Sulphur dioxide
D.
Solid Water
Ans:
Solid Carbon dioxide
Explanation :
Dry ice, sometimes referred to as "cardice," is the solid form of carbon dioxide. Its advantages include lower temperature than that of water ice and not leaving any residue (other than incidental frost from moisture in the atmosphere).
[25] Nail polish remover contains?
A.
benzene
B.
acetic acid
C.
acetone
D.
petroleum ether
Ans:
petroleum ether
Explanation :
Acetone can remove artificial nails made of acrylic or cured gel. A less harsh nail polish remover is ethyl acetate, which often also contains isopropyl alcohol. Ethyl acetate is usually the original solvent for nail polish itself.
Explanation :
The sewage obtained from water closets and urinals in known as Sanitary waste.
[22] In organic compounds, nitrogen is estimated by –
A.
Carius method
B.
Victor-Meyees method
C.
Liebigs method
D.
Dumas' method
Ans:
Dumas' method
Explanation :
In Dumas' method, a known quantity of nitrogen containing organic compound is heated strongly with excess of copper oxide in an atmosphere of carbon dioxide to produce free nitrogen in addition to carbon dioxide and water.
[23] The hottest part of the gas flame is known as –
A.
blue zone
B.
non-luminous zone
C.
luminous zone
D.
dark zone
Ans:
luminous zone
Explanation :
The hottest part of the gas flame is known as luminous zone.
[24] What is dry ice?
A.
Solid Carbon dioxide
B.
Solid Nitrogen dioxide
C.
Solid Sulphur dioxide
D.
Solid Water
Ans:
Solid Carbon dioxide
Explanation :
Dry ice, sometimes referred to as "cardice," is the solid form of carbon dioxide. Its advantages include lower temperature than that of water ice and not leaving any residue (other than incidental frost from moisture in the atmosphere).
[25] Nail polish remover contains?
A.
benzene
B.
acetic acid
C.
acetone
D.
petroleum ether
Ans:
petroleum ether
Explanation :
Acetone can remove artificial nails made of acrylic or cured gel. A less harsh nail polish remover is ethyl acetate, which often also contains isopropyl alcohol. Ethyl acetate is usually the original solvent for nail polish itself.
Explanation :
The hottest part of the gas flame is known as luminous zone.
[24] What is dry ice?
A.
Solid Carbon dioxide
B.
Solid Nitrogen dioxide
C.
Solid Sulphur dioxide
D.
Solid Water
Ans:
Solid Carbon dioxide
Explanation :
Dry ice, sometimes referred to as "cardice," is the solid form of carbon dioxide. Its advantages include lower temperature than that of water ice and not leaving any residue (other than incidental frost from moisture in the atmosphere).
[25] Nail polish remover contains?
A.
benzene
B.
acetic acid
C.
acetone
D.
petroleum ether
Ans:
petroleum ether
Explanation :
Acetone can remove artificial nails made of acrylic or cured gel. A less harsh nail polish remover is ethyl acetate, which often also contains isopropyl alcohol. Ethyl acetate is usually the original solvent for nail polish itself.
Explanation :
Acetone can remove artificial nails made of acrylic or cured gel. A less harsh nail polish remover is ethyl acetate, which often also contains isopropyl alcohol. Ethyl acetate is usually the original solvent for nail polish itself.