[1] Which one of the following metals does not react with water to produce Hydrogen?
A.
Cadmium
B.
Lithium
C.
Potassium
D.
Sodium
Ans:
Cadmium
Explanation :
Cadmium is a soft, malleable, ductile, bluish-white divalent metal. It is similar in many respects to zinc but forms complex compounds. Unlike other metals, cadmium is resistant to corrosion and as a result it is used as a protective layer when deposited on other metals. As a bulk metal, cadmium is insoluble in water and is not flammable; however, in its powdered form it may burn and release toxic fumes. Cadmium occurs as a minor component in most zinc ores and therefore is a byproduct of zinc production. It was used for a long time as a pigment and for corrosion resistant plating on steel while cadmium compounds were used to stabilize plastic. With the exception of its use in nickel–cadmium batteries and cadmium telluride solar panels, the use of cadmium is generally decreasing. These declines have been due to competing technologies, cadmium’s toxicity in certain forms and concentration and resulting regulations.
[2] Which of the following is not an ore of magnesium?
A.
Carnallite
B.
Dolomite
C.
Calamine
D.
Sea water
Ans:
Calamine
Explanation :
0
[3] Which of the following is usually not an air-pollutant?
A.
Hydrocarbons
B.
Sulphur dioxide
C.
Carbon dioxide
D.
Nitrous oxide
Ans:
Nitrous oxide
Explanation :
The six air pollutants are carbon monoxide, lead, ground-level ozone, nitrogen dioxide, particulate matter, and sulfur dioxide. The combustion of gasoline and other hydrocarbon fuels in automobiles, trucks, and jet airplanes produces several primary air pollutants. Nitrous oxide (N2O), commonly known as laughing gas, is used in surgery and dentistry for its an-aesthetic and analgesic effects.
[4] Which of the following fuels causes minimum environmental pollution?
A.
Diesel
B.
Kerosene
C.
Hydrogen
D.
Coal
Ans:
Hydrogen
Explanation :
Coal, diesel and kerosene are examples of fossil fuels that contribute to pollution. In contrast, hydrogen burns in air, it produces nothing but water vapor and energy. It is considered as totally clean and non- polluting source of energy.
[5] The compound used in prickly-heat powder to prevent excessive sweating is –
A.
Boric acid
B.
Phosphoric acid
C.
Carbonic acid
D.
Sulphonic acid
Ans:
Boric acid
Explanation :
Boric acid (H3BO3), also called hydrogen borate, boracie acid, orthoboric acid and acidum boricum, is used in prickly heat powders to prevent excessive sweating. Boric acid is also used as an antiseptic for minor burns or cuts and is sometimes used in dressings or salves. As an antibacterial compound, boric acid can also be used for acne treatment.
[6] The colour of Emerald is -
A.
Violet
B.
Yellow
C.
Deep Green
D.
Prussian Blue
Ans:
Deep Green
Explanation :
The most desirable emerald colors are bluish green to pure green, with vivid color saturation and tone that's not too dark. The most-prized emeralds are highly transparent. Their color is evenly distributed, with no eye-visible colorzoning.
[7] The oxygen liberated during Photosynthes is comes from -
A.
Water
B.
Carbon dioxide
C.
Glucose
D.
Chlorophyll
Ans:
Water
Explanation :
The oxygen produced during photosynthesis comes from water. The electrons excited by light in the chlorophyll molecule are replaced by electrons produced from the oxidation of water into oxygen.
[8] Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of -
A.
Nitrates
B.
Zeolites
C.
Sulphonates
D.
None of these
Ans:
Zeolites
Explanation :
Zeolites are crystalline solids structures made of silicon, aluminum and oxygen that form a framework with cavities and channels inside where cations, water and/or small molecules may reside.
[9] Adding which substance gives blue colour to glass?
A.
Manganese oxide
B.
Cobalt oxide
C.
Chromium oxide
D.
Iron oxide
Ans:
Cobalt oxide
Explanation :
Cobalt is the strongest of the coloring oxides, giving a range of blues in most glasses. It is such a powerful colorant that only a few parts per million is needed to produce a light blue color such as the shade used for certain bottled waters.
[10] The antiparticle of an electron is –
A.
Positron
B.
Proton
C.
Alpha particles
D.
Beta particles
Ans:
Positron
Explanation :
Corresponding to most kings of particles, there is an associated antiparticle with the same mass and opposite charge (including electric charge). The antiparticle of the electron is the positron (antielectron), which has positive charge and is produced naturally in certain types of radioactive decay. The opposite is also true: the antiparticle of the positron is the electron.
[11] Vinegar is .
A.
diluted acetic acid
B.
glacial acetic acid
C.
glacial formic acid
D.
diluted formic acid
Ans:
diluted acetic acid
Explanation :
Vinegar is mostly dilute acetic acid, often produced by fermentation and subsequent oxidation of ethanol. It is roughly 3-9% acetic acid by volume, making acetic acid the main component of vinegar apart from water.
[12] What is the product formed when sodium bicarbonate is heated strongly?
A.
Sodium Carbonate
B.
Sodium Hydroxide
C.
Sodium Peroxide
D.
Sodium Monoxide
Ans:
Sodium Carbonate
Explanation :
When sodium bicarbonate is strongly heated, it decomposes into sodium carbonate, water vapor, and carbon dioxide. Solid sodium carbonate is a white powder and is used in cooking under the name 'baking powder'; sodium bicarbonate is used in baking under the name 'baking soda'.
[13] The most electronegative element among the following is -
A.
sodium
B.
bromine
C.
fluorine
D.
oxygen
Ans:
fluorine
Explanation :
Electronegativity of the elements using the Pauling Scale is as follows: Fluorine: 3.98, Oxygen: 3.44, Chlorine: 3.16, and Sodium: 0.93. Electronegativity increases down the group and decreases down the period.
[14] Atomic size refers to the of an atom.
A.
Radius
B.
Circumference
C.
Diameter
D.
Centre
Ans:
Radius
Explanation :
The term atomic size refers to the radius of an atom. The atomic size may be visualized as the distance between the centre of the nucleus and the outermost shell of an isolated atom.
[15] Which is the highest quality of hard coal?
A.
Anthracite
B.
Bituminous
C.
Lignite
D.
Peat
Ans:
Anthracite
Explanation :
Anthracite is the highest rank of coal. It is the most metamorphosed type of coal, in which the carbon content is between 92.1% and 98%. Anthracite coal generally has the highest heating value per ton on a mineral-matter-free basis. Anthracite is often referred to as hard coal.
[16] Which of the following is not a commercial source of energy?
A.
Coal
B.
Petroleum
C.
Natural Gas
D.
Firewood
Ans:
Firewood
Explanation :
Firewood, agricultural waste (straw, etc.) and animals waste (cowdung) are the important components of non-commercial energy. It is generally used in the rural area for domestic purposes— mainly cooking. Coal, petroleum products, natural gas and, electricity are the important components of commercial energy.
[17] Which one of the following substances does not have a melting point?
A.
Bromine
B.
Sodium chloride
C.
Mercury
D.
Glass
Ans:
Mercury
Explanation :
The boiling point is the temperature at which a material changes from a liquid to a gas (boils) while the melting point is the temperature at which a material changes from a solid to a liquid (melts).
[18] Which one of the following metals occurs in nature in free state?
A.
Gold
B.
Sodium
C.
Aluminium
D.
Copper
Ans:
Gold
Explanation :
Gold is found on every continent on Earth, except Antarctica. The largest amounts of gold on Earth are found in the oceans - but it is not yet feasible to extract gold from seawater.
[19] The soft silvery metalic element which ionizes easily when heated or exposed to light and is present in atomic clocks is –
A.
Cerium
B.
Cesium
C.
Calcium
D.
Californium
Ans:
Cesium
Explanation :
1967, based on Einstein defining the speed of light as the most constant dimension in the universe, the International System of Units isolated two specific wave counts from an emission spectrum of caesium- 133 to codefine the second and the meter. Since then, caesium has been widely used in highly accurate atomic clocks. Among alkali metals, cesium has lowest ionization energy and hence it can show photoelectric effect to the maximum extent.
[20] Catalytic converters are generally made from –
A.
Alkaline metals
B.
Hydrogen
C.
Transition metals
D.
Carbon
Ans:
Transition metals
Explanation :
Transition metals are used directly as catalysts in the anti-pollution catalytic converters in car exhausts. For example, expensive transition metals such as Platinum and rhodium are used in the catalytic converters in car exhausts to reduce the emission of carbon monoxide and nitrogen monoxide, which are converted to the non-polluting gases nitrogen and carbon dioxide.
[21] In galvanization, iron is coated with –
A.
Copper
B.
Zinc
C.
Tin
D.
Nickel
Ans:
Zinc
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanization, in which parts are submerged in a bath of molten zinc.
[22] Which one of the folling is also khow as solution?
A.
Acompound
B.
Ahomogeneous mixture
C.
A heterogeneous mixture
D.
A suspension
Ans:
Ahomogeneous mixture
Explanation :
In chemistry, a solution is a homogeneous mixture composed of only one phase. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent. The solution more or less takes on the characteristics of the solvent including its phase.
[23] Which of the following is very reactive and kept in kerosene?
A.
Sodium
B.
Potassium
C.
Iodine
D.
Bromine
Ans:
Sodium
Explanation :
Sodium is a very reactive metal. It reacts vigorously with oxygen and water. A lot of heat is generated in this process. Therefore, it is stored in kerosene to avoid contacts between either atmospheric oxygen or water.
[24] Which one of the following is known as the ‘brown coal’?
A.
Anthracite
B.
Bituminous
C.
Coke
D.
Lignite
Ans:
Lignite
Explanation :
Lignite, often referred to as brown coal, is a soft brown fuel with characteristics that put it somewhere between coal and peat. It is considered the lowest rank of coal. It has a carbon content of around 25- 30%.
[25] The chief source of naphthalene is -
A.
Coal-tar
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tar
Explanation :
Naphthalene is derived from a kind of naphtha which is a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar.
Explanation :
Cadmium is a soft, malleable, ductile, bluish-white divalent metal. It is similar in many respects to zinc but forms complex compounds. Unlike other metals, cadmium is resistant to corrosion and as a result it is used as a protective layer when deposited on other metals. As a bulk metal, cadmium is insoluble in water and is not flammable; however, in its powdered form it may burn and release toxic fumes. Cadmium occurs as a minor component in most zinc ores and therefore is a byproduct of zinc production. It was used for a long time as a pigment and for corrosion resistant plating on steel while cadmium compounds were used to stabilize plastic. With the exception of its use in nickel–cadmium batteries and cadmium telluride solar panels, the use of cadmium is generally decreasing. These declines have been due to competing technologies, cadmium’s toxicity in certain forms and concentration and resulting regulations.
[2] Which of the following is not an ore of magnesium?
A.
Carnallite
B.
Dolomite
C.
Calamine
D.
Sea water
Ans:
Calamine
Explanation :
0
[3] Which of the following is usually not an air-pollutant?
A.
Hydrocarbons
B.
Sulphur dioxide
C.
Carbon dioxide
D.
Nitrous oxide
Ans:
Nitrous oxide
Explanation :
The six air pollutants are carbon monoxide, lead, ground-level ozone, nitrogen dioxide, particulate matter, and sulfur dioxide. The combustion of gasoline and other hydrocarbon fuels in automobiles, trucks, and jet airplanes produces several primary air pollutants. Nitrous oxide (N2O), commonly known as laughing gas, is used in surgery and dentistry for its an-aesthetic and analgesic effects.
[4] Which of the following fuels causes minimum environmental pollution?
A.
Diesel
B.
Kerosene
C.
Hydrogen
D.
Coal
Ans:
Hydrogen
Explanation :
Coal, diesel and kerosene are examples of fossil fuels that contribute to pollution. In contrast, hydrogen burns in air, it produces nothing but water vapor and energy. It is considered as totally clean and non- polluting source of energy.
[5] The compound used in prickly-heat powder to prevent excessive sweating is –
A.
Boric acid
B.
Phosphoric acid
C.
Carbonic acid
D.
Sulphonic acid
Ans:
Boric acid
Explanation :
Boric acid (H3BO3), also called hydrogen borate, boracie acid, orthoboric acid and acidum boricum, is used in prickly heat powders to prevent excessive sweating. Boric acid is also used as an antiseptic for minor burns or cuts and is sometimes used in dressings or salves. As an antibacterial compound, boric acid can also be used for acne treatment.
[6] The colour of Emerald is -
A.
Violet
B.
Yellow
C.
Deep Green
D.
Prussian Blue
Ans:
Deep Green
Explanation :
The most desirable emerald colors are bluish green to pure green, with vivid color saturation and tone that's not too dark. The most-prized emeralds are highly transparent. Their color is evenly distributed, with no eye-visible colorzoning.
[7] The oxygen liberated during Photosynthes is comes from -
A.
Water
B.
Carbon dioxide
C.
Glucose
D.
Chlorophyll
Ans:
Water
Explanation :
The oxygen produced during photosynthesis comes from water. The electrons excited by light in the chlorophyll molecule are replaced by electrons produced from the oxidation of water into oxygen.
[8] Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of -
A.
Nitrates
B.
Zeolites
C.
Sulphonates
D.
None of these
Ans:
Zeolites
Explanation :
Zeolites are crystalline solids structures made of silicon, aluminum and oxygen that form a framework with cavities and channels inside where cations, water and/or small molecules may reside.
[9] Adding which substance gives blue colour to glass?
A.
Manganese oxide
B.
Cobalt oxide
C.
Chromium oxide
D.
Iron oxide
Ans:
Cobalt oxide
Explanation :
Cobalt is the strongest of the coloring oxides, giving a range of blues in most glasses. It is such a powerful colorant that only a few parts per million is needed to produce a light blue color such as the shade used for certain bottled waters.
[10] The antiparticle of an electron is –
A.
Positron
B.
Proton
C.
Alpha particles
D.
Beta particles
Ans:
Positron
Explanation :
Corresponding to most kings of particles, there is an associated antiparticle with the same mass and opposite charge (including electric charge). The antiparticle of the electron is the positron (antielectron), which has positive charge and is produced naturally in certain types of radioactive decay. The opposite is also true: the antiparticle of the positron is the electron.
[11] Vinegar is .
A.
diluted acetic acid
B.
glacial acetic acid
C.
glacial formic acid
D.
diluted formic acid
Ans:
diluted acetic acid
Explanation :
Vinegar is mostly dilute acetic acid, often produced by fermentation and subsequent oxidation of ethanol. It is roughly 3-9% acetic acid by volume, making acetic acid the main component of vinegar apart from water.
[12] What is the product formed when sodium bicarbonate is heated strongly?
A.
Sodium Carbonate
B.
Sodium Hydroxide
C.
Sodium Peroxide
D.
Sodium Monoxide
Ans:
Sodium Carbonate
Explanation :
When sodium bicarbonate is strongly heated, it decomposes into sodium carbonate, water vapor, and carbon dioxide. Solid sodium carbonate is a white powder and is used in cooking under the name 'baking powder'; sodium bicarbonate is used in baking under the name 'baking soda'.
[13] The most electronegative element among the following is -
A.
sodium
B.
bromine
C.
fluorine
D.
oxygen
Ans:
fluorine
Explanation :
Electronegativity of the elements using the Pauling Scale is as follows: Fluorine: 3.98, Oxygen: 3.44, Chlorine: 3.16, and Sodium: 0.93. Electronegativity increases down the group and decreases down the period.
[14] Atomic size refers to the of an atom.
A.
Radius
B.
Circumference
C.
Diameter
D.
Centre
Ans:
Radius
Explanation :
The term atomic size refers to the radius of an atom. The atomic size may be visualized as the distance between the centre of the nucleus and the outermost shell of an isolated atom.
[15] Which is the highest quality of hard coal?
A.
Anthracite
B.
Bituminous
C.
Lignite
D.
Peat
Ans:
Anthracite
Explanation :
Anthracite is the highest rank of coal. It is the most metamorphosed type of coal, in which the carbon content is between 92.1% and 98%. Anthracite coal generally has the highest heating value per ton on a mineral-matter-free basis. Anthracite is often referred to as hard coal.
[16] Which of the following is not a commercial source of energy?
A.
Coal
B.
Petroleum
C.
Natural Gas
D.
Firewood
Ans:
Firewood
Explanation :
Firewood, agricultural waste (straw, etc.) and animals waste (cowdung) are the important components of non-commercial energy. It is generally used in the rural area for domestic purposes— mainly cooking. Coal, petroleum products, natural gas and, electricity are the important components of commercial energy.
[17] Which one of the following substances does not have a melting point?
A.
Bromine
B.
Sodium chloride
C.
Mercury
D.
Glass
Ans:
Mercury
Explanation :
The boiling point is the temperature at which a material changes from a liquid to a gas (boils) while the melting point is the temperature at which a material changes from a solid to a liquid (melts).
[18] Which one of the following metals occurs in nature in free state?
A.
Gold
B.
Sodium
C.
Aluminium
D.
Copper
Ans:
Gold
Explanation :
Gold is found on every continent on Earth, except Antarctica. The largest amounts of gold on Earth are found in the oceans - but it is not yet feasible to extract gold from seawater.
[19] The soft silvery metalic element which ionizes easily when heated or exposed to light and is present in atomic clocks is –
A.
Cerium
B.
Cesium
C.
Calcium
D.
Californium
Ans:
Cesium
Explanation :
1967, based on Einstein defining the speed of light as the most constant dimension in the universe, the International System of Units isolated two specific wave counts from an emission spectrum of caesium- 133 to codefine the second and the meter. Since then, caesium has been widely used in highly accurate atomic clocks. Among alkali metals, cesium has lowest ionization energy and hence it can show photoelectric effect to the maximum extent.
[20] Catalytic converters are generally made from –
A.
Alkaline metals
B.
Hydrogen
C.
Transition metals
D.
Carbon
Ans:
Transition metals
Explanation :
Transition metals are used directly as catalysts in the anti-pollution catalytic converters in car exhausts. For example, expensive transition metals such as Platinum and rhodium are used in the catalytic converters in car exhausts to reduce the emission of carbon monoxide and nitrogen monoxide, which are converted to the non-polluting gases nitrogen and carbon dioxide.
[21] In galvanization, iron is coated with –
A.
Copper
B.
Zinc
C.
Tin
D.
Nickel
Ans:
Zinc
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanization, in which parts are submerged in a bath of molten zinc.
[22] Which one of the folling is also khow as solution?
A.
Acompound
B.
Ahomogeneous mixture
C.
A heterogeneous mixture
D.
A suspension
Ans:
Ahomogeneous mixture
Explanation :
In chemistry, a solution is a homogeneous mixture composed of only one phase. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent. The solution more or less takes on the characteristics of the solvent including its phase.
[23] Which of the following is very reactive and kept in kerosene?
A.
Sodium
B.
Potassium
C.
Iodine
D.
Bromine
Ans:
Sodium
Explanation :
Sodium is a very reactive metal. It reacts vigorously with oxygen and water. A lot of heat is generated in this process. Therefore, it is stored in kerosene to avoid contacts between either atmospheric oxygen or water.
[24] Which one of the following is known as the ‘brown coal’?
A.
Anthracite
B.
Bituminous
C.
Coke
D.
Lignite
Ans:
Lignite
Explanation :
Lignite, often referred to as brown coal, is a soft brown fuel with characteristics that put it somewhere between coal and peat. It is considered the lowest rank of coal. It has a carbon content of around 25- 30%.
[25] The chief source of naphthalene is -
A.
Coal-tar
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tar
Explanation :
Naphthalene is derived from a kind of naphtha which is a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar.
Explanation :
The six air pollutants are carbon monoxide, lead, ground-level ozone, nitrogen dioxide, particulate matter, and sulfur dioxide. The combustion of gasoline and other hydrocarbon fuels in automobiles, trucks, and jet airplanes produces several primary air pollutants. Nitrous oxide (N2O), commonly known as laughing gas, is used in surgery and dentistry for its an-aesthetic and analgesic effects.
[4] Which of the following fuels causes minimum environmental pollution?
A.
Diesel
B.
Kerosene
C.
Hydrogen
D.
Coal
Ans:
Hydrogen
Explanation :
Coal, diesel and kerosene are examples of fossil fuels that contribute to pollution. In contrast, hydrogen burns in air, it produces nothing but water vapor and energy. It is considered as totally clean and non- polluting source of energy.
[5] The compound used in prickly-heat powder to prevent excessive sweating is –
A.
Boric acid
B.
Phosphoric acid
C.
Carbonic acid
D.
Sulphonic acid
Ans:
Boric acid
Explanation :
Boric acid (H3BO3), also called hydrogen borate, boracie acid, orthoboric acid and acidum boricum, is used in prickly heat powders to prevent excessive sweating. Boric acid is also used as an antiseptic for minor burns or cuts and is sometimes used in dressings or salves. As an antibacterial compound, boric acid can also be used for acne treatment.
[6] The colour of Emerald is -
A.
Violet
B.
Yellow
C.
Deep Green
D.
Prussian Blue
Ans:
Deep Green
Explanation :
The most desirable emerald colors are bluish green to pure green, with vivid color saturation and tone that's not too dark. The most-prized emeralds are highly transparent. Their color is evenly distributed, with no eye-visible colorzoning.
[7] The oxygen liberated during Photosynthes is comes from -
A.
Water
B.
Carbon dioxide
C.
Glucose
D.
Chlorophyll
Ans:
Water
Explanation :
The oxygen produced during photosynthesis comes from water. The electrons excited by light in the chlorophyll molecule are replaced by electrons produced from the oxidation of water into oxygen.
[8] Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of -
A.
Nitrates
B.
Zeolites
C.
Sulphonates
D.
None of these
Ans:
Zeolites
Explanation :
Zeolites are crystalline solids structures made of silicon, aluminum and oxygen that form a framework with cavities and channels inside where cations, water and/or small molecules may reside.
[9] Adding which substance gives blue colour to glass?
A.
Manganese oxide
B.
Cobalt oxide
C.
Chromium oxide
D.
Iron oxide
Ans:
Cobalt oxide
Explanation :
Cobalt is the strongest of the coloring oxides, giving a range of blues in most glasses. It is such a powerful colorant that only a few parts per million is needed to produce a light blue color such as the shade used for certain bottled waters.
[10] The antiparticle of an electron is –
A.
Positron
B.
Proton
C.
Alpha particles
D.
Beta particles
Ans:
Positron
Explanation :
Corresponding to most kings of particles, there is an associated antiparticle with the same mass and opposite charge (including electric charge). The antiparticle of the electron is the positron (antielectron), which has positive charge and is produced naturally in certain types of radioactive decay. The opposite is also true: the antiparticle of the positron is the electron.
[11] Vinegar is .
A.
diluted acetic acid
B.
glacial acetic acid
C.
glacial formic acid
D.
diluted formic acid
Ans:
diluted acetic acid
Explanation :
Vinegar is mostly dilute acetic acid, often produced by fermentation and subsequent oxidation of ethanol. It is roughly 3-9% acetic acid by volume, making acetic acid the main component of vinegar apart from water.
[12] What is the product formed when sodium bicarbonate is heated strongly?
A.
Sodium Carbonate
B.
Sodium Hydroxide
C.
Sodium Peroxide
D.
Sodium Monoxide
Ans:
Sodium Carbonate
Explanation :
When sodium bicarbonate is strongly heated, it decomposes into sodium carbonate, water vapor, and carbon dioxide. Solid sodium carbonate is a white powder and is used in cooking under the name 'baking powder'; sodium bicarbonate is used in baking under the name 'baking soda'.
[13] The most electronegative element among the following is -
A.
sodium
B.
bromine
C.
fluorine
D.
oxygen
Ans:
fluorine
Explanation :
Electronegativity of the elements using the Pauling Scale is as follows: Fluorine: 3.98, Oxygen: 3.44, Chlorine: 3.16, and Sodium: 0.93. Electronegativity increases down the group and decreases down the period.
[14] Atomic size refers to the of an atom.
A.
Radius
B.
Circumference
C.
Diameter
D.
Centre
Ans:
Radius
Explanation :
The term atomic size refers to the radius of an atom. The atomic size may be visualized as the distance between the centre of the nucleus and the outermost shell of an isolated atom.
[15] Which is the highest quality of hard coal?
A.
Anthracite
B.
Bituminous
C.
Lignite
D.
Peat
Ans:
Anthracite
Explanation :
Anthracite is the highest rank of coal. It is the most metamorphosed type of coal, in which the carbon content is between 92.1% and 98%. Anthracite coal generally has the highest heating value per ton on a mineral-matter-free basis. Anthracite is often referred to as hard coal.
[16] Which of the following is not a commercial source of energy?
A.
Coal
B.
Petroleum
C.
Natural Gas
D.
Firewood
Ans:
Firewood
Explanation :
Firewood, agricultural waste (straw, etc.) and animals waste (cowdung) are the important components of non-commercial energy. It is generally used in the rural area for domestic purposes— mainly cooking. Coal, petroleum products, natural gas and, electricity are the important components of commercial energy.
[17] Which one of the following substances does not have a melting point?
A.
Bromine
B.
Sodium chloride
C.
Mercury
D.
Glass
Ans:
Mercury
Explanation :
The boiling point is the temperature at which a material changes from a liquid to a gas (boils) while the melting point is the temperature at which a material changes from a solid to a liquid (melts).
[18] Which one of the following metals occurs in nature in free state?
A.
Gold
B.
Sodium
C.
Aluminium
D.
Copper
Ans:
Gold
Explanation :
Gold is found on every continent on Earth, except Antarctica. The largest amounts of gold on Earth are found in the oceans - but it is not yet feasible to extract gold from seawater.
[19] The soft silvery metalic element which ionizes easily when heated or exposed to light and is present in atomic clocks is –
A.
Cerium
B.
Cesium
C.
Calcium
D.
Californium
Ans:
Cesium
Explanation :
1967, based on Einstein defining the speed of light as the most constant dimension in the universe, the International System of Units isolated two specific wave counts from an emission spectrum of caesium- 133 to codefine the second and the meter. Since then, caesium has been widely used in highly accurate atomic clocks. Among alkali metals, cesium has lowest ionization energy and hence it can show photoelectric effect to the maximum extent.
[20] Catalytic converters are generally made from –
A.
Alkaline metals
B.
Hydrogen
C.
Transition metals
D.
Carbon
Ans:
Transition metals
Explanation :
Transition metals are used directly as catalysts in the anti-pollution catalytic converters in car exhausts. For example, expensive transition metals such as Platinum and rhodium are used in the catalytic converters in car exhausts to reduce the emission of carbon monoxide and nitrogen monoxide, which are converted to the non-polluting gases nitrogen and carbon dioxide.
[21] In galvanization, iron is coated with –
A.
Copper
B.
Zinc
C.
Tin
D.
Nickel
Ans:
Zinc
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanization, in which parts are submerged in a bath of molten zinc.
[22] Which one of the folling is also khow as solution?
A.
Acompound
B.
Ahomogeneous mixture
C.
A heterogeneous mixture
D.
A suspension
Ans:
Ahomogeneous mixture
Explanation :
In chemistry, a solution is a homogeneous mixture composed of only one phase. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent. The solution more or less takes on the characteristics of the solvent including its phase.
[23] Which of the following is very reactive and kept in kerosene?
A.
Sodium
B.
Potassium
C.
Iodine
D.
Bromine
Ans:
Sodium
Explanation :
Sodium is a very reactive metal. It reacts vigorously with oxygen and water. A lot of heat is generated in this process. Therefore, it is stored in kerosene to avoid contacts between either atmospheric oxygen or water.
[24] Which one of the following is known as the ‘brown coal’?
A.
Anthracite
B.
Bituminous
C.
Coke
D.
Lignite
Ans:
Lignite
Explanation :
Lignite, often referred to as brown coal, is a soft brown fuel with characteristics that put it somewhere between coal and peat. It is considered the lowest rank of coal. It has a carbon content of around 25- 30%.
[25] The chief source of naphthalene is -
A.
Coal-tar
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tar
Explanation :
Naphthalene is derived from a kind of naphtha which is a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar.
Explanation :
Boric acid (H3BO3), also called hydrogen borate, boracie acid, orthoboric acid and acidum boricum, is used in prickly heat powders to prevent excessive sweating. Boric acid is also used as an antiseptic for minor burns or cuts and is sometimes used in dressings or salves. As an antibacterial compound, boric acid can also be used for acne treatment.
[6] The colour of Emerald is -
A.
Violet
B.
Yellow
C.
Deep Green
D.
Prussian Blue
Ans:
Deep Green
Explanation :
The most desirable emerald colors are bluish green to pure green, with vivid color saturation and tone that's not too dark. The most-prized emeralds are highly transparent. Their color is evenly distributed, with no eye-visible colorzoning.
[7] The oxygen liberated during Photosynthes is comes from -
A.
Water
B.
Carbon dioxide
C.
Glucose
D.
Chlorophyll
Ans:
Water
Explanation :
The oxygen produced during photosynthesis comes from water. The electrons excited by light in the chlorophyll molecule are replaced by electrons produced from the oxidation of water into oxygen.
[8] Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of -
A.
Nitrates
B.
Zeolites
C.
Sulphonates
D.
None of these
Ans:
Zeolites
Explanation :
Zeolites are crystalline solids structures made of silicon, aluminum and oxygen that form a framework with cavities and channels inside where cations, water and/or small molecules may reside.
[9] Adding which substance gives blue colour to glass?
A.
Manganese oxide
B.
Cobalt oxide
C.
Chromium oxide
D.
Iron oxide
Ans:
Cobalt oxide
Explanation :
Cobalt is the strongest of the coloring oxides, giving a range of blues in most glasses. It is such a powerful colorant that only a few parts per million is needed to produce a light blue color such as the shade used for certain bottled waters.
[10] The antiparticle of an electron is –
A.
Positron
B.
Proton
C.
Alpha particles
D.
Beta particles
Ans:
Positron
Explanation :
Corresponding to most kings of particles, there is an associated antiparticle with the same mass and opposite charge (including electric charge). The antiparticle of the electron is the positron (antielectron), which has positive charge and is produced naturally in certain types of radioactive decay. The opposite is also true: the antiparticle of the positron is the electron.
[11] Vinegar is .
A.
diluted acetic acid
B.
glacial acetic acid
C.
glacial formic acid
D.
diluted formic acid
Ans:
diluted acetic acid
Explanation :
Vinegar is mostly dilute acetic acid, often produced by fermentation and subsequent oxidation of ethanol. It is roughly 3-9% acetic acid by volume, making acetic acid the main component of vinegar apart from water.
[12] What is the product formed when sodium bicarbonate is heated strongly?
A.
Sodium Carbonate
B.
Sodium Hydroxide
C.
Sodium Peroxide
D.
Sodium Monoxide
Ans:
Sodium Carbonate
Explanation :
When sodium bicarbonate is strongly heated, it decomposes into sodium carbonate, water vapor, and carbon dioxide. Solid sodium carbonate is a white powder and is used in cooking under the name 'baking powder'; sodium bicarbonate is used in baking under the name 'baking soda'.
[13] The most electronegative element among the following is -
A.
sodium
B.
bromine
C.
fluorine
D.
oxygen
Ans:
fluorine
Explanation :
Electronegativity of the elements using the Pauling Scale is as follows: Fluorine: 3.98, Oxygen: 3.44, Chlorine: 3.16, and Sodium: 0.93. Electronegativity increases down the group and decreases down the period.
[14] Atomic size refers to the of an atom.
A.
Radius
B.
Circumference
C.
Diameter
D.
Centre
Ans:
Radius
Explanation :
The term atomic size refers to the radius of an atom. The atomic size may be visualized as the distance between the centre of the nucleus and the outermost shell of an isolated atom.
[15] Which is the highest quality of hard coal?
A.
Anthracite
B.
Bituminous
C.
Lignite
D.
Peat
Ans:
Anthracite
Explanation :
Anthracite is the highest rank of coal. It is the most metamorphosed type of coal, in which the carbon content is between 92.1% and 98%. Anthracite coal generally has the highest heating value per ton on a mineral-matter-free basis. Anthracite is often referred to as hard coal.
[16] Which of the following is not a commercial source of energy?
A.
Coal
B.
Petroleum
C.
Natural Gas
D.
Firewood
Ans:
Firewood
Explanation :
Firewood, agricultural waste (straw, etc.) and animals waste (cowdung) are the important components of non-commercial energy. It is generally used in the rural area for domestic purposes— mainly cooking. Coal, petroleum products, natural gas and, electricity are the important components of commercial energy.
[17] Which one of the following substances does not have a melting point?
A.
Bromine
B.
Sodium chloride
C.
Mercury
D.
Glass
Ans:
Mercury
Explanation :
The boiling point is the temperature at which a material changes from a liquid to a gas (boils) while the melting point is the temperature at which a material changes from a solid to a liquid (melts).
[18] Which one of the following metals occurs in nature in free state?
A.
Gold
B.
Sodium
C.
Aluminium
D.
Copper
Ans:
Gold
Explanation :
Gold is found on every continent on Earth, except Antarctica. The largest amounts of gold on Earth are found in the oceans - but it is not yet feasible to extract gold from seawater.
[19] The soft silvery metalic element which ionizes easily when heated or exposed to light and is present in atomic clocks is –
A.
Cerium
B.
Cesium
C.
Calcium
D.
Californium
Ans:
Cesium
Explanation :
1967, based on Einstein defining the speed of light as the most constant dimension in the universe, the International System of Units isolated two specific wave counts from an emission spectrum of caesium- 133 to codefine the second and the meter. Since then, caesium has been widely used in highly accurate atomic clocks. Among alkali metals, cesium has lowest ionization energy and hence it can show photoelectric effect to the maximum extent.
[20] Catalytic converters are generally made from –
A.
Alkaline metals
B.
Hydrogen
C.
Transition metals
D.
Carbon
Ans:
Transition metals
Explanation :
Transition metals are used directly as catalysts in the anti-pollution catalytic converters in car exhausts. For example, expensive transition metals such as Platinum and rhodium are used in the catalytic converters in car exhausts to reduce the emission of carbon monoxide and nitrogen monoxide, which are converted to the non-polluting gases nitrogen and carbon dioxide.
[21] In galvanization, iron is coated with –
A.
Copper
B.
Zinc
C.
Tin
D.
Nickel
Ans:
Zinc
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanization, in which parts are submerged in a bath of molten zinc.
[22] Which one of the folling is also khow as solution?
A.
Acompound
B.
Ahomogeneous mixture
C.
A heterogeneous mixture
D.
A suspension
Ans:
Ahomogeneous mixture
Explanation :
In chemistry, a solution is a homogeneous mixture composed of only one phase. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent. The solution more or less takes on the characteristics of the solvent including its phase.
[23] Which of the following is very reactive and kept in kerosene?
A.
Sodium
B.
Potassium
C.
Iodine
D.
Bromine
Ans:
Sodium
Explanation :
Sodium is a very reactive metal. It reacts vigorously with oxygen and water. A lot of heat is generated in this process. Therefore, it is stored in kerosene to avoid contacts between either atmospheric oxygen or water.
[24] Which one of the following is known as the ‘brown coal’?
A.
Anthracite
B.
Bituminous
C.
Coke
D.
Lignite
Ans:
Lignite
Explanation :
Lignite, often referred to as brown coal, is a soft brown fuel with characteristics that put it somewhere between coal and peat. It is considered the lowest rank of coal. It has a carbon content of around 25- 30%.
[25] The chief source of naphthalene is -
A.
Coal-tar
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tar
Explanation :
Naphthalene is derived from a kind of naphtha which is a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar.
Explanation :
The oxygen produced during photosynthesis comes from water. The electrons excited by light in the chlorophyll molecule are replaced by electrons produced from the oxidation of water into oxygen.
[8] Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of -
A.
Nitrates
B.
Zeolites
C.
Sulphonates
D.
None of these
Ans:
Zeolites
Explanation :
Zeolites are crystalline solids structures made of silicon, aluminum and oxygen that form a framework with cavities and channels inside where cations, water and/or small molecules may reside.
[9] Adding which substance gives blue colour to glass?
A.
Manganese oxide
B.
Cobalt oxide
C.
Chromium oxide
D.
Iron oxide
Ans:
Cobalt oxide
Explanation :
Cobalt is the strongest of the coloring oxides, giving a range of blues in most glasses. It is such a powerful colorant that only a few parts per million is needed to produce a light blue color such as the shade used for certain bottled waters.
[10] The antiparticle of an electron is –
A.
Positron
B.
Proton
C.
Alpha particles
D.
Beta particles
Ans:
Positron
Explanation :
Corresponding to most kings of particles, there is an associated antiparticle with the same mass and opposite charge (including electric charge). The antiparticle of the electron is the positron (antielectron), which has positive charge and is produced naturally in certain types of radioactive decay. The opposite is also true: the antiparticle of the positron is the electron.
[11] Vinegar is .
A.
diluted acetic acid
B.
glacial acetic acid
C.
glacial formic acid
D.
diluted formic acid
Ans:
diluted acetic acid
Explanation :
Vinegar is mostly dilute acetic acid, often produced by fermentation and subsequent oxidation of ethanol. It is roughly 3-9% acetic acid by volume, making acetic acid the main component of vinegar apart from water.
[12] What is the product formed when sodium bicarbonate is heated strongly?
A.
Sodium Carbonate
B.
Sodium Hydroxide
C.
Sodium Peroxide
D.
Sodium Monoxide
Ans:
Sodium Carbonate
Explanation :
When sodium bicarbonate is strongly heated, it decomposes into sodium carbonate, water vapor, and carbon dioxide. Solid sodium carbonate is a white powder and is used in cooking under the name 'baking powder'; sodium bicarbonate is used in baking under the name 'baking soda'.
[13] The most electronegative element among the following is -
A.
sodium
B.
bromine
C.
fluorine
D.
oxygen
Ans:
fluorine
Explanation :
Electronegativity of the elements using the Pauling Scale is as follows: Fluorine: 3.98, Oxygen: 3.44, Chlorine: 3.16, and Sodium: 0.93. Electronegativity increases down the group and decreases down the period.
[14] Atomic size refers to the of an atom.
A.
Radius
B.
Circumference
C.
Diameter
D.
Centre
Ans:
Radius
Explanation :
The term atomic size refers to the radius of an atom. The atomic size may be visualized as the distance between the centre of the nucleus and the outermost shell of an isolated atom.
[15] Which is the highest quality of hard coal?
A.
Anthracite
B.
Bituminous
C.
Lignite
D.
Peat
Ans:
Anthracite
Explanation :
Anthracite is the highest rank of coal. It is the most metamorphosed type of coal, in which the carbon content is between 92.1% and 98%. Anthracite coal generally has the highest heating value per ton on a mineral-matter-free basis. Anthracite is often referred to as hard coal.
[16] Which of the following is not a commercial source of energy?
A.
Coal
B.
Petroleum
C.
Natural Gas
D.
Firewood
Ans:
Firewood
Explanation :
Firewood, agricultural waste (straw, etc.) and animals waste (cowdung) are the important components of non-commercial energy. It is generally used in the rural area for domestic purposes— mainly cooking. Coal, petroleum products, natural gas and, electricity are the important components of commercial energy.
[17] Which one of the following substances does not have a melting point?
A.
Bromine
B.
Sodium chloride
C.
Mercury
D.
Glass
Ans:
Mercury
Explanation :
The boiling point is the temperature at which a material changes from a liquid to a gas (boils) while the melting point is the temperature at which a material changes from a solid to a liquid (melts).
[18] Which one of the following metals occurs in nature in free state?
A.
Gold
B.
Sodium
C.
Aluminium
D.
Copper
Ans:
Gold
Explanation :
Gold is found on every continent on Earth, except Antarctica. The largest amounts of gold on Earth are found in the oceans - but it is not yet feasible to extract gold from seawater.
[19] The soft silvery metalic element which ionizes easily when heated or exposed to light and is present in atomic clocks is –
A.
Cerium
B.
Cesium
C.
Calcium
D.
Californium
Ans:
Cesium
Explanation :
1967, based on Einstein defining the speed of light as the most constant dimension in the universe, the International System of Units isolated two specific wave counts from an emission spectrum of caesium- 133 to codefine the second and the meter. Since then, caesium has been widely used in highly accurate atomic clocks. Among alkali metals, cesium has lowest ionization energy and hence it can show photoelectric effect to the maximum extent.
[20] Catalytic converters are generally made from –
A.
Alkaline metals
B.
Hydrogen
C.
Transition metals
D.
Carbon
Ans:
Transition metals
Explanation :
Transition metals are used directly as catalysts in the anti-pollution catalytic converters in car exhausts. For example, expensive transition metals such as Platinum and rhodium are used in the catalytic converters in car exhausts to reduce the emission of carbon monoxide and nitrogen monoxide, which are converted to the non-polluting gases nitrogen and carbon dioxide.
[21] In galvanization, iron is coated with –
A.
Copper
B.
Zinc
C.
Tin
D.
Nickel
Ans:
Zinc
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanization, in which parts are submerged in a bath of molten zinc.
[22] Which one of the folling is also khow as solution?
A.
Acompound
B.
Ahomogeneous mixture
C.
A heterogeneous mixture
D.
A suspension
Ans:
Ahomogeneous mixture
Explanation :
In chemistry, a solution is a homogeneous mixture composed of only one phase. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent. The solution more or less takes on the characteristics of the solvent including its phase.
[23] Which of the following is very reactive and kept in kerosene?
A.
Sodium
B.
Potassium
C.
Iodine
D.
Bromine
Ans:
Sodium
Explanation :
Sodium is a very reactive metal. It reacts vigorously with oxygen and water. A lot of heat is generated in this process. Therefore, it is stored in kerosene to avoid contacts between either atmospheric oxygen or water.
[24] Which one of the following is known as the ‘brown coal’?
A.
Anthracite
B.
Bituminous
C.
Coke
D.
Lignite
Ans:
Lignite
Explanation :
Lignite, often referred to as brown coal, is a soft brown fuel with characteristics that put it somewhere between coal and peat. It is considered the lowest rank of coal. It has a carbon content of around 25- 30%.
[25] The chief source of naphthalene is -
A.
Coal-tar
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tar
Explanation :
Naphthalene is derived from a kind of naphtha which is a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar.
Explanation :
Cobalt is the strongest of the coloring oxides, giving a range of blues in most glasses. It is such a powerful colorant that only a few parts per million is needed to produce a light blue color such as the shade used for certain bottled waters.
[10] The antiparticle of an electron is –
A.
Positron
B.
Proton
C.
Alpha particles
D.
Beta particles
Ans:
Positron
Explanation :
Corresponding to most kings of particles, there is an associated antiparticle with the same mass and opposite charge (including electric charge). The antiparticle of the electron is the positron (antielectron), which has positive charge and is produced naturally in certain types of radioactive decay. The opposite is also true: the antiparticle of the positron is the electron.
[11] Vinegar is .
A.
diluted acetic acid
B.
glacial acetic acid
C.
glacial formic acid
D.
diluted formic acid
Ans:
diluted acetic acid
Explanation :
Vinegar is mostly dilute acetic acid, often produced by fermentation and subsequent oxidation of ethanol. It is roughly 3-9% acetic acid by volume, making acetic acid the main component of vinegar apart from water.
[12] What is the product formed when sodium bicarbonate is heated strongly?
A.
Sodium Carbonate
B.
Sodium Hydroxide
C.
Sodium Peroxide
D.
Sodium Monoxide
Ans:
Sodium Carbonate
Explanation :
When sodium bicarbonate is strongly heated, it decomposes into sodium carbonate, water vapor, and carbon dioxide. Solid sodium carbonate is a white powder and is used in cooking under the name 'baking powder'; sodium bicarbonate is used in baking under the name 'baking soda'.
[13] The most electronegative element among the following is -
A.
sodium
B.
bromine
C.
fluorine
D.
oxygen
Ans:
fluorine
Explanation :
Electronegativity of the elements using the Pauling Scale is as follows: Fluorine: 3.98, Oxygen: 3.44, Chlorine: 3.16, and Sodium: 0.93. Electronegativity increases down the group and decreases down the period.
[14] Atomic size refers to the of an atom.
A.
Radius
B.
Circumference
C.
Diameter
D.
Centre
Ans:
Radius
Explanation :
The term atomic size refers to the radius of an atom. The atomic size may be visualized as the distance between the centre of the nucleus and the outermost shell of an isolated atom.
[15] Which is the highest quality of hard coal?
A.
Anthracite
B.
Bituminous
C.
Lignite
D.
Peat
Ans:
Anthracite
Explanation :
Anthracite is the highest rank of coal. It is the most metamorphosed type of coal, in which the carbon content is between 92.1% and 98%. Anthracite coal generally has the highest heating value per ton on a mineral-matter-free basis. Anthracite is often referred to as hard coal.
[16] Which of the following is not a commercial source of energy?
A.
Coal
B.
Petroleum
C.
Natural Gas
D.
Firewood
Ans:
Firewood
Explanation :
Firewood, agricultural waste (straw, etc.) and animals waste (cowdung) are the important components of non-commercial energy. It is generally used in the rural area for domestic purposes— mainly cooking. Coal, petroleum products, natural gas and, electricity are the important components of commercial energy.
[17] Which one of the following substances does not have a melting point?
A.
Bromine
B.
Sodium chloride
C.
Mercury
D.
Glass
Ans:
Mercury
Explanation :
The boiling point is the temperature at which a material changes from a liquid to a gas (boils) while the melting point is the temperature at which a material changes from a solid to a liquid (melts).
[18] Which one of the following metals occurs in nature in free state?
A.
Gold
B.
Sodium
C.
Aluminium
D.
Copper
Ans:
Gold
Explanation :
Gold is found on every continent on Earth, except Antarctica. The largest amounts of gold on Earth are found in the oceans - but it is not yet feasible to extract gold from seawater.
[19] The soft silvery metalic element which ionizes easily when heated or exposed to light and is present in atomic clocks is –
A.
Cerium
B.
Cesium
C.
Calcium
D.
Californium
Ans:
Cesium
Explanation :
1967, based on Einstein defining the speed of light as the most constant dimension in the universe, the International System of Units isolated two specific wave counts from an emission spectrum of caesium- 133 to codefine the second and the meter. Since then, caesium has been widely used in highly accurate atomic clocks. Among alkali metals, cesium has lowest ionization energy and hence it can show photoelectric effect to the maximum extent.
[20] Catalytic converters are generally made from –
A.
Alkaline metals
B.
Hydrogen
C.
Transition metals
D.
Carbon
Ans:
Transition metals
Explanation :
Transition metals are used directly as catalysts in the anti-pollution catalytic converters in car exhausts. For example, expensive transition metals such as Platinum and rhodium are used in the catalytic converters in car exhausts to reduce the emission of carbon monoxide and nitrogen monoxide, which are converted to the non-polluting gases nitrogen and carbon dioxide.
[21] In galvanization, iron is coated with –
A.
Copper
B.
Zinc
C.
Tin
D.
Nickel
Ans:
Zinc
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanization, in which parts are submerged in a bath of molten zinc.
[22] Which one of the folling is also khow as solution?
A.
Acompound
B.
Ahomogeneous mixture
C.
A heterogeneous mixture
D.
A suspension
Ans:
Ahomogeneous mixture
Explanation :
In chemistry, a solution is a homogeneous mixture composed of only one phase. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent. The solution more or less takes on the characteristics of the solvent including its phase.
[23] Which of the following is very reactive and kept in kerosene?
A.
Sodium
B.
Potassium
C.
Iodine
D.
Bromine
Ans:
Sodium
Explanation :
Sodium is a very reactive metal. It reacts vigorously with oxygen and water. A lot of heat is generated in this process. Therefore, it is stored in kerosene to avoid contacts between either atmospheric oxygen or water.
[24] Which one of the following is known as the ‘brown coal’?
A.
Anthracite
B.
Bituminous
C.
Coke
D.
Lignite
Ans:
Lignite
Explanation :
Lignite, often referred to as brown coal, is a soft brown fuel with characteristics that put it somewhere between coal and peat. It is considered the lowest rank of coal. It has a carbon content of around 25- 30%.
[25] The chief source of naphthalene is -
A.
Coal-tar
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tar
Explanation :
Naphthalene is derived from a kind of naphtha which is a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar.
Explanation :
Vinegar is mostly dilute acetic acid, often produced by fermentation and subsequent oxidation of ethanol. It is roughly 3-9% acetic acid by volume, making acetic acid the main component of vinegar apart from water.
[12] What is the product formed when sodium bicarbonate is heated strongly?
A.
Sodium Carbonate
B.
Sodium Hydroxide
C.
Sodium Peroxide
D.
Sodium Monoxide
Ans:
Sodium Carbonate
Explanation :
When sodium bicarbonate is strongly heated, it decomposes into sodium carbonate, water vapor, and carbon dioxide. Solid sodium carbonate is a white powder and is used in cooking under the name 'baking powder'; sodium bicarbonate is used in baking under the name 'baking soda'.
[13] The most electronegative element among the following is -
A.
sodium
B.
bromine
C.
fluorine
D.
oxygen
Ans:
fluorine
Explanation :
Electronegativity of the elements using the Pauling Scale is as follows: Fluorine: 3.98, Oxygen: 3.44, Chlorine: 3.16, and Sodium: 0.93. Electronegativity increases down the group and decreases down the period.
[14] Atomic size refers to the of an atom.
A.
Radius
B.
Circumference
C.
Diameter
D.
Centre
Ans:
Radius
Explanation :
The term atomic size refers to the radius of an atom. The atomic size may be visualized as the distance between the centre of the nucleus and the outermost shell of an isolated atom.
[15] Which is the highest quality of hard coal?
A.
Anthracite
B.
Bituminous
C.
Lignite
D.
Peat
Ans:
Anthracite
Explanation :
Anthracite is the highest rank of coal. It is the most metamorphosed type of coal, in which the carbon content is between 92.1% and 98%. Anthracite coal generally has the highest heating value per ton on a mineral-matter-free basis. Anthracite is often referred to as hard coal.
[16] Which of the following is not a commercial source of energy?
A.
Coal
B.
Petroleum
C.
Natural Gas
D.
Firewood
Ans:
Firewood
Explanation :
Firewood, agricultural waste (straw, etc.) and animals waste (cowdung) are the important components of non-commercial energy. It is generally used in the rural area for domestic purposes— mainly cooking. Coal, petroleum products, natural gas and, electricity are the important components of commercial energy.
[17] Which one of the following substances does not have a melting point?
A.
Bromine
B.
Sodium chloride
C.
Mercury
D.
Glass
Ans:
Mercury
Explanation :
The boiling point is the temperature at which a material changes from a liquid to a gas (boils) while the melting point is the temperature at which a material changes from a solid to a liquid (melts).
[18] Which one of the following metals occurs in nature in free state?
A.
Gold
B.
Sodium
C.
Aluminium
D.
Copper
Ans:
Gold
Explanation :
Gold is found on every continent on Earth, except Antarctica. The largest amounts of gold on Earth are found in the oceans - but it is not yet feasible to extract gold from seawater.
[19] The soft silvery metalic element which ionizes easily when heated or exposed to light and is present in atomic clocks is –
A.
Cerium
B.
Cesium
C.
Calcium
D.
Californium
Ans:
Cesium
Explanation :
1967, based on Einstein defining the speed of light as the most constant dimension in the universe, the International System of Units isolated two specific wave counts from an emission spectrum of caesium- 133 to codefine the second and the meter. Since then, caesium has been widely used in highly accurate atomic clocks. Among alkali metals, cesium has lowest ionization energy and hence it can show photoelectric effect to the maximum extent.
[20] Catalytic converters are generally made from –
A.
Alkaline metals
B.
Hydrogen
C.
Transition metals
D.
Carbon
Ans:
Transition metals
Explanation :
Transition metals are used directly as catalysts in the anti-pollution catalytic converters in car exhausts. For example, expensive transition metals such as Platinum and rhodium are used in the catalytic converters in car exhausts to reduce the emission of carbon monoxide and nitrogen monoxide, which are converted to the non-polluting gases nitrogen and carbon dioxide.
[21] In galvanization, iron is coated with –
A.
Copper
B.
Zinc
C.
Tin
D.
Nickel
Ans:
Zinc
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanization, in which parts are submerged in a bath of molten zinc.
[22] Which one of the folling is also khow as solution?
A.
Acompound
B.
Ahomogeneous mixture
C.
A heterogeneous mixture
D.
A suspension
Ans:
Ahomogeneous mixture
Explanation :
In chemistry, a solution is a homogeneous mixture composed of only one phase. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent. The solution more or less takes on the characteristics of the solvent including its phase.
[23] Which of the following is very reactive and kept in kerosene?
A.
Sodium
B.
Potassium
C.
Iodine
D.
Bromine
Ans:
Sodium
Explanation :
Sodium is a very reactive metal. It reacts vigorously with oxygen and water. A lot of heat is generated in this process. Therefore, it is stored in kerosene to avoid contacts between either atmospheric oxygen or water.
[24] Which one of the following is known as the ‘brown coal’?
A.
Anthracite
B.
Bituminous
C.
Coke
D.
Lignite
Ans:
Lignite
Explanation :
Lignite, often referred to as brown coal, is a soft brown fuel with characteristics that put it somewhere between coal and peat. It is considered the lowest rank of coal. It has a carbon content of around 25- 30%.
[25] The chief source of naphthalene is -
A.
Coal-tar
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tar
Explanation :
Naphthalene is derived from a kind of naphtha which is a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar.
Explanation :
Electronegativity of the elements using the Pauling Scale is as follows: Fluorine: 3.98, Oxygen: 3.44, Chlorine: 3.16, and Sodium: 0.93. Electronegativity increases down the group and decreases down the period.
[14] Atomic size refers to the of an atom.
A.
Radius
B.
Circumference
C.
Diameter
D.
Centre
Ans:
Radius
Explanation :
The term atomic size refers to the radius of an atom. The atomic size may be visualized as the distance between the centre of the nucleus and the outermost shell of an isolated atom.
[15] Which is the highest quality of hard coal?
A.
Anthracite
B.
Bituminous
C.
Lignite
D.
Peat
Ans:
Anthracite
Explanation :
Anthracite is the highest rank of coal. It is the most metamorphosed type of coal, in which the carbon content is between 92.1% and 98%. Anthracite coal generally has the highest heating value per ton on a mineral-matter-free basis. Anthracite is often referred to as hard coal.
[16] Which of the following is not a commercial source of energy?
A.
Coal
B.
Petroleum
C.
Natural Gas
D.
Firewood
Ans:
Firewood
Explanation :
Firewood, agricultural waste (straw, etc.) and animals waste (cowdung) are the important components of non-commercial energy. It is generally used in the rural area for domestic purposes— mainly cooking. Coal, petroleum products, natural gas and, electricity are the important components of commercial energy.
[17] Which one of the following substances does not have a melting point?
A.
Bromine
B.
Sodium chloride
C.
Mercury
D.
Glass
Ans:
Mercury
Explanation :
The boiling point is the temperature at which a material changes from a liquid to a gas (boils) while the melting point is the temperature at which a material changes from a solid to a liquid (melts).
[18] Which one of the following metals occurs in nature in free state?
A.
Gold
B.
Sodium
C.
Aluminium
D.
Copper
Ans:
Gold
Explanation :
Gold is found on every continent on Earth, except Antarctica. The largest amounts of gold on Earth are found in the oceans - but it is not yet feasible to extract gold from seawater.
[19] The soft silvery metalic element which ionizes easily when heated or exposed to light and is present in atomic clocks is –
A.
Cerium
B.
Cesium
C.
Calcium
D.
Californium
Ans:
Cesium
Explanation :
1967, based on Einstein defining the speed of light as the most constant dimension in the universe, the International System of Units isolated two specific wave counts from an emission spectrum of caesium- 133 to codefine the second and the meter. Since then, caesium has been widely used in highly accurate atomic clocks. Among alkali metals, cesium has lowest ionization energy and hence it can show photoelectric effect to the maximum extent.
[20] Catalytic converters are generally made from –
A.
Alkaline metals
B.
Hydrogen
C.
Transition metals
D.
Carbon
Ans:
Transition metals
Explanation :
Transition metals are used directly as catalysts in the anti-pollution catalytic converters in car exhausts. For example, expensive transition metals such as Platinum and rhodium are used in the catalytic converters in car exhausts to reduce the emission of carbon monoxide and nitrogen monoxide, which are converted to the non-polluting gases nitrogen and carbon dioxide.
[21] In galvanization, iron is coated with –
A.
Copper
B.
Zinc
C.
Tin
D.
Nickel
Ans:
Zinc
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanization, in which parts are submerged in a bath of molten zinc.
[22] Which one of the folling is also khow as solution?
A.
Acompound
B.
Ahomogeneous mixture
C.
A heterogeneous mixture
D.
A suspension
Ans:
Ahomogeneous mixture
Explanation :
In chemistry, a solution is a homogeneous mixture composed of only one phase. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent. The solution more or less takes on the characteristics of the solvent including its phase.
[23] Which of the following is very reactive and kept in kerosene?
A.
Sodium
B.
Potassium
C.
Iodine
D.
Bromine
Ans:
Sodium
Explanation :
Sodium is a very reactive metal. It reacts vigorously with oxygen and water. A lot of heat is generated in this process. Therefore, it is stored in kerosene to avoid contacts between either atmospheric oxygen or water.
[24] Which one of the following is known as the ‘brown coal’?
A.
Anthracite
B.
Bituminous
C.
Coke
D.
Lignite
Ans:
Lignite
Explanation :
Lignite, often referred to as brown coal, is a soft brown fuel with characteristics that put it somewhere between coal and peat. It is considered the lowest rank of coal. It has a carbon content of around 25- 30%.
[25] The chief source of naphthalene is -
A.
Coal-tar
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tar
Explanation :
Naphthalene is derived from a kind of naphtha which is a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar.
Explanation :
Anthracite is the highest rank of coal. It is the most metamorphosed type of coal, in which the carbon content is between 92.1% and 98%. Anthracite coal generally has the highest heating value per ton on a mineral-matter-free basis. Anthracite is often referred to as hard coal.
[16] Which of the following is not a commercial source of energy?
A.
Coal
B.
Petroleum
C.
Natural Gas
D.
Firewood
Ans:
Firewood
Explanation :
Firewood, agricultural waste (straw, etc.) and animals waste (cowdung) are the important components of non-commercial energy. It is generally used in the rural area for domestic purposes— mainly cooking. Coal, petroleum products, natural gas and, electricity are the important components of commercial energy.
[17] Which one of the following substances does not have a melting point?
A.
Bromine
B.
Sodium chloride
C.
Mercury
D.
Glass
Ans:
Mercury
Explanation :
The boiling point is the temperature at which a material changes from a liquid to a gas (boils) while the melting point is the temperature at which a material changes from a solid to a liquid (melts).
[18] Which one of the following metals occurs in nature in free state?
A.
Gold
B.
Sodium
C.
Aluminium
D.
Copper
Ans:
Gold
Explanation :
Gold is found on every continent on Earth, except Antarctica. The largest amounts of gold on Earth are found in the oceans - but it is not yet feasible to extract gold from seawater.
[19] The soft silvery metalic element which ionizes easily when heated or exposed to light and is present in atomic clocks is –
A.
Cerium
B.
Cesium
C.
Calcium
D.
Californium
Ans:
Cesium
Explanation :
1967, based on Einstein defining the speed of light as the most constant dimension in the universe, the International System of Units isolated two specific wave counts from an emission spectrum of caesium- 133 to codefine the second and the meter. Since then, caesium has been widely used in highly accurate atomic clocks. Among alkali metals, cesium has lowest ionization energy and hence it can show photoelectric effect to the maximum extent.
[20] Catalytic converters are generally made from –
A.
Alkaline metals
B.
Hydrogen
C.
Transition metals
D.
Carbon
Ans:
Transition metals
Explanation :
Transition metals are used directly as catalysts in the anti-pollution catalytic converters in car exhausts. For example, expensive transition metals such as Platinum and rhodium are used in the catalytic converters in car exhausts to reduce the emission of carbon monoxide and nitrogen monoxide, which are converted to the non-polluting gases nitrogen and carbon dioxide.
[21] In galvanization, iron is coated with –
A.
Copper
B.
Zinc
C.
Tin
D.
Nickel
Ans:
Zinc
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanization, in which parts are submerged in a bath of molten zinc.
[22] Which one of the folling is also khow as solution?
A.
Acompound
B.
Ahomogeneous mixture
C.
A heterogeneous mixture
D.
A suspension
Ans:
Ahomogeneous mixture
Explanation :
In chemistry, a solution is a homogeneous mixture composed of only one phase. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent. The solution more or less takes on the characteristics of the solvent including its phase.
[23] Which of the following is very reactive and kept in kerosene?
A.
Sodium
B.
Potassium
C.
Iodine
D.
Bromine
Ans:
Sodium
Explanation :
Sodium is a very reactive metal. It reacts vigorously with oxygen and water. A lot of heat is generated in this process. Therefore, it is stored in kerosene to avoid contacts between either atmospheric oxygen or water.
[24] Which one of the following is known as the ‘brown coal’?
A.
Anthracite
B.
Bituminous
C.
Coke
D.
Lignite
Ans:
Lignite
Explanation :
Lignite, often referred to as brown coal, is a soft brown fuel with characteristics that put it somewhere between coal and peat. It is considered the lowest rank of coal. It has a carbon content of around 25- 30%.
[25] The chief source of naphthalene is -
A.
Coal-tar
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tar
Explanation :
Naphthalene is derived from a kind of naphtha which is a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar.
Explanation :
The boiling point is the temperature at which a material changes from a liquid to a gas (boils) while the melting point is the temperature at which a material changes from a solid to a liquid (melts).
[18] Which one of the following metals occurs in nature in free state?
A.
Gold
B.
Sodium
C.
Aluminium
D.
Copper
Ans:
Gold
Explanation :
Gold is found on every continent on Earth, except Antarctica. The largest amounts of gold on Earth are found in the oceans - but it is not yet feasible to extract gold from seawater.
[19] The soft silvery metalic element which ionizes easily when heated or exposed to light and is present in atomic clocks is –
A.
Cerium
B.
Cesium
C.
Calcium
D.
Californium
Ans:
Cesium
Explanation :
1967, based on Einstein defining the speed of light as the most constant dimension in the universe, the International System of Units isolated two specific wave counts from an emission spectrum of caesium- 133 to codefine the second and the meter. Since then, caesium has been widely used in highly accurate atomic clocks. Among alkali metals, cesium has lowest ionization energy and hence it can show photoelectric effect to the maximum extent.
[20] Catalytic converters are generally made from –
A.
Alkaline metals
B.
Hydrogen
C.
Transition metals
D.
Carbon
Ans:
Transition metals
Explanation :
Transition metals are used directly as catalysts in the anti-pollution catalytic converters in car exhausts. For example, expensive transition metals such as Platinum and rhodium are used in the catalytic converters in car exhausts to reduce the emission of carbon monoxide and nitrogen monoxide, which are converted to the non-polluting gases nitrogen and carbon dioxide.
[21] In galvanization, iron is coated with –
A.
Copper
B.
Zinc
C.
Tin
D.
Nickel
Ans:
Zinc
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanization, in which parts are submerged in a bath of molten zinc.
[22] Which one of the folling is also khow as solution?
A.
Acompound
B.
Ahomogeneous mixture
C.
A heterogeneous mixture
D.
A suspension
Ans:
Ahomogeneous mixture
Explanation :
In chemistry, a solution is a homogeneous mixture composed of only one phase. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent. The solution more or less takes on the characteristics of the solvent including its phase.
[23] Which of the following is very reactive and kept in kerosene?
A.
Sodium
B.
Potassium
C.
Iodine
D.
Bromine
Ans:
Sodium
Explanation :
Sodium is a very reactive metal. It reacts vigorously with oxygen and water. A lot of heat is generated in this process. Therefore, it is stored in kerosene to avoid contacts between either atmospheric oxygen or water.
[24] Which one of the following is known as the ‘brown coal’?
A.
Anthracite
B.
Bituminous
C.
Coke
D.
Lignite
Ans:
Lignite
Explanation :
Lignite, often referred to as brown coal, is a soft brown fuel with characteristics that put it somewhere between coal and peat. It is considered the lowest rank of coal. It has a carbon content of around 25- 30%.
[25] The chief source of naphthalene is -
A.
Coal-tar
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tar
Explanation :
Naphthalene is derived from a kind of naphtha which is a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar.
Explanation :
1967, based on Einstein defining the speed of light as the most constant dimension in the universe, the International System of Units isolated two specific wave counts from an emission spectrum of caesium- 133 to codefine the second and the meter. Since then, caesium has been widely used in highly accurate atomic clocks. Among alkali metals, cesium has lowest ionization energy and hence it can show photoelectric effect to the maximum extent.
[20] Catalytic converters are generally made from –
A.
Alkaline metals
B.
Hydrogen
C.
Transition metals
D.
Carbon
Ans:
Transition metals
Explanation :
Transition metals are used directly as catalysts in the anti-pollution catalytic converters in car exhausts. For example, expensive transition metals such as Platinum and rhodium are used in the catalytic converters in car exhausts to reduce the emission of carbon monoxide and nitrogen monoxide, which are converted to the non-polluting gases nitrogen and carbon dioxide.
[21] In galvanization, iron is coated with –
A.
Copper
B.
Zinc
C.
Tin
D.
Nickel
Ans:
Zinc
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanization, in which parts are submerged in a bath of molten zinc.
[22] Which one of the folling is also khow as solution?
A.
Acompound
B.
Ahomogeneous mixture
C.
A heterogeneous mixture
D.
A suspension
Ans:
Ahomogeneous mixture
Explanation :
In chemistry, a solution is a homogeneous mixture composed of only one phase. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent. The solution more or less takes on the characteristics of the solvent including its phase.
[23] Which of the following is very reactive and kept in kerosene?
A.
Sodium
B.
Potassium
C.
Iodine
D.
Bromine
Ans:
Sodium
Explanation :
Sodium is a very reactive metal. It reacts vigorously with oxygen and water. A lot of heat is generated in this process. Therefore, it is stored in kerosene to avoid contacts between either atmospheric oxygen or water.
[24] Which one of the following is known as the ‘brown coal’?
A.
Anthracite
B.
Bituminous
C.
Coke
D.
Lignite
Ans:
Lignite
Explanation :
Lignite, often referred to as brown coal, is a soft brown fuel with characteristics that put it somewhere between coal and peat. It is considered the lowest rank of coal. It has a carbon content of around 25- 30%.
[25] The chief source of naphthalene is -
A.
Coal-tar
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tar
Explanation :
Naphthalene is derived from a kind of naphtha which is a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar.
Explanation :
Galvanization is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanization, in which parts are submerged in a bath of molten zinc.
[22] Which one of the folling is also khow as solution?
A.
Acompound
B.
Ahomogeneous mixture
C.
A heterogeneous mixture
D.
A suspension
Ans:
Ahomogeneous mixture
Explanation :
In chemistry, a solution is a homogeneous mixture composed of only one phase. In such a mixture, a solute is a substance dissolved in another substance, known as a solvent. The solution more or less takes on the characteristics of the solvent including its phase.
[23] Which of the following is very reactive and kept in kerosene?
A.
Sodium
B.
Potassium
C.
Iodine
D.
Bromine
Ans:
Sodium
Explanation :
Sodium is a very reactive metal. It reacts vigorously with oxygen and water. A lot of heat is generated in this process. Therefore, it is stored in kerosene to avoid contacts between either atmospheric oxygen or water.
[24] Which one of the following is known as the ‘brown coal’?
A.
Anthracite
B.
Bituminous
C.
Coke
D.
Lignite
Ans:
Lignite
Explanation :
Lignite, often referred to as brown coal, is a soft brown fuel with characteristics that put it somewhere between coal and peat. It is considered the lowest rank of coal. It has a carbon content of around 25- 30%.
[25] The chief source of naphthalene is -
A.
Coal-tar
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tar
Explanation :
Naphthalene is derived from a kind of naphtha which is a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar.
Explanation :
Sodium is a very reactive metal. It reacts vigorously with oxygen and water. A lot of heat is generated in this process. Therefore, it is stored in kerosene to avoid contacts between either atmospheric oxygen or water.
[24] Which one of the following is known as the ‘brown coal’?
A.
Anthracite
B.
Bituminous
C.
Coke
D.
Lignite
Ans:
Lignite
Explanation :
Lignite, often referred to as brown coal, is a soft brown fuel with characteristics that put it somewhere between coal and peat. It is considered the lowest rank of coal. It has a carbon content of around 25- 30%.
[25] The chief source of naphthalene is -
A.
Coal-tar
B.
Diesel
C.
Charcoal
D.
Camphor
Ans:
Coal-tar
Explanation :
Naphthalene is derived from a kind of naphtha which is a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar.
Explanation :
Naphthalene is derived from a kind of naphtha which is a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar.