CHM 1. The father of modern chemistry is ______?
A. Priestley
B. Lavoisier
C. Dalton
D. Mendeleeff
Ans: B
Antoine Lavoisier was a French nobleman and chemist central to the 18th-century chemical revolution and a large influence on both the history of chemistry and the history of biology. He is widely considered in popular literature as the "father of modern chemistry".
CHM 2. Which one is not metal_____?
A. sulphar
B. sugar
C. nitrogen
D. all
Ans: All
A metal is a material (an element, compound, or alloy) that is typically hard, opaque, shiny and has good electrical and thermal conductivity.
CHM 3. Which one is the pure element______?
A. glass
B. cement
C. sodium
D. none of these
Ans: C
A pure element is a chemical element consisting of only one stable isotope.
CHM 4. What is the elements present in urea______?
A. C,H,O
B. C,N,O
C. C,N,H
D. C,O,N,H
Ans: D
Urea is an organic compound with the chemical formula CO(NH₂)₂. The molecule has two —NH₂ groups joined by a carbonyl (C=O) functional group.
CHM 5. A radioactive substance emits______?
A. alpha particle
B. beta particle
C. gamma particle
D. all of the three
Ans: All of the three
Radioactive substances are continually producing three kinds of dangerous radiation: alpha particles, beta particles and gamma rays. These types of radiation are invisible to the naked eye, and so you won't see a green glow.
CHM 6. The fuel in atomic pile is?
A. carbon
B. sodium
C. petroleum
D. uranium
Ans: D
In the pile, the neutron-producing uranium pellets were separated from one another by graphite blocks. Some of the free neutrons produced by the natural decay of uranium would be absorbed by other uranium atoms, causing nuclear fission of those atoms and the release of additional free neutrons.
CHM 7. Which of the following is the lightest metal?
A. Mercury
B. Silver
C. Lithium
D. Lead
Ans: C
The lightest or least dense metal that is a pure element is lithium, which has a density of 0.534 g/cm3. This makes lithium nearly half as dense as water, so if lithium was not so reactive, a chunk of the metal would float on water.
CHM 8. The element present in the largest amount in rocks and minerals is_____?
A. carbon
B. silicon
C. hydrogen
D. aluminium
Ans: B
Silicon is the eighth most common element in the universe by mass, but very rarely occurs as the pure free element in nature. It is most widely distributed in dusts, sands, planetoids, and planets as various forms of silicon dioxide (silica) or silicates. Over 90% of the Earth's crust is composed of silicate minerals, making silicon the second most abundant element in the Earth's crust after oxygen.
CHM 9. German silver is an alloy of_______?
A. copper, nickel and silver
B. silver, copper and aluminium
C. zinc, copper and nickel
D. silver, zinc and copper
Ans: C
German silver is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc.
CHM 10. The inert gas abundantly found in widely distributed is_____?
A. Xe
B. Kr
C. He
D. Ar
Ans: D
Argon (Ar) is the most prevalent of the noble gases in Earth's crust with the element composing 0.00015% of this crust.
CHM 11. Vinegar is used as a condiment, and in the pickling of vegetables and other foods. What is the constituent of vinegar?
A. Butanoic acid
B. Methanoic acid
C. Ethanoic acid
D. Hexanoic acid
Ans: C
When ethanol reacts with oxygen it forms a weak acid called ethanoic acid. In an open bottle of beer or wine, the reaction happens naturally in the presence of bacteria, and it is the ethanoic acid that can make beer or wine taste sour. Vinegar is typically 4-18% acetic acid by mass. Vinegar is used directly as a condiment, and in the pickling of vegetables and other foods
CHM 12. Which one of the following is correct? Setting of plaster of Paris is _____.
A. dehydration
B. oxidation with atmospheric oxygen
C. hydration leading to another hydrate
D. combination with atmospheric carbon dioxide
Ans: D
To make lime plaster, limestone (calcium carbonate) is heated to produce quicklime (calcium oxide). Water is then added to produce slaked lime, which is sold as a wet putty. Additional water is added to form a paste prior to use. The paste may be stored in airtight containers. When exposed to the atmosphere, the calcium hydroxide very slowly turns back into calcium carbonate through reaction with atmospheric carbon dioxide, causing the plaster to increase in strength.
CHM 13. Which of the following is the best conductor of electricity?
A. Ordinary water
B. Sea water
C. Boiled water
D. Distilled water
Ans: B
Sea water is a "good" conductor. It has a resistance and resistance increases by distance. So if you dip a very high voltage electric wire in the ocean, the area around it (even 100 meters or more based on how high it is) gets electric.
CHM 14. Which one among the following substances evolved heat when dissolved in water?
A. Glucose
B. Fructose
C. Quick lime
D. Salt peter
Ans: C
Quicklime is a widely used chemical compound. It is a white, caustic, alkaline, crystalline solid at room temperature. When limestone is heated, atabout 10000 C it undergoes thermal decomposition.
It loses carbon dioxide and turns into quicklime (calcium oxide).
CHM 15. Which one among the following polymers is used for making bullet-proof material?
A. Polyvinyl chloride
B. Polystyrene
C. Polyethylene
D. Polyamide
Ans: C
A bullet-proof material is made of polyethylene. It is a higher grade of the plastic found in Tupperware.
CHM 16. Hydrogen was discovered by______?
A. Cavendish
B. Lavosier
C. Rutherford
D. Scheele
Ans: A
In 1766, Henry Cavendish was the first to recognize hydrogen gas as a discrete substance, by naming the gas from a metal-acid reaction "flammable air".
CHM 17. Carbon reacts with metal to form____.
A. Carbide
B. Carbonate
C. Hydroxide
D. Oxide
Ans: A
Carbon reacts with reactive metals, such as tungsten, carbon forms either carbides to form alloys with high melting points.
CHM 18. Which one of the following elements is metalloid?
A. Si
B. Pb
C. Ge
D. C
Ans: C
A metalloid is a chemical element with properties in between metals and nonmetals. Germanium (Ge) is a chemical element. It is a lustrous, hard, grayish-white metalloid in the carbon group.
CHM 19. Which one of the following is used in the preparation of antiseptic solution?
A. Potassium nitrate
B. Iodine
C. Iodine chloride
D. Potassium chloride
Ans: B
Antiseptics are chemical agents that slow or stop the growth of micro-organisms (germs) on external surfaces of the body and help prevent infections.
CHM 20. The name catalysis was given by______.
A. Ratherford
B. landmuir
C. Grahm
D. Berzelius
Ans: B
Catalysis is the increase in the rate of a chemical reaction due to the participation of an additional substance called a catalyst. With a catalyst, reactions occur faster and with less energy. Because catalysts are not consumed, they are recycled. Often only tiny amounts are required.
CHM 21. Which of the following is not a natural polymer?
A. Wool
B. Silk
C. Cotton
D. Teflon
Ans: D
Natural polymers occur in nature and can be extracted. They are often water-based. Examples of naturally occurring polymers are silk, wool, DNA, cellulose,cotton and proteins.
CHM 22. Gamma rays are_____.
A. High energy electrons
B. Low energy electrons
C. High energy electromagnetic
D. High energy positron waves
Ans: C
Gamma rays (γ) refer to electromagnetic radiation of an extremely high frequency and therefore consist of high-energy photons.
CHM 23. The ultrapure metal is obtained by________?
A. Calcination
B. Sublimation
C. zone refining
D. None of these
Ans: C
The principal stages in the production of ultrapure metals are the preparation of pure chemical compounds, the reduction of the compounds to the elementary state and further purification. Pure compounds are obtained by sorption, extraction, distillation, rectification, ion exchange, and recrystallization from aqueous solutions
CHM 24. The gas used in a refrigerator is_______?
A. cooled down on flowing
B. heated up on flowing
C. cooled down when compressed
D. cooled down when expanded
Ans: D
Common refrigerants used in various applications are ammonia, sulfur dioxide, and non-halogenated hydrocarbons such as propane. Compressing these gasses into liquids they are made to give up their heat.
CHM 25. Which one of the following petroleum refinery products has the lowest boiling point?
A. Kerosene
B. Gasoline
C. Diesel
D. Lubricating oil
Ans: D
Lubricating oil is the most commonly used lubricant because of its wide range of possible applications. The two basic categories of lube oil are mineral and synthetic. Mineral oils are refined from naturally occurring petroleum, or crude oil. Synthetic oils are manufactured polyalphaolefins, which are hydrocarbon-based polyglycols or ester oils.
CHM 26. Compound having tetrahedral structure is _____.
A. C2H4
B. C2H2
C. CH4
D. None of these
Ans: C
Methane is a tetrahedral molecule with four equivalent C-H bonds. Its electronic structure is described by four bonding molecular orbitals resulting from the overlap of the valence orbitals on C and H.
CHM 27. The constant temperature, the product of pressure and volume of a given amount of a gas is constant . This is______.
A. Gay-Lussac law
B. Charles’s law
C. Boyle’s law
D. Pressure law
Ans: C
Boyle's law is a gas law, stating that the pressure and volume of a gas have an inverse relationship, when temperature is held constant. If volume increases, then pressure decreases and vice versa when temperature is held constant.
CHM 28. Modern periodic law had been given by ____.
A. Moseley
B. Mendeleev
C. Lother-Mayer
D. Lavoisier
Ans: A
In 1913, H.G.J Moseley in England proved that the more fundamental properties of an element are its atomic number. Therefore he suggested that the basis of classification of elements should be atomic number.
CHM 29. In Nuclear reactors graphite is used as______.
A. Lubricant
B. Fuel
C. Linear of the reactor
D. Modulator
Ans: D
Nuclear reactors are used at nuclear power plants for electricity generation .These are generally graphite moderated and CO2 cooled.
CHM 30. An acid is a substance which ____.
A. Donates a proton
B. Accepts an electron
C. Give H+ in water
D. All
Ans: D
An acid is a chemical substance whose aqueous solutions are characterized by a sour taste, the ability to turn blue litmus red and the ability to react with bases and certain metals to form salts.
CHM 31. A mixture of carbon monoxide and hydrogen is called______.
A. Producer gas
B. Water gas
C. Natural gas
D. None
Ans: B
Water gas is a synthesis gas, containing carbon monoxide and hydrogen. It is a useful product but requires careful handling due to its flammability and the risk of carbon monoxide poisoning. The gas is made by passing steam over a red-hot carbon fuel such as coke.
CHM 32. The compound of a metal found in nature is called______.
A. Mineral
B. Ore
C. Flux
D. Slag
Ans: A
Metals are an integral part of our planet and are found in almost all rocks and soils. Most metals form compounds called minerals, which are naturally occurring, inorganic solids with regular chemical compositions and crystal structures.
CHM 33. Freon is used as____.
A. Oxidant
B. Refrigerant
C. Catalyst
D. Both A and B
Ans: B
Freon uses for a number of halocarbon products. They are stable, nonflammable, moderately toxic gases or liquids which have typically been used as refrigerants and as aerosol propellants.
CHM 34. Which gas is used in filling electric bulbs____.
A. Neon
B. Argon
C. Radon
D. Krypton
Ans: B
Argon is used to fill incandescent light bulbs to inhibit the evaporation of the tungsten filaments and increase bulb life.
CHM 35. Lead pencil contains_____.
A. Lead nitrate
B. Graphite
C. Lead peroxide
D. Lead Sulphate
Ans: B
Most pencil cores are made of graphite mixed with a clay binder which leaves grey or black marks that can be easily erased.
CHM 36. Air is____?
A. Compound
B. Element
C. Mixture
D. Solution
Ans: C
Pure air is a mixture of several gases that are invisible and clourless. It consists of about 78% nitrogen, 21% oxygen, and less than 1% of argon, carbon dioxide and other gases, as well as varying amounts of water vapour.
CHM 37. Which of the following is a noble gas______?
A. Argon
B. Hydrogen
C. Oxygen
D. Nitrogen
Ans: A
Noble gas ,any of the seven chemical elements that make up Group 18 (VIIIa) of the periodictable. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn).
CHM 38. Study of old age is called_________?
A. Gerantalogy
B. Pedology
C. Ornithology
D. Anthropology
Ans: A
Gerontology is the study of the aging process itself. Geriatrics is sometimes called medical gerontology.
CHM 39. The chemical name for common salt______.
A. Sodium chloride
B. Sodium hydroxide
C. Sodium chlorate
D. Potasium chloride
Ans: A
Sodium chloride is also known common salt is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions.
CHM 40. Liquid metal is______?
A. Mercury
B. Sodium
C. Antimony
D. None
Ans: A
Liquid metal consists of gallium-containing alloys with very low melting points which are liquid at room temperature. The standard metal formerly is mercury.
CHM 41. Match sticks are made of____?
A. Red phosphorus
B. blue phosphorus
C. led nitrate
D. None
Ans: A
Red phosphorus is used in matches. Ferrophosphorus, a combination of phosphorus with iron, is used as an ingredient in high-strength low-alloy steel.
CHM 42. Chemical that is used in photography______?
A. Copper sulphate
B. Silver bromide
C. Magnesium sulphate
D. None
Ans: B
Silver bromide (AgBr) is a soft pale-yellow, water-insoluble salt well for its unusual sensitivity to light. This property has allowed silver halides to become the basis of modern photographic materials. AgBr is widely used in photographic films and is believed by some to have been used for making the Shroud of Turin.
CHM 43. ‘Plaster of pans’ chemically known as______.
A. Sodium Aluminate
B. Calcium sulphate
C. Spdium bicarbonate
D. Sodium acetate
Ans: B
Calcium sulphate is a calcium salt that is used for a variety of purposes. It exists in various forms and states of hydration. Plaster of Paris is a mixture of powdered and heat-treated gypsum.
CHM 44. When iron rusts, its weight________?
A. decreases
B. increases
C. Constant
D. None
Ans: B
Iron rust when they come into contact with water and oxygen. They rust faster in salty water or acid rain.
CHM 45. Which is not a type of elements?
A. Metals
B. Non Metals
C. Metalloids
D. Gases
Ans: C
Element is a chemical substance consisting of atoms having the same number of protons in their atomic nuclei.
There are 118 elements that have been identified. The elements classified as metalloids are boron, silicon, germanium, arsenic, antimony, tellurium and polonium.
CHM 46. Which acid is present in lemon?
A. marlic acid
B. citric acid
C. lactic acid
D. tartaric acid
Ans: B
Citric acid is a weak organic acid with the formula C6H8O7.The juice of the lemon is about 5% to 6% citric acid, which gives a sour taste.
CHM 47. What among following is used to produce artificial rain?
A. copper oxide
B. carbon monoxide
C. silver iodide
D. silver nitrate
Ans: C
Artificial rain is produced by spraying clouds with substances like Silver Iodide (costly) or cheaper ones like solid carbon dioxide (dry ice) or even finely powdered Sodium Chloride.
CHM 48. Which is used in preparation of dynamite?
A. glycerol
B. ethyl alcohol
C. methyl alcohol
D. glycol
Ans: A
Dynamite is an explosive material based on nitroglycerin, using diatomaceous earth or another adsorbent substance such as powdered shells or clay
CHM 49. Nail polish remover contains?
A. benzene
B. acetic acid
C. acetone
D. petroleum ether
Ans: C
The most common solvents are acetone. It is powerful and effective but can be harsh on skin and nails. Acetonitrile has been used as a nail polish remover.
CHM 50. Human bone does not contain________.
A. calcium
B. carbon
C. oxygen
D. phosphorous
Ans: C
Human Bones are primarily formed from salts of calcium, carbon and phosphate, the major salt being hydroxyapatite.
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A. Priestley
B. Lavoisier
C. Dalton
D. Mendeleeff
Ans: B
Antoine Lavoisier was a French nobleman and chemist central to the 18th-century chemical revolution and a large influence on both the history of chemistry and the history of biology. He is widely considered in popular literature as the "father of modern chemistry".
CHM 2. Which one is not metal_____?
A. sulphar
B. sugar
C. nitrogen
D. all
Ans: All
A metal is a material (an element, compound, or alloy) that is typically hard, opaque, shiny and has good electrical and thermal conductivity.
CHM 3. Which one is the pure element______?
A. glass
B. cement
C. sodium
D. none of these
Ans: C
A pure element is a chemical element consisting of only one stable isotope.
CHM 4. What is the elements present in urea______?
A. C,H,O
B. C,N,O
C. C,N,H
D. C,O,N,H
Ans: D
Urea is an organic compound with the chemical formula CO(NH₂)₂. The molecule has two —NH₂ groups joined by a carbonyl (C=O) functional group.
CHM 5. A radioactive substance emits______?
A. alpha particle
B. beta particle
C. gamma particle
D. all of the three
Ans: All of the three
Radioactive substances are continually producing three kinds of dangerous radiation: alpha particles, beta particles and gamma rays. These types of radiation are invisible to the naked eye, and so you won't see a green glow.
CHM 6. The fuel in atomic pile is?
A. carbon
B. sodium
C. petroleum
D. uranium
Ans: D
In the pile, the neutron-producing uranium pellets were separated from one another by graphite blocks. Some of the free neutrons produced by the natural decay of uranium would be absorbed by other uranium atoms, causing nuclear fission of those atoms and the release of additional free neutrons.
CHM 7. Which of the following is the lightest metal?
A. Mercury
B. Silver
C. Lithium
D. Lead
Ans: C
The lightest or least dense metal that is a pure element is lithium, which has a density of 0.534 g/cm3. This makes lithium nearly half as dense as water, so if lithium was not so reactive, a chunk of the metal would float on water.
CHM 8. The element present in the largest amount in rocks and minerals is_____?
A. carbon
B. silicon
C. hydrogen
D. aluminium
Ans: B
Silicon is the eighth most common element in the universe by mass, but very rarely occurs as the pure free element in nature. It is most widely distributed in dusts, sands, planetoids, and planets as various forms of silicon dioxide (silica) or silicates. Over 90% of the Earth's crust is composed of silicate minerals, making silicon the second most abundant element in the Earth's crust after oxygen.
CHM 9. German silver is an alloy of_______?
A. copper, nickel and silver
B. silver, copper and aluminium
C. zinc, copper and nickel
D. silver, zinc and copper
Ans: C
German silver is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc.
CHM 10. The inert gas abundantly found in widely distributed is_____?
A. Xe
B. Kr
C. He
D. Ar
Ans: D
Argon (Ar) is the most prevalent of the noble gases in Earth's crust with the element composing 0.00015% of this crust.
CHM 11. Vinegar is used as a condiment, and in the pickling of vegetables and other foods. What is the constituent of vinegar?
A. Butanoic acid
B. Methanoic acid
C. Ethanoic acid
D. Hexanoic acid
Ans: C
When ethanol reacts with oxygen it forms a weak acid called ethanoic acid. In an open bottle of beer or wine, the reaction happens naturally in the presence of bacteria, and it is the ethanoic acid that can make beer or wine taste sour. Vinegar is typically 4-18% acetic acid by mass. Vinegar is used directly as a condiment, and in the pickling of vegetables and other foods
CHM 12. Which one of the following is correct? Setting of plaster of Paris is _____.
A. dehydration
B. oxidation with atmospheric oxygen
C. hydration leading to another hydrate
D. combination with atmospheric carbon dioxide
Ans: D
To make lime plaster, limestone (calcium carbonate) is heated to produce quicklime (calcium oxide). Water is then added to produce slaked lime, which is sold as a wet putty. Additional water is added to form a paste prior to use. The paste may be stored in airtight containers. When exposed to the atmosphere, the calcium hydroxide very slowly turns back into calcium carbonate through reaction with atmospheric carbon dioxide, causing the plaster to increase in strength.
CHM 13. Which of the following is the best conductor of electricity?
A. Ordinary water
B. Sea water
C. Boiled water
D. Distilled water
Ans: B
Sea water is a "good" conductor. It has a resistance and resistance increases by distance. So if you dip a very high voltage electric wire in the ocean, the area around it (even 100 meters or more based on how high it is) gets electric.
CHM 14. Which one among the following substances evolved heat when dissolved in water?
A. Glucose
B. Fructose
C. Quick lime
D. Salt peter
Ans: C
Quicklime is a widely used chemical compound. It is a white, caustic, alkaline, crystalline solid at room temperature. When limestone is heated, atabout 10000 C it undergoes thermal decomposition.
It loses carbon dioxide and turns into quicklime (calcium oxide).
CHM 15. Which one among the following polymers is used for making bullet-proof material?
A. Polyvinyl chloride
B. Polystyrene
C. Polyethylene
D. Polyamide
Ans: C
A bullet-proof material is made of polyethylene. It is a higher grade of the plastic found in Tupperware.
CHM 16. Hydrogen was discovered by______?
A. Cavendish
B. Lavosier
C. Rutherford
D. Scheele
Ans: A
In 1766, Henry Cavendish was the first to recognize hydrogen gas as a discrete substance, by naming the gas from a metal-acid reaction "flammable air".
CHM 17. Carbon reacts with metal to form____.
A. Carbide
B. Carbonate
C. Hydroxide
D. Oxide
Ans: A
Carbon reacts with reactive metals, such as tungsten, carbon forms either carbides to form alloys with high melting points.
CHM 18. Which one of the following elements is metalloid?
A. Si
B. Pb
C. Ge
D. C
Ans: C
A metalloid is a chemical element with properties in between metals and nonmetals. Germanium (Ge) is a chemical element. It is a lustrous, hard, grayish-white metalloid in the carbon group.
CHM 19. Which one of the following is used in the preparation of antiseptic solution?
A. Potassium nitrate
B. Iodine
C. Iodine chloride
D. Potassium chloride
Ans: B
Antiseptics are chemical agents that slow or stop the growth of micro-organisms (germs) on external surfaces of the body and help prevent infections.
CHM 20. The name catalysis was given by______.
A. Ratherford
B. landmuir
C. Grahm
D. Berzelius
Ans: B
Catalysis is the increase in the rate of a chemical reaction due to the participation of an additional substance called a catalyst. With a catalyst, reactions occur faster and with less energy. Because catalysts are not consumed, they are recycled. Often only tiny amounts are required.
CHM 21. Which of the following is not a natural polymer?
A. Wool
B. Silk
C. Cotton
D. Teflon
Ans: D
Natural polymers occur in nature and can be extracted. They are often water-based. Examples of naturally occurring polymers are silk, wool, DNA, cellulose,cotton and proteins.
CHM 22. Gamma rays are_____.
A. High energy electrons
B. Low energy electrons
C. High energy electromagnetic
D. High energy positron waves
Ans: C
Gamma rays (γ) refer to electromagnetic radiation of an extremely high frequency and therefore consist of high-energy photons.
CHM 23. The ultrapure metal is obtained by________?
A. Calcination
B. Sublimation
C. zone refining
D. None of these
Ans: C
The principal stages in the production of ultrapure metals are the preparation of pure chemical compounds, the reduction of the compounds to the elementary state and further purification. Pure compounds are obtained by sorption, extraction, distillation, rectification, ion exchange, and recrystallization from aqueous solutions
CHM 24. The gas used in a refrigerator is_______?
A. cooled down on flowing
B. heated up on flowing
C. cooled down when compressed
D. cooled down when expanded
Ans: D
Common refrigerants used in various applications are ammonia, sulfur dioxide, and non-halogenated hydrocarbons such as propane. Compressing these gasses into liquids they are made to give up their heat.
CHM 25. Which one of the following petroleum refinery products has the lowest boiling point?
A. Kerosene
B. Gasoline
C. Diesel
D. Lubricating oil
Ans: D
Lubricating oil is the most commonly used lubricant because of its wide range of possible applications. The two basic categories of lube oil are mineral and synthetic. Mineral oils are refined from naturally occurring petroleum, or crude oil. Synthetic oils are manufactured polyalphaolefins, which are hydrocarbon-based polyglycols or ester oils.
CHM 26. Compound having tetrahedral structure is _____.
A. C2H4
B. C2H2
C. CH4
D. None of these
Ans: C
Methane is a tetrahedral molecule with four equivalent C-H bonds. Its electronic structure is described by four bonding molecular orbitals resulting from the overlap of the valence orbitals on C and H.
CHM 27. The constant temperature, the product of pressure and volume of a given amount of a gas is constant . This is______.
A. Gay-Lussac law
B. Charles’s law
C. Boyle’s law
D. Pressure law
Ans: C
Boyle's law is a gas law, stating that the pressure and volume of a gas have an inverse relationship, when temperature is held constant. If volume increases, then pressure decreases and vice versa when temperature is held constant.
CHM 28. Modern periodic law had been given by ____.
A. Moseley
B. Mendeleev
C. Lother-Mayer
D. Lavoisier
Ans: A
In 1913, H.G.J Moseley in England proved that the more fundamental properties of an element are its atomic number. Therefore he suggested that the basis of classification of elements should be atomic number.
CHM 29. In Nuclear reactors graphite is used as______.
A. Lubricant
B. Fuel
C. Linear of the reactor
D. Modulator
Ans: D
Nuclear reactors are used at nuclear power plants for electricity generation .These are generally graphite moderated and CO2 cooled.
CHM 30. An acid is a substance which ____.
A. Donates a proton
B. Accepts an electron
C. Give H+ in water
D. All
Ans: D
An acid is a chemical substance whose aqueous solutions are characterized by a sour taste, the ability to turn blue litmus red and the ability to react with bases and certain metals to form salts.
CHM 31. A mixture of carbon monoxide and hydrogen is called______.
A. Producer gas
B. Water gas
C. Natural gas
D. None
Ans: B
Water gas is a synthesis gas, containing carbon monoxide and hydrogen. It is a useful product but requires careful handling due to its flammability and the risk of carbon monoxide poisoning. The gas is made by passing steam over a red-hot carbon fuel such as coke.
CHM 32. The compound of a metal found in nature is called______.
A. Mineral
B. Ore
C. Flux
D. Slag
Ans: A
Metals are an integral part of our planet and are found in almost all rocks and soils. Most metals form compounds called minerals, which are naturally occurring, inorganic solids with regular chemical compositions and crystal structures.
CHM 33. Freon is used as____.
A. Oxidant
B. Refrigerant
C. Catalyst
D. Both A and B
Ans: B
Freon uses for a number of halocarbon products. They are stable, nonflammable, moderately toxic gases or liquids which have typically been used as refrigerants and as aerosol propellants.
CHM 34. Which gas is used in filling electric bulbs____.
A. Neon
B. Argon
C. Radon
D. Krypton
Ans: B
Argon is used to fill incandescent light bulbs to inhibit the evaporation of the tungsten filaments and increase bulb life.
CHM 35. Lead pencil contains_____.
A. Lead nitrate
B. Graphite
C. Lead peroxide
D. Lead Sulphate
Ans: B
Most pencil cores are made of graphite mixed with a clay binder which leaves grey or black marks that can be easily erased.
CHM 36. Air is____?
A. Compound
B. Element
C. Mixture
D. Solution
Ans: C
Pure air is a mixture of several gases that are invisible and clourless. It consists of about 78% nitrogen, 21% oxygen, and less than 1% of argon, carbon dioxide and other gases, as well as varying amounts of water vapour.
CHM 37. Which of the following is a noble gas______?
A. Argon
B. Hydrogen
C. Oxygen
D. Nitrogen
Ans: A
Noble gas ,any of the seven chemical elements that make up Group 18 (VIIIa) of the periodictable. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn).
CHM 38. Study of old age is called_________?
A. Gerantalogy
B. Pedology
C. Ornithology
D. Anthropology
Ans: A
Gerontology is the study of the aging process itself. Geriatrics is sometimes called medical gerontology.
CHM 39. The chemical name for common salt______.
A. Sodium chloride
B. Sodium hydroxide
C. Sodium chlorate
D. Potasium chloride
Ans: A
Sodium chloride is also known common salt is an ionic compound with the chemical formula NaCl, representing a 1:1 ratio of sodium and chloride ions.
CHM 40. Liquid metal is______?
A. Mercury
B. Sodium
C. Antimony
D. None
Ans: A
Liquid metal consists of gallium-containing alloys with very low melting points which are liquid at room temperature. The standard metal formerly is mercury.
CHM 41. Match sticks are made of____?
A. Red phosphorus
B. blue phosphorus
C. led nitrate
D. None
Ans: A
Red phosphorus is used in matches. Ferrophosphorus, a combination of phosphorus with iron, is used as an ingredient in high-strength low-alloy steel.
CHM 42. Chemical that is used in photography______?
A. Copper sulphate
B. Silver bromide
C. Magnesium sulphate
D. None
Ans: B
Silver bromide (AgBr) is a soft pale-yellow, water-insoluble salt well for its unusual sensitivity to light. This property has allowed silver halides to become the basis of modern photographic materials. AgBr is widely used in photographic films and is believed by some to have been used for making the Shroud of Turin.
CHM 43. ‘Plaster of pans’ chemically known as______.
A. Sodium Aluminate
B. Calcium sulphate
C. Spdium bicarbonate
D. Sodium acetate
Ans: B
Calcium sulphate is a calcium salt that is used for a variety of purposes. It exists in various forms and states of hydration. Plaster of Paris is a mixture of powdered and heat-treated gypsum.
CHM 44. When iron rusts, its weight________?
A. decreases
B. increases
C. Constant
D. None
Ans: B
Iron rust when they come into contact with water and oxygen. They rust faster in salty water or acid rain.
CHM 45. Which is not a type of elements?
A. Metals
B. Non Metals
C. Metalloids
D. Gases
Ans: C
Element is a chemical substance consisting of atoms having the same number of protons in their atomic nuclei.
There are 118 elements that have been identified. The elements classified as metalloids are boron, silicon, germanium, arsenic, antimony, tellurium and polonium.
CHM 46. Which acid is present in lemon?
A. marlic acid
B. citric acid
C. lactic acid
D. tartaric acid
Ans: B
Citric acid is a weak organic acid with the formula C6H8O7.The juice of the lemon is about 5% to 6% citric acid, which gives a sour taste.
CHM 47. What among following is used to produce artificial rain?
A. copper oxide
B. carbon monoxide
C. silver iodide
D. silver nitrate
Ans: C
Artificial rain is produced by spraying clouds with substances like Silver Iodide (costly) or cheaper ones like solid carbon dioxide (dry ice) or even finely powdered Sodium Chloride.
CHM 48. Which is used in preparation of dynamite?
A. glycerol
B. ethyl alcohol
C. methyl alcohol
D. glycol
Ans: A
Dynamite is an explosive material based on nitroglycerin, using diatomaceous earth or another adsorbent substance such as powdered shells or clay
CHM 49. Nail polish remover contains?
A. benzene
B. acetic acid
C. acetone
D. petroleum ether
Ans: C
The most common solvents are acetone. It is powerful and effective but can be harsh on skin and nails. Acetonitrile has been used as a nail polish remover.
CHM 50. Human bone does not contain________.
A. calcium
B. carbon
C. oxygen
D. phosphorous
Ans: C
Human Bones are primarily formed from salts of calcium, carbon and phosphate, the major salt being hydroxyapatite.
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