MCQs

chemistry Questions with solutions MCQs

1. Which of the following substances is used in cold countries to melt ice accumulated on the roads during winter?

A

salt

B

urea

C

sand

D

oil

chemistry General Science
Correct Answer : A
Explanation :

Salt lowers the freezing point of ice below zero degree.

Correct Answered :

Wrong Answered :

2. Which of the following options is used as disinfectant to disinfect the Personal Protective Equipments (PPE) used by sanitation workers?

A

Sodium Hypochlorite

B

Calcium Carbonate

C

Sodium Benzoate

D

Sodium Bicarbonate

Chemistry General Science
Correct Answer : A
Explanation :

Sodium hypochlorite, commonly known as bleach, is most frequently used as a disinfecting agent. It is a broad-spectrum disinfectant that is effective for the disinfection of viruses, bacteria, fungi, and mycobacterium.

Correct Answered :

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3. Identify the metals which can be extracted by cyanide process

A

Silver

B

Mercury

C

Copper

D

Zinc

Chemistry General Science
Correct Answer : A
Explanation :

Cyanide process, also called Macarthur-forrest Process, method of extracting silver and gold from their ores by dissolving them in a dilute solution of sodium cyanide or potassium cyanide.

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4. Which of the following is NOT a noble gas?

A

Helium

B

Nitrogen

C

Argon

D

Neon

Chemistry General Science
Correct Answer : B
Explanation :

Noble gas means any of the gaseous elements which occupy Group 0(18) of the periodic table. They exhibit great stability and very low reaction rate. Complete step by step solution: Noble gases are generally inert gas that exhibit great stability and have generally full filled electronic configuration. They belong to group 18 of the periodic table. Group 18 of the periodic table includes He, Ne, Ar, Kr, Xe and Rn.

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5. The most common material used in making solar cells is

A

Silver

B

Iron

C

Aluminum

D

Silicon

Chemistry General Science
Correct Answer : D
Explanation :

Silicon is, by far, the most common semiconductor material used in solar cells, representing approximately 95% of the modules sold today. It is also the second most abundant material on Earth (after oxygen) and the most common semiconductor used in computer chips.

Correct Answered :

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6. The mass of one Hydrogen atom is approximately

A

One atomic mass unit

B

Two atomic mass unit

C

Twelve atomic mass unit

D

sixteen atomic mass unit

Chemistry General Awareness
Correct Answer : A
Explanation :

The mass of 1 hydrogen atom is estimated to be equal to the mass of a proton, which is equal to 1 AMU (Atomic Mass Unit)

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7. Most of the mass of an atom is concentrated in the

A

Protons

B

Electrons

C

Neutrons

D

Nucleus

Chemistry General Awareness
Correct Answer : D
Explanation :

The mass of the atom is concentrated in the nucleus (protons and neutrons are about 2000 times as heavy as electrons)

Correct Answered :

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8. Esters are formed by reaction of

A

Alcohol and acid

B

acid and base

C

ketone and alcohol

D

alcohol and aldehyde

Chemistry General Science
Correct Answer : A
Explanation :

Esters are formed by the condensation reaction between an alcohol and a carboxylic acid. This is known as esterification.

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9. Anhydroud calcium chloride is a

A

drying agent

B

hydrating agent

C

carboxylating agent

D

decarboxylating agent

Chemistry General Science
Correct Answer : A
Explanation :

The anhydrous calcium chloride will absorb any water (including condensation, vapour etc) in its environment. It effectively traps that water by changing its molecular make-up.

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10. Vinegar contains

A

Acetic Acid

B

Hydrochloric acid

C

Citric acid

D

Phosphoric acid

Chemistry General Science
Correct Answer : A
Explanation :

Vinegar is an aqueous solution of acetic acid and trace compounds that may include flavorings. Vinegar typically contains 5–8% acetic acid by volume.

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11. Which among the following is poor conductor of heat?

A

Gold

B

Silver

C

Copper

D

Glass

Chemistry General Science
Correct Answer : D
Explanation :

Relative to metals, glass is a poor conductor of heat. It is a better heat conductor than some other common building materials, such as wood.

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12. When rose petal is dipped in a jar of sulphur dioxide

A

the petal gets discolourised

B

the colour of petal increases

C

there is no change in petal colour

D

the petal becomes a liquid

Chemistry General Science
Correct Answer : A
Explanation :

Sulphur dioxide is a good reducing agent, hence it can easily decolourise substances in the presence of water. Therefore, when rose petals are placed in a jar containing sulphur dioxide, they get decolourised.

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13. The element which exhibits catenation property is

A

Sodium

B

Magnesium

C

Carbon

D

Nitrogen

Chemistry General Science
Correct Answer : C
Explanation :

Carbon exhibits the property of catenation due to strong C-C bond.

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14. Ethanoic acid is also called as

A

Acetic Acid

B

Ethanol

C

Methanol

D

Glycol

Chemistry General Science
Correct Answer : A
Explanation :

Image result for Ethanoic acid is also called as Acetic acid (CH3COOH), also called ethanoic acid, the most important of the carboxylic acids.

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15. pH of the human blood lies in the range of

A

7.35 to 7.45

B

7.52 to 7.72

C

6.21 to 6.61

D

7.00 to 7.21

Chemistry General Science
Correct Answer : A
Explanation :

Blood is normally slightly basic, with a normal pH range of about 7.35 to 7.45. Usually the body maintains the pH of blood close to 7.40. A doctor evaluates a person`s acid-base balance by measuring the pH and levels of carbon dioxide (an acid) and bicarbonate (a base) in the blood.

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16. When magnesium ribbon is burnt in presence of air, it forms

A

White flame

B

red flame

C

green flame

D

blue flame

Chemistry General Science
Correct Answer : A
Explanation :

When magnesium ribbon is burnt in the air, it combines with oxygen to form white powder magnesium oxide MgO with the release of heat and light. It forms a white powder of magnesium oxide. Magnesium gives up two electrons to oxygen atoms to form this powdery product.

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17. Sodium is obtained/isolated from its metal chloride ore by the process of

A

Electrolysis

B

Hydrolysis

C

Carboxylation

D

Decarboxylation

Chemistry General Science
Correct Answer : A
Explanation :

Sodium is extracted from it`s ore by electrolysis of fused sodium chloride. The process is usually carried out ia a special electrochemical cell called the downs cell.

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18. Aspirin is prepared by using

A

Salicylic acid

B

Sulphuric Acid

C

Hydrochloric Acid

D

Acetic Acid

Chemistry General Science
Correct Answer : A
Explanation :

Aspirin is prepared by chemical synthesis from salicylic acid, through acetylation with acetic anhydride. The molecular weight of aspirin is 180.16g/mol. It is odourless, colourless to white crystals or crystalline powder.

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19. Tooth decay starts when pH of mouth

A

drops below 5

B

rises above 6

C

rises above 8

D

rises above 10

Chemistry General Science
Correct Answer : A
Explanation :

Tooth decay starts when the pH of the mouth is lower than 5.5. Using toothpastes, which are generally basic, for cleaning the teeth can neutralise the excess acid and prevent tooth decay.

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20. Unsaturated carbon compound when burnt gives

A

blue flame

B

green flame

C

yellow flame

D

no flame

Chemistry General Science
Correct Answer : C
Explanation :

Unsaturated carbon compounds on combustion give a yellow flame with lots of black soot. On combustion, saturated carbon compounds give a clean flame while unsaturated carbon compounds give a yellow flame with lots of black soot.

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21. Liberation of heat during chemical reaction is termed as

A

Exothermic reactions

B

Endothermic reactions

C

Isothermic reactions

D

Photochemical reactions

Chemistry General Science
Correct Answer : A
Explanation :

A chemical reaction in which heat or energy is liberated is called an exothermic reaction.

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22. In a homologous series, increase in melting point can be seen with increase in

A

Molecular mass

B

Atomic number

C

Proton

D

Electron

Chemistry General Science
Correct Answer : A
Explanation :

The number of C atoms in homologous series increases gradually. Van der Waal`s force increases as the molecules get bigger. Hence, the melting and boiling points of the members of homologous series increase gradually because their molecular masses increase.

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23. Antacid used for reducing stomach pain is a

A

mild base

B

mild acid

C

neutral solution

D

strong acid

Chemistry General Science
Correct Answer : A
Explanation :

To get rid of stomach pain, people use bases called antacids. These antacids neutralise the excess acid. Magnesium hydroxide (Milk of magnesia), a mild base, is often used for this purpose.

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24. Most reactive metal among the following is

A

Sodium

B

Magnesium

C

Gold

D

Silver

Chemistry General Science
Correct Answer : A
Explanation :

After Potassium, Sodium is the most reactive metal.

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25. When Sodium reacts with water to form sodium hydroxide, the physical state of sodium hydroxide is

A

Solid

B

Liquid

C

Gas

D

Plasma

Chemistry General Science
Correct Answer : B
Explanation :

Sodium metal reacts rapidly with water to form a colourless solution of sodium hydroxide (NaOH) and hydrogen gas (H2). The resulting solution is basic because of the dissolved hydroxide. The reaction is exothermic.

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26. When carbon dioxide is passed through lime water, the white precipitate obtained is

A

Calcium Carbonate

B

Sodium Carbonate

C

Potassium Carbonate

D

Zinc Carbonate

Chemistry General Science
Correct Answer : A
Explanation :

When carbon dioxide is passed through lime water, it turns milky due to formation of white precipitate in form of calcium carbonate.

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27. An example of saturated carbon compound is

A

Ethane

B

Ethene

C

Propene

D

Alkene

Chemistry General Science
Correct Answer : A
Explanation :

Example of saturated carbon compound is Ethane (C2H6).

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28. Rancidity in oils and fats is due to

A

Oxidation

B

Reduction

C

Substitution reaction

D

Combination reaction

Chemistry General Science
Correct Answer : A
Explanation :

Oxygen is eight times more soluble in fats than in water and it is the oxidation resulting from this exposure that is the primary cause of rancidity. Oxidation primarily occurs with unsaturated fats by a free radical-mediated process.

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29. Functional group in butanal is

A

CHO

B

COOH

C

COOR

D

CO

Chemistry General Science
Correct Answer : A
Explanation :

In Butanal, the functional group is −CHO. In Butanol, the functional group is −OH.

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30. Components of the Stainless steel alloy are

A

Iron, Nickel and Chromium

B

Iron, Nickel and Magnesium

C

Iron, Bronze and Magnesium

D

Bronze, Magnesium and Nickel

Chemistry General Science
Correct Answer : A
Explanation :

Stainless steel alloys contain carbon, chromium, nickel, molybdenum, and manganese, phosphorus, sulfur, and silicon as trace elements.

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31. Addition of Sodium chloride to water

A

increases temperature of water

B

decreases temperature of water

C

no change in temperature

D

rapidly increases temperature and then decreases

Chemistry General Science
Correct Answer : B
Explanation :

If you add salt to water, you raise the water`s boiling point, or the temperature at which it will boil. The temperature needed to boil will increase about 0.5 C for every 58 grams of dissolved salt per kilogram of water.

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32. Methyl orange indicator give which of the following colour in an acid solution

A

Red

B

Yellow

C

Orange

D

Pink

Chemistry General Science
Correct Answer : A
Explanation :

Methyl orange indicator gives red color in acid solution.

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33. Which of the following law states, matter can neither created nor destroyed during a chemical reaction?

A

Constant proportion

B

Conservation of mass

C

Disproportion

D

Invisible particles

Chemistry General Science
Correct Answer : B
Explanation :

The Law of Conservation of Mass dates from Antoine Lavoisier`s 1789 discovery that mass is neither created nor destroyed in chemical reactions. In other words, the mass of any one element at the beginning of a reaction will equal the mass of that element at the end of the reaction.

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34. Which one among the following statements about thermal conductivity is correct?

A

Steel > Wood > Water

B

Steel > Water>Wood

C

Water > Wood >Steel

D

Water > Steel > Wood

Chemistry General Science
Correct Answer : B
Explanation :

Thermal conductivity is defined as the heat flow per unit time. Steel has a higher thermal conductivity than water and wood. [Thermal conductivity of steel = 50.2 w/mk Thermal conductivity of water = 0.6 w/mk Thermal conductivity of wood = 0.12 w/mk]

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35. The solid or liquid particles suspended in the air are called

A

Acid

B

Hydrocarbons

C

Aerosols

D

Water

Chemistry Laboratory Attendant 2021
Correct Answer : C
Explanation :

C

Correct Answered :

Wrong Answered :

36. Uptake of Nitrogen in the Neem tree is in the form of

A

Organic compounds prepared by bacteria from atmospheric nitrogen.

B

Nitrous oxide through gaseous exchange from stomata of the plant

C

Nitric oxide through gaseous exchange from stomata of the plant

D

Nitrous oxide through roots of the plant

Chemistry Laboratory Attendant 2021
Correct Answer : A
Explanation :

A

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Wrong Answered :

37. Which of the following vitamins is also known as Ascorbic Acid?

A

Vitamin C

B

Vitamin B1

C

Vitamin B2

D

Vitamin B6

Chemistry Sub Auditor 2021
Correct Answer : A
Explanation :

Vitamin C

Correct Answered :

Wrong Answered :

38. Which type of energy source is tidal energy?

A

Non-Renewable

B

Conventional

C

Exhaustible

D

Non-Conventional

Chemistry Sub Auditor 2021
Correct Answer : D
Explanation :

Non-Conventional

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39. What is the chemical symbol of Iron?

A

In

B

Cu

C

Ir

D

Fe

Chemistry Sub Auditor 2021
Correct Answer : D
Explanation :

Fe

Correct Answered :

Wrong Answered :

40. Which of the following states of matter has the strongest intermolecular forces?

A

Plasma

B

Gas

C

Liquid

D

Solid

Chemistry Sub Auditor 2021
Correct Answer : D
Explanation :

Solid

Correct Answered :

Wrong Answered :

41. In which layer of the earth`s atmosphere do precipitation occur?

A

Mesosphere

B

Exosphere

C

Stratosphere

D

Troposphere

Chemistry Sub Auditor 2021
Correct Answer : D
Explanation :

Troposphere

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Wrong Answered :

42. Which of the following is known as black gold?

A

Petroleum

B

Coal

C

Wood

D

Biofuel

Chemistry Sub Auditor 2021
Correct Answer : A
Explanation :

The Petroleum is called black gold because when the crude oil is extracted from the soil below, it is black in colour.

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43. On which quantum number does the orientation of atomic orbitals depend?

A

Principal Quantum Number

B

Azimuthal Quantum Number

C

Magnetic Quantum Number

D

Spin Quantum Number

Chemistry Sub Auditor 2021
Correct Answer : C
Explanation :

Magnetic Quantum Number

Correct Answered :

Wrong Answered :

44. In which continent is ozone hole found for the first time?

A

South America

B

Africa

C

Antarctica

D

North America

Chemistry Sub Auditor 2021
Correct Answer : C
Explanation :

Antarctica

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Wrong Answered :

45. The relationship between which two gas variables are shown in Charles law?

A

Pressure - Temperature

B

Temperature - Volume

C

Pressure - Volume

D

Volume - Number of Gas Particles

Chemistry Sub Auditor 2021
Correct Answer : B
Explanation :

Temperature - Volume

Correct Answered :

Wrong Answered :

46. Mole is the SI unit of ____

A

Luminous Intensity

B

Electric Current

C

Thermodynamic Temperature

D

Amount of Substance

Chemistry Sub Auditor 2021
Correct Answer : D
Explanation :

Amount of Substance

Correct Answered :

Wrong Answered :

47. Which of the following is an example of ferrous mineral?

A

Graphite

B

Manganese

C

Gold

D

Mica

Chemistry Sub Auditor 2021
Correct Answer : B
Explanation :

Manganese

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Wrong Answered :

48. In which of the following medium sound travels faster?

A

Solid

B

Fluid

C

Gas

D

Liquid

Chemistry Sub Auditor 2021
Correct Answer : A
Explanation :

Solid

Correct Answered :

Wrong Answered :

49. What is the second layer of the earth`s atmosphere?

A

Exosphere

B

Mesosphere

C

Troposphere

D

Stratosphere

Chemistry Sub Auditor 2021
Correct Answer : D
Explanation :

Stratosphere

Correct Answered :

Wrong Answered :

50. What is the chemical symbol of Silver?

A

Au

B

K

C

Ag

D

Pb

Chemistry Sub Auditor 2021
Correct Answer : C
Explanation :

Ag

Correct Answered :

Wrong Answered :

51. What is the scientific name of Vitamin B9?

A

Pyridoxine

B

Ascorbic Acid

C

Riboflavin

D

Folic Acid

Chemistry Sub Auditor 2021
Correct Answer : D
Explanation :

Folic Acid

Correct Answered :

Wrong Answered :

52. Which of the following type of solids are anisotropic in nature?

A

Amorphous Solid

B

Pseudo Solid

C

Super Cooled Liquid

D

Crystalline Solid

Chemistry Sub Auditor 2021
Correct Answer : D
Explanation :

Crystalline Solid

Correct Answered :

Wrong Answered :

53. What is the atomicity of nitrogen?

A

3

B

8

C

1

D

2

Chemistry Sub Auditor 2021
Correct Answer : D
Explanation :

2

Correct Answered :

Wrong Answered :

54. Which of the following states of matter has indefinite shape and indefinite volume?

A

Solid

B

Gas

C

Liquid

D

Plasma

Chemistry Sub Auditor 2021
Correct Answer : B
Explanation :

Gas

Correct Answered :

Wrong Answered :

55. Which of the following is an example of secondary electrical battery?

A

Leclanche cell

B

Nickel - Cadmium Battery

C

Dry Cell

D

Lithium Cell

Chemistry Sub Auditor 2021
Correct Answer : B
Explanation :

Nickel - Cadmium Battery

Correct Answered :

Wrong Answered :

56. Which of the following gas laws shows the relationship of volume and number of gas particles?

A

Avogadro Law

B

Gay Lussac`s Law

C

Charles Law

D

Boyle`s Law

Chemistry Sub Auditor 2021
Correct Answer : A
Explanation :

Avogadro Law

Correct Answered :

Wrong Answered :

57. What is the chemical symbol of Sodium?

A

Au

B

Na

C

Pb

D

Ag

Chemistry Sub Auditor 2021
Correct Answer : B
Explanation :

Na

Correct Answered :

Wrong Answered :

58. What is the atomicity of Helium?

A

2

B

1

C

8

D

3

Chemistry Sub Auditor 2021
Correct Answer : B
Explanation :

Helium is a noble monoatomic gas and does not combine with other elements so it is a monoatomic gas and the atomicity is one

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Wrong Answered :

59. Which of the following is an example of mineral fuel?

A

Bauxite

B

Manganese

C

Mica

D

Coal

Chemistry Sub Auditor 2021
Correct Answer : D
Explanation :

Coal

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Wrong Answered :

60. Which of the following when added to pure water usually increases its surface tension?

A

Detergent

B

Sodium Chloride

C

Kerosene oil

D

Phenyl

Chemistry JKP SI 2022
Correct Answer : B
Explanation :

The surface tension of water is increased when salt is added to it. Although the strong interactions between sodium cations and partial negative oxygen, and chloride anions and partial positive hydrogens disrupt some hydrogen bonding between water molecules, they actually strengthen the surface tension of water.

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61. Which of the following substances is usually used in cold countries to melt ice accumulated on the roads during winter?

A

Salt

B

Urea

C

Boric Acid

D

Hydrogen Peroxide

Chemistry JKP SI 2022
Correct Answer : A
Explanation :

Rock salt or halite is the form of sodium chloride. Brine is a solution of water and salt has a lower freezing point than pure water putting salt or saltwater on ice that is near 0oC will cause it to melt. It is called as de-icing done after snowstorm to improve traction.

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62. Which of the following options is an example for chemical change?

A

Crystallization of salt

B

Evaporation

C

Burning of coal

D

Melting of ice

Chemistry JKP SI 2022
Correct Answer : C
Explanation :

Burning of coal is a chemical change. When coal is burnt, the chief component, carbon is changed to carbon dioxide. This process cannot be reversed.

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Wrong Answered :

63. What is the full form of MSG, a chief flavor enhancer used in the food industry?

A

Monosodium glycinate

B

Monosodium glutamate

C

Monosodium glutamine

D

Monosulphur glycerol

Chemistry JKP SI 2022
Correct Answer : B
Explanation :

Monosodium glutamate (MSG) is a flavor enhancer commonly added to Chinese food, canned vegetables, soups and processed meats.

Correct Answered :

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64. CNG is a fuel gas which is mainly composed of methane that is used for vehicles in general. Here CNG stands for

A

Complex nitrous gas

B

certified national gas

C

compressed natural gas

D

coal and nucleotide gas

Chemistry JKP SI 2022
Correct Answer : C
Explanation :

compressed natural gas

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Wrong Answered :

65. Among the following, what is Cupric sulfate commercially known as?

A

Baking Soda

B

Blue Vitriol

C

Bleaching Powder

D

Gypsum

Chemistry JKPSI 2022 CBT
Correct Answer : B
Explanation :

Cupric sulfate, CuSO4, commonly known as blue vitriol, is the most important salt of copper.

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66. Which of the following is a superconductor?

A

Ceramic

B

Air

C

Paper

D

Mercury

Chemistry JKPSI 2022 CBT
Correct Answer : D
Explanation :

Superconductor material classes include chemical elements like mercury or lead, alloys such as niobium-titanium, germanium-niobium, and niobium nitride, or organic superconductors.

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67. Which among the following process is associated with application of zinc coating to steel or iron to prevent rusting?

A

Galvanisation

B

Halogenation

C

Polycondensation

D

None of these

Chemistry JKPSI 2022 CBT
Correct Answer : A
Explanation :

Galvanizing is the process of applying zinc coating to a more noble metal (popularly steel or iron) to prevent corrosion (rusting). Hot-dip galvanization is the most well-known method in which the steel part is submerged in a bath of molten zinc.

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68. Which among the following is the chemical name of Plaster of Paris?

A

Sodium chloride

B

Calcium chloride

C

Calcium sulfate hemihydrate

D

None of these

Chemistry JKPSI 2022 CBT
Correct Answer : C
Explanation :

Plaster of Paris is a fine white powder of calcium sulphate hemihydrate. The chemical formula of Plaster of Paris is CaSO4. 1/2H2O.

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69. Which of the following is an essential trace element involved in the correct packing and storage of insulin?

A

Sodium

B

Nickel

C

Zinc

D

Phosphorus

Chemistry JKPSI 2022 CBT
Correct Answer : C
Explanation :

Zinc is an essential trace element involved in the correct packing and storage of insulin. Total zinc content in the pancreatic β-cells is among the highest in the body and changes in the Zn(2+) levels have been found to be associated with diabetes.

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Wrong Answered :

70. Which one of the following is a component of tear gas?

A

Methane

B

Methanol

C

Ether

D

Chloropicrin

Chemistry JKPSI 2022 CBT
Correct Answer : D
Explanation :

Chloropicrin is a constituent of tear gas and is responsible for causing irritation.

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Wrong Answered :

71. Which of the following is true
1. Water with high salinity is denser than water with low salinity
2. Cold water is denser than warm water

A

Only 1

B

Only 2

C

Both 1 and 2

D

None of these

Chemistry JKPSI 2022 CBT VERIFIED
Correct Answer : C
Explanation :

Both 1 and 2

Correct Answered :

Wrong Answered :

72. Which among the following is a clear, colourless, viscous, sweet-tasting liquid belonging to the alcohol of organic compounds?

A

Ethyl alcohol

B

Sodium Chloride

C

Glycerol

D

Oxalic Acid

Chemistry JKPSI 2022 CBT
Correct Answer : C
Explanation :

glycerol, a clear, colourless, viscous, sweet-tasting liquid belonging to the alcohol family of organic compounds; molecular formula HOCH2CHOHCH2OH.

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Wrong Answered :

73. Which of the following is the most commonly used disinfectant in water purification?

A

Chlorine

B

Ozone

C

Mercury

D

Nitrogen

Chemistry JKPSI 2022 CBT
Correct Answer : A
Explanation :

Chlorine and chloramine are the major disinfectants used in public water systems.

Correct Answered :

Wrong Answered :

74. Which among the following are the principal constituents of petroleum and natural gas?

A

Allotropes

B

Hydrocarbons

C

Photolysis

D

Amorphous

Chemistry JKPSI 2022 CBT
Correct Answer : B
Explanation :

Hydrocarbons

Correct Answered :

Wrong Answered :

75. To increase the solubility of CO2 in soft drinks and soda water, the bottle is sealed under which of the following condition?

A

High pressure

B

Low pressure

C

Zero pressure

D

None of these

Chemistry JKPSI 2022 CBT
Correct Answer : A
Explanation :

To increase the solubility of CO2 in soft drinks and soda water, the bottles are sealed under high pressure. The solubility of a gas in a liquid is directly proportional to the pressure of the gas.

Correct Answered :

Wrong Answered :

76. Which among the following is combined with oxygen in the cells and produces CO2 and water during respiration?

A

Sucrose

B

Fructose

C

Glucose

D

Lactose

Chemistry JKPSI 2022 CBT
Correct Answer : C
Explanation :

Glucose

Correct Answered :

Wrong Answered :

77. Which of the following does hard water contain?

A

Iron

B

Calcium

C

Phosphorus

D

Potassium

Chemistry JKPSI 2022 CBT
Correct Answer : B
Explanation :

The simple definition of water hardness is the amount of dissolved calcium and magnesium in the water. Hard water is high in dissolved minerals, largely calcium and magnesium.

Correct Answered :

Wrong Answered :

78. The following question consists of two words that have a certain relationship to each other.

Choose the correct alternative that has the same relationship as the original pair has

Poles : Magnet :: ? : Battery


A

Tracks

B

Distance

C

Joule

D

Terminals

Chemistry JKPSI 2022 CBT
Correct Answer : D
Explanation :

Terminals

Correct Answered :

Wrong Answered :

79. If we put camphor in an open container, its amount keeps on decreasing due to the phenomenon of which among the following?

A

Evaporation

B

Precipitation

C

Sublimation

D

None of these

Chemistry JKPSI 2022 CBT
Correct Answer : C
Explanation :

Camphor converts directly into its gaseous state without converting into a liquid state. This phenomenon is called sublimation. Hence, when it`s kept in open its quantity keeps on decreasing as it converts to its gaseous state.

Correct Answered :

Wrong Answered :

80. In which city, India`s first indigenously developed Hydrogen Fuel Cell Bus has been inaugurated.

A

Banglore

B

Ahmedabad

C

Pune

D

Noida

Chemistry JKPSI 2022 CBT
Correct Answer : C
Explanation :

Pune

Correct Answered :

Wrong Answered :

81. Chloroform is slowly oxidised by air in the presence of light to form an extremely poisonous gas knows as ____

A

Freon

B

Carbon tetrachloride

C

Methylene chloride

D

Phosgene

Chemistry JKPSI 2022 CBT
Correct Answer : D
Explanation :

When Chloroform reacts with air and sunlight, it produces a toxic gas known as Phosgene gas along with Hydrochloric acid .

Correct Answered :

Wrong Answered :

82. Which of the following is the colorless and odorless air pollutant?

A

Sulphur Dioxide

B

Carbon Monoxide

C

Ozone

D

Nitrous Oxide

Chemistry JKPSI 2022 CBT
Correct Answer : B
Explanation :

Carbon monoxide (CO) is a colourless, odourless gas produced by the incomplete combustion of carbonaceous fuels such as wood, petrol, coal, natural gas and kerosene in simple stoves, open fires, wick lamps, furnaces, fireplaces.

Correct Answered :

Wrong Answered :

83. Black carbon is another name for

A

Soot

B

Smog

C

Smoke

D

Ozone

Chemistry JKPSI 2022 CBT
Correct Answer : A
Explanation :

The term black carbon is sometimes used as a synonym for both the elemental and graphitic component of soot.

Correct Answered :

Wrong Answered :

84. Different substances have different vapor pressures at a given temperature due to the strength of their ____

A

aerosol

B

intermolecular forces

C

allotrope

D

both aerosol and allotrope

Chemistry JKPSI 2022 CBT
Correct Answer : B
Explanation :

Different substances have different vapor pressures at a given temperature due to the strength of their intermolecular forces. For molecules to escape into the vapor phase, they must have enough kinetic energy to overcome the intermolecular forces of other molecules at the surface of the liquid.

Correct Answered :

Wrong Answered :

85. Naphthalene is a volatile solid and is best purified by which of the following?

A

Crystallisation

B

Distillation

C

Steam distillation

D

Sublimation

Chemistry JKPSI 2022 CBT
Correct Answer : D
Explanation :

Naphthalene, being a subliming solid, is purified by sublimation.

Correct Answered :

Wrong Answered :

86. The infertile Saline soils contain largely proportion of which of the following?

A

Zinc, Sodium and Magnesium

B

Copper, Sodium and Potassium

C

Sodium, Potassium and Magnesium

D

Bronze, Magnesium and Sulphur

Chemistry JKPSI 2022 CBT
Correct Answer : C
Explanation :

Saline soils contain a larger proportion of sodium, potassium, and magnesium, and thus, they are infertile and do not support any vegetative growth. They have more salts, largely because of the dry climate and poor drainage.

Correct Answered :

Wrong Answered :

87. Most toxic metal pollutant of automobile exhaust is which of the following?

A

Cadmium

B

Lead

C

Copper

D

None of these

Chemistry JKPSI 2022 CBT
Correct Answer : B
Explanation :

Lead

Correct Answered :

Wrong Answered :

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