CBSE Class 10 Chemistry MCQs All Chapters Set 02

Science Objective Questions and Answers: All Chapters

Access targeted multiple-choice questions for All Chapters designed to align with the latest CBSE academic syllabus for Class 10 Science. These objective practice sets help students evaluate their conceptual understanding and improve exam readiness.

Download All Chapters MCQs with Answers

Access the complete set of multiple-choice questions for All Chapters below. This focused format allows students to isolate specific topics for thorough review and uninterrupted practice alongside official CBSE textbooks.

Multiple Choice Questions

Question 1: Which among the following types of coal produces most heat per unit ?
(a) Coal
(b) Lignite
(c) Anthracite
(d) Pit
Show Answer & Explanation

Answer: (c) Anthracite

Explanation:
1. Anthracite is the highest grade coal and gives the most heat per unit.

Question 2: A.T.F. is related to
(a) Civil aviation
(b) Railways
(c) Road transport
(d) None of these
Show Answer & Explanation

Answer: (a) Civil aviation

Explanation:
1. ATF is aviation turbine fuel, used in jet aircraft.

Question 3: Which zone of a candle flame is the hottest?
(a) Dark innermost zone
(b) Outermost zone
(c) Middle luminous zone
(d) Central zone
Show Answer & Explanation

Answer: (b) Outermost zone

Explanation:
1. The outer, non-luminous zone has complete combustion and is the hottest.

Question 4: Which of the following is a variety of coal?
(a) Anthracite
(b) Graphite
(c) Diamond
(d) Peat moss
Show Answer & Explanation

Answer: (a) Anthracite

Explanation:
1. Anthracite, bituminous, lignite and peat are coal varieties.

Question 5: The gas that usually causes explosions in coal mines is
(a) Hydrogen
(b) Carbon monoxide
(c) Air
(d) Methane
Show Answer & Explanation

Answer: (d) Methane

Explanation:
1. Methane is the gas that usually causes explosions in coal mines.

Question 6: The main constituent of LPG is
(a) Propane and butane
(b) Methane
(c) Ethane
(d) Hexane
Show Answer & Explanation

Answer: (a) Propane and butane

Explanation:
1. It is a liquefied petroleum gas.

Question 7: Coal is mainly made up of
(a) Carbon
(b) Hydrogen
(c) Nitrogen
(d) Sulphur
Show Answer & Explanation

Answer: (a) Carbon

Explanation:
1. It forms from buried plant matter.

Question 8: The chief source of naphthalene is
(a) Coal-tar
(b) Diesel
(c) Charcoal
(d) Camphor
Show Answer & Explanation

Answer: (a) Coal-tar

Explanation:
1. Coal tar is the chief source of naphthalene.

Question 9: Benzene cannot undergo :
(a) Substitution
(b) Addition
(c) Elimination
(d) Oxidation
Show Answer & Explanation

Answer: (c) Elimination

Explanation:
1. Benzene does not undergo elimination reactions.

Question 10: Heavy water is called heavy because
(a) It is denser than ordinary water
(b) It contains dissolved heavy metals
(c) It has a heavy (or bad) taste
(d) It has a heavier isotope of hydrogen
Show Answer & Explanation

Answer: (d) It has a heavier isotope of hydrogen

Explanation:
1. Heavy water (D₂O) contains deuterium, the heavier isotope of hydrogen, instead of ordinary hydrogen.

Question 11: What is the name of the Hydrogen that is produced from carbon-free nuclear power?
(a) Green Hydrogen
(b) White Hydrogen
(c) Pink Hydrogen
(d) Orange Hydrogen
Show Answer & Explanation

Answer: (c) Pink Hydrogen

Explanation:
1. The Carbon-free hydrogen produced from carbon-free nuclear power is referred to as Pink Hydrogen.

Question 12: Water consists of hydrogen and oxygen in the ratio of how much by volume?
(a) 2:1
(b) 1:2
(c) 1:8
(d) 8:1
Show Answer & Explanation

Answer: (a) 2:1

Explanation:
1. H2O has 2 volumes of H to 1 of O.

Question 13: Water consists of hydrogen and oxygen in the ratio of how much by mass?
(a) 1:8
(b) 2:1
(c) 1:2
(d) 8:1
Show Answer & Explanation

Answer: (a) 1:8

Explanation:
1. 2 g of H to 16 g of O gives 1:8.

Question 14: Heavy water is chemically
(a) deuterium oxide (D2O)
(b) hydrogen peroxide
(c) tritium oxide
(d) ordinary water with salts
Show Answer & Explanation

Answer: (a) deuterium oxide (D2O)

Explanation:
1. Heavy water contains deuterium.

Question 15: Hard water contains dissolved bicarbonates, chlorides and sulphates of
(a) calcium and magnesium
(b) sodium and potassium
(c) iron and zinc
(d) copper and lead
Show Answer & Explanation

Answer: (a) calcium and magnesium

Explanation:
1. Calcium and magnesium salts cause hardness.

Question 16: Heavy water is used as a
(a) Moderator in nuclear reactors
(b) Fuel
(c) Coolant for engines
(d) Fertiliser
Show Answer & Explanation

Answer: (a) Moderator in nuclear reactors

Explanation:
1. It slows down neutrons.

Question 17: Electroplating is the process of
(a) plating one metal on another by electrolysis
(b) melting metals
(c) rusting metals
(d) alloying metals
Show Answer & Explanation

Answer: (a) plating one metal on another by electrolysis

Explanation:
1. It is used for decoration and to prevent corrosion.

Question 18: The metal extracted from Bauxite is :
(a) Silver
(b) Copper 30.
(c) Manganese
(d) Aluminum
Show Answer & Explanation

Answer: (d) Aluminum

Explanation:
1. Aluminium is extracted from bauxite.

Question 19: Which of the following metals has least melting point ?
(a) Gold
(b) Silver
(c) Mercury
(d) Copper
Show Answer & Explanation

Answer: (c) Mercury

Explanation:
1. Mercury has the lowest melting point among the metals listed (it is liquid at room temperature).

Question 20: The purest form of Iron is :
(a) Cast iron
(b) Steel
(c) Pig iron
(d) Wrought iron
Show Answer & Explanation

Answer: (d) Wrought iron

Explanation:
1. Wrought iron is the purest form of iron.

Question 21: Which one of the following mineral does not contain oxygen ?
(a) Haematite
(b) Bauxite
(c) Cryolite
(d) Calcite Ans: (¢) Which one of the following is used to restore the colour of old oilpaintings ? (a) Ozone (b) Hydrogen peroxide (c) Barium peroxide (d) Sodium peroxide
Show Answer & Explanation

Answer: (c) Cryolite

Explanation:
1. Cryolite (Na3AlF6) is the mineral that contains no oxygen.

Question 22: Except mercury and gallium, metals are
(a) Solid at room temperature
(b) Liquid
(c) Gaseous
(d) Non-conductors
Show Answer & Explanation

Answer: (a) Solid at room temperature

Explanation:
1. Gallium melts at about 30 degrees C.

Question 23: The only metal that is liquid at room temperature is
(a) Mercury
(b) Gallium
(c) Sodium
(d) Lead
Show Answer & Explanation

Answer: (a) Mercury

Explanation:
1. Gallium melts just above room temperature.

Question 24: Non-metals are generally
(a) Bad conductors of heat and electricity
(b) Good conductors
(c) Lustrous
(d) Malleable
Show Answer & Explanation

Answer: (a) Bad conductors of heat and electricity

Explanation:
1. They tend to gain electrons.

Question 25: Laughing gas is
(a) Nitrous oxide
(b) Nitric oxide
(c) Nitrogen dioxide
(d) Ammonia
Show Answer & Explanation

Answer: (a) Nitrous oxide

Explanation:
1. Its formula is N2O.

Question 26: Common salt is
(a) Sodium chloride
(b) Sodium carbonate
(c) Sodium sulphate
(d) Potassium chloride
Show Answer & Explanation

Answer: (a) Sodium chloride

Explanation:
1. Its formula is NaCl.

Question 27: Blue vitriol is
(a) Copper sulphate
(b) Zinc sulphate
(c) Iron sulphate
(d) Sodium sulphate
Show Answer & Explanation

Answer: (a) Copper sulphate

Explanation:
1. Its formula is CuSO4.5H2O.

Question 28: White vitriol is
(a) Zinc sulphate
(b) Copper sulphate
(c) Iron sulphate
(d) Sodium sulphate
Show Answer & Explanation

Answer: (a) Zinc sulphate

Explanation:
1. Its formula is ZnSO4.7H2O.

Question 29: Gypsum is chemically
(a) Calcium sulphate dihydrate
(b) Calcium sulphate hemihydrate
(c) Calcium carbonate
(d) Calcium oxide
Show Answer & Explanation

Answer: (a) Calcium sulphate dihydrate

Explanation:
1. Plaster of Paris is the hemihydrate.

Question 30: Plaster of Paris is chemically
(a) Calcium sulphate hemihydrate
(b) Calcium sulphate dihydrate
(c) Calcium carbonate
(d) Calcium oxide
Show Answer & Explanation

Answer: (a) Calcium sulphate hemihydrate

Explanation:
1. Its formula is 2CaSO4.H2O.

Question 31: Washing soda is chemically
(a) Sodium carbonate
(b) Sodium bicarbonate
(c) Sodium hydroxide
(d) Sodium chloride
Show Answer & Explanation

Answer: (a) Sodium carbonate

Explanation:
1. Its formula is Na2CO3.10H2O.

Question 32: Which one of the following naturally occurring acids is found in abundance in tomato?
(a) Acetic acid
(b) Citric acid
(c) Oxalic acid
(d) Tartaric acid
Show Answer & Explanation

Answer: (c) Oxalic acid

Explanation:
1. Tomatoes are well known for containing oxalic acid.

Question 33: The tracking of people by trained dogs is based on the recognisation of which of the following compounds in the sweat from feet?
(a) Carboxylic acids
(b) Uric acid
(c) Sugar
(d) Salt
Show Answer & Explanation

Answer: (a) Carboxylic acids

Explanation:
1. Dogs track people by smelling the carboxylic (fatty) acids in their sweat.

Question 34: Match List I with List II and select the correct answer using the code given below the lists:
List I (Acid)List II (Source)
A. Lactic acid1. Tamarind
B. Tartaric acid2. Orange
C. Oxalic acid3. Tomato
D. Citric acid4. Sour curd

(a) A-2, B-3, C-1, D-4
(b) A-2, B-1, C-3, D-4
(c) A-4, B-3, C-1, D-2
(d) A-4, B-1, C-3, D-2
Show Answer & Explanation

Answer: (d) A-4, B-1, C-3, D-2

Explanation:
1. Lactic acid – sour curd, tartaric acid – tamarind, oxalic acid – tomato, citric acid – orange.

Question 35: Which acid is used in the rubber, textile, leather and electroplating industries?
(a) Ethanoic acid
(b) Methanoic acid
(c) Malonic acid
(d) Butyric acid
Show Answer & Explanation

Answer: (b) Methanoic acid

Explanation:
1. Methanoic (formic) acid is used to coagulate latex and in textile dyeing, leather tanning and electroplating.

Question 36: Itching due to insect bite is caused by
(a) formic acid
(b) acetic acid
(c) lactic acid
(d) maleic acid
Show Answer & Explanation

Answer: (a) formic acid

Explanation:
1. Insects such as ants inject formic acid, which causes itching and pain.

Question 37: Which of the following chemicals is known as vinegar?
(a) Oxalic acid
(b) Formic acid
(c) Acetic acid
(d) Tartaric acid
Show Answer & Explanation

Answer: (c) Acetic acid

Explanation:
1. Acetic Acid is known as vinegar. It is produced by the fermentation of ethanol by acetic acid bacteria.

Question 38: What is a Bakelite ?
(a) Solution
(b) Acid
(c) Base
(d) Polymer
Show Answer & Explanation

Answer: (d) Polymer

Explanation:
1. Bakelite is a polymer.

Question 39: Plastics are made up of very long molecules composed of chains of
(a) Carbon atoms
(b) Hydrogen atoms
(c) Oxygen atoms
(d) Nitrogen atoms
Show Answer & Explanation

Answer: (a) Carbon atoms

Explanation:
1. They are polymers.

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Multiple Choice Questions (MCQs) for Class 10 Science All Chapters

Class 10 Science All Chapters Objective Test Questions

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