CBSE Class 11 Chemistry Multiple Choice Questions(MCQs) with Answers

61 Which metal was first used by man?

[A] Brass

[B] Gold

[C] Aluminium

[D] Iron

Answer: Aluminium

62 Which among the following gases is used to manufacture chloroform?

[A] Radon

[B] Methane

[C] Propane

[D] Ether

Answer: Methane

63 Biogas mainly contains

[A] Methane

[B] Nitrogen

[C] Carbon dioxide

[D] Oxygen

Answer: Methane

64 Which of the following is the hardest element?

[A] Silicon

[B] Iron

[C] Diamond

[D] Copper

Answer: Diamond

65 The chemical name of bauxite is

[A] Hydrated aluminium oxide

[B] Aluminium sulphite

[C] Aluminium chloride

[D] Aluminium oxide

Answer: Hydrated aluminium oxide

66 Which of the following metals is in liquid state at normal room temperature?

[A] Sodium

[B] Gallium

[C] Radon

[D] Silicon

Answer: Gallium

67 What is the chemical name for marble?

[A] Titanium dioxide

[B] Calcium bicarbonate

[C] Potassium nitrate

[D] Calcium carbonate

Answer: Titanium dioxide

68 Which variety of glass is heat resistant?

[A] Pyrex glass

[B] Flint glass

[C] Hard glass

[D] Bottle glass

Answer: Pyrex glass

69 In vulcanisation, natural rubber is heated with

[A] Sulphur

[B] Phosphorus

[C] carbon

[D] Silicon

Answer: Sulphur

70 What are soaps?

[A] Sodium, salts of heavier fatty acids

[B] Mixture of glycerol and alcohols

[C] Esters of heavy fatty acids

[D] Salts of silicates

Answer: Sodium, salts of heavier fatty acids

71 Which one of the following is an element ?

[A] Diamond

[B] Sapphire

[C] Topaz

[D] Ruby

Answer: Diamond

72 Which one of the following is correct ? Butter is

[A] A super cooled oil

[B] an emulsion

[C] a molecular solid

[D] none of these

Answer: an emulsion

73 Quick silver is another name for

[A] Mercury

[B] Copper

[C] Silver

[D] Aluminium

Answer: Mercury

74 Which one of the following contains maximum percentage of nitrogen by mass?

[A] Ammonium nitrate

[B] Ammonium carbonate

[C] Urea

[D] Ammonium cyanide

Answer: Urea

75 The National Chemical Laboratory(India) is located in

[A] Pune

[B] Hyderabad

[C] Bengaluru

[D] Mumbai

Answer: Pune

76 Camphor can easily be purified by the process of

[A] Sedimentation

[B] Sublimation

[C] Distillation

[D] Crystallization

Answer: Sublimation

77 Broken glass that is used in the manufacture of glass is called

[A] Cullet

[B] Waste glass

[C] Raw material

[D] Batch

Answer: Waste glass

78 Which one of the following is a protein fibre?

[A] Silk

[B] Cotton

[C] Nylon

[D] Polyester

Answer: Silk

79 Who was the father of chemistry?

[A] Cavendish

[B] Urey

[C] Robert Boyle

[D] Lister

Answer: Cavendish

80 What is the most common element in the universe?

[A] Hydrogen

[B] Helium

[C] Oxygen

[D] Iron

Answer: Hydrogen

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