CBSE class 11 Chemistry MCQs & Answers | CBSE class 11 Chemistry Quiz

81 The concept of an electrolyte in water was described by

[A] Arrhenius

[B] Debye

[C] Faraday

[D] Ohm

Answer: Arrhenius

82 The acid present in lemon is

[A] citric acid

[B] tartaric acid

[C] lactic acid

[D] marlic acid

Answer: citric acid

83 The solute in a solution can be separated by

[A] decantation

[B] evaporation

[C] filtration

[D] sedimentation

Answer: evaporation

84 The major constituent of air is

[A] Nitrogen

[B] Oxygen

[C] Carbon dioxide

[D] Hydrogen

Answer: Nitrogen

85 The chief source of aluminium is

[A] Feldspar

[B] Cargolite

[C] Bauxite

[D] Haematite

Answer: Bauxite

86 Another name for mercurous chloride is

[A] Plaster of paris

[B] Blue vitriol

[C] Amalgam

[D] Calomel

Answer: Plaster of paris

87 Cooking oil can be converted into vegetable ghee by the process of

[A] Distillation

[B] Hydrogenation

[C] Oxidation

[D] Crystallization

Answer: Hydrogenation

88 Charcoal is

[A] Hygroscopic

[B] Amorphous

[C] Crystalline

[D] None of these

Answer: Amorphous

89 Who discovered radioactivity?

[A] Henri Becquerel

[B] John Dalton

[C] Roentgen

[D] Marie Curie

Answer: Henri Becquerel

90 Which one among the following is used as a moderator in nuclear reactors?

[A] Heavy water

[B] Hydrogen peroxide

[C] Heavy hydrogen

[D] Ozone

Answer: Heavy water

91 Which of the following substance is highly plastic?

[A] Clay

[B] Granite

[C] Quartz

[D] Mica

Answer: Clay

92 Carbon occurs in nature in the purest form as

[A] Diamond

[B] Graphite

[C] Carbon black

[D] Coal

Answer: Diamond

93 A polymeric substance used to make parachute is

[A] Viscose

[B] Terylene

[C] Rayon

[D] Cotton

Answer: Viscose

94 Which variety of coal contains the highest percentage of carbon?

[A] Lignite

[B] Peat

[C] Anthracite

[D] Bituminous

Answer: Anthracite

95 The oxide of Nitrogen used in medicine as anaesthetic is

[A] Nitrogen pentoxide

[B] Nitrous oxide

[C] Nitrogen dioxide

[D] Nitric oxide

Answer: Nitrogen pentoxide

96 Which one of the following metals is found in plaster of paris?

[A] Sodium

[B] Calcium

[C] Magnesium

[D] Pottasium

Answer: Calcium

97 The major ingrediation of leather is

[A] Collagen

[B] nuclei acid

[C] Carbohydrate

[D] Polymer

Answer: Collagen

98 Which one of the following types of glass can cut off ultraviolet rays?

[A] crookes glass

[B] jena glass

[C] pyrex glass

[D] soda glass

Answer: crookes glass

99 Select the one which is not a mixture?

[A] Distilled water

[B] LPG

[C] Gasoline

[D] Air

Answer: Distilled water

100 What is the most common soil in sea water?

[A] Magnesium sulphate

[B] Calcium carbonate

[C] Sodium chloride

[D] Potassium chloride

Answer: Sodium chloride

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