CBSE Class 11 Chemistry Short Questions & Answers

41 The chemical name of quartz is

[A] Sodium silicate

[B] Sodium phosphate

[C] Calicum phosphate

[D] Calcium oxide

Answer: Sodium silicate

42 Which among the following is in liquid state at normal room temperature?

[A] Mercury

[B] Phosphorous

[C] Sodium

[D] Copper

Answer: Mercury

43 What is the first element of periodic table?

[A] Hydrogen

[B] Neon

[C] Sodium

[D] Helium

Answer: Hydrogen

44 The chemical name of laughing gas is

[A] Nitrous oxide

[B] Nitrogen peroxide

[C] Nitric oxide

[D] Nitrogen dioxide

Answer: Nitrous oxide

45 What is the chemical name of Green vitriol?

[A] Iron sulphate

[B] Calcium cyanamide

[C] Calcium carbonate

[D] Calcium phosphate

Answer: Iron sulphate

46 The substance used in the manufacture of high voltage insulators is

[A] Artificial rubber

[B] Silicons

[C] Natural rubber

[D] Silicon carbide

Answer: Silicons

47 Retinol is the chemical name of

[A] Vitamin A

[B] Vitamin K

[C] Vitamin E

[D] Vitamin D

Answer: Vitamin A

48 Which one of the following has the highest fuel value?

[A] gasoline

[B] hydrogen

[C] charcoal

[D] natural gas

Answer: hydrogen

49 Among the following elements, which one is not present in a pure sugar?

[A] Nitrogen

[B] oxygen

[C] Carbon

[D] hydrogen

Answer: Nitrogen

50 Chloro-fluro-carbon gases are not used in which of the following?

[A] air-conditioning

[B] aerosol sprays

[C] refrigerators

[D] fire-extinguishers

Answer: fire-extinguishers

51 Which one of the following is used in preparing match sticks?

[A] Red phosphorus

[B] Sodium bicarbonate

[C] Chile saltpeter

[D] Indian salpetre

Answer: Red phosphorus

52 Which one of the following is present in the emission from “unleaded petrol”?

[A] ethylene

[B] hydrocarbons

[C] carbon monoxide

[D] carbon dioxide

Answer: hydrocarbons

53 Which one of the following is a major constituent of Biogas ?

[A] methane

[B] nitrogen dioxide

[C] Carbon dioxide

[D] hydrogen

Answer: methane

54 Which one of the following materials is suitable for water purification?

[A] Zeolites

[B] Quartz

[C] Silicones

[D] Asbestos

Answer: Zeolites

55 Which one of the following is an element which never exhibits positive oxidation state in any of its compounds?

[A] Fluorine

[B] Carbon

[C] Oxygen

[D] Chlorine

Answer: Fluorine

56 Which one of the following correctly defines the state of glass?

[A] Crystalline solid

[B] Super cooled liquid

[C] Condensed gas

[D] Liquid crystal

Answer: Super cooled liquid

57 Nail polish remover contains

[A] Acetone

[B] Acetic acid

[C] Benzeme

[D] Petroleum ether

Answer: Acetone

58 Which of the following elements behave chemically both as metal and non metal?

[A] Xenon

[B] Argon

[C] Boron

[D] Carbon

Answer: Boron

59 Vinegar is trade name of

[A] Carbon tetrachloride

[B] Acetic acid

[C] Chloroform

[D] Ethyl alcohol

Answer: Acetic acid

60 The cathode of a lead storage battery is made up of

[A] Lead

[B] Manganese dioxide

[C] Lead oxide

[D] Zinc

Answer: Lead

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