general science

Chemistry MCQ Questions and Answers page - 7

1.

Taj Mahal is greatly affected due to  :

Answer/ Hint      

Answer : B

Explanation :

2.

Chemical name of bleaching powder is  :

Answer/ Hint      

Answer : B

Explanation :

3.

The gas that usually causes explosions in coal mines is

Answer/ Hint      

Answer : D

Explanation :

4.

A powerful eye irritant present in smog is

Answer/ Hint      

Answer : C

Explanation :

5.

When water itself combines chemically with some element or mineral it is called

Answer/ Hint      

Answer : C

Explanation :

6.

KMnO4  can be used as a/an

Answer/ Hint      

Answer : D

Explanation :

7.

The chief source for the production of nitrogeneous fertilizers is  :

Answer/ Hint      

Answer : A

Explanation :

8.

Bleaching powder is prepared by passing  :

Answer/ Hint      

Answer : A

Explanation :

9.

Permanent – hardness of water may be removed by addition of

Answer/ Hint      

Answer : B

Explanation :

10.

One property of ammonia is

Answer/ Hint      

Answer : D

Explanation :

11.

Water gas is the mixture of

Answer/ Hint      

Answer : C

Explanation :

12.

Which of the following is not a  ‘green house gas’  ?

Answer/ Hint      

Answer : D

Explanation :

13.

Black lung disease occurs in people working in

Answer/ Hint      

Answer : D

Explanation :

14.

The chemical substance present in bones and teeth is

Answer/ Hint      

Answer : A

Explanation :

15.

If lime water is kept in the air, it turns milky due to presence of  :

Answer/ Hint      

Answer : A

Explanation :

16.

Brine refers to  :

Answer/ Hint      

Answer : A

Explanation :

17.

Which of the following imparts a blue colour to glass  ?

Answer/ Hint      

Answer : A

Explanation :

18.

The most common cause of pollution of air is

Answer/ Hint      

Answer : C

Explanation :

19.

Philosopher’s  wool is chemically

Answer/ Hint      

Answer : C

Explanation :

20.

Acid rain is caused due to pollution of atmosphere by

Answer/ Hint      

Answer : B

Explanation :

21.

Ferrous sulphate is used in water treatment as  a/an

Answer/ Hint      

Answer : C

Explanation :

22.

Sulphur dioxide level in the atmosphere can be reduced by using

Answer/ Hint      

Answer : D

Explanation :

23.

Glass is soluble in

Answer/ Hint      

Answer : D

Explanation :

24.

Sulphuric acid is

Answer/ Hint      

Answer : B

Explanation :

25.

Which of the following group of gases contribute to the  “Green House Effect”  ?

Answer/ Hint      

Answer : A

Explanation :

26.

A thick paste of cement, sand and water is called

Answer/ Hint      

Answer : C

Explanation :

27.

Which of the following is not a chemical reaction  ?

Answer/ Hint      

Answer : C

Explanation :

28.

Which of the following is used as anesthetic  ?

Answer/ Hint      

Answer : B

Explanation :

29.

Antacids are found in drugs that give relief to

Answer/ Hint      

Answer : B

Explanation :

30.

Browning of paper in old books is caused by

Answer/ Hint      

Answer : D

Explanation :

31.

The pair of compounds used as anaesthetic in medicines  :

Answer/ Hint      

Answer : B

Explanation :

32.

Antacid tablets consist of

Answer/ Hint      

Answer : B

Explanation :

33.

Interveinal necrotic spots on leaves appear due to

Answer : B

Explanation :

34.

The alkaloid naturally found in coffee, coco and cola nut is

Answer/ Hint      

Answer : D

Explanation :

35.

The chemical name of  “Plaster of Paris” commonly used for setting broken bones is

Answer/ Hint      

Answer : B

Explanation :

36.

Chemical formula of washing soda is

Answer/ Hint      

Answer : D

Explanation :

37.

Hydrochloric acid is also known as

Answer/ Hint      

Answer : C

Explanation :

38.

The gas produced in marshy places due to decomposition of vegetation is

Answer/ Hint      

Answer : D

Explanation :

39.

The chemical name of  “Hypo”  commonly used in photography is

Answer/ Hint      

Answer : A

Explanation :

40.

Aluminium salt commonly used to stop bleeding is

Answer/ Hint      

Answer : B

Explanation :

41.

Water gas is the combination of

Answer/ Hint      

Answer : A

Explanation :

42.

Carbon footprint can be reduced by

Answer/ Hint      

Answer : A

Explanation :

43.

Peroxyacetyl nitrate is a

Answer/ Hint      

Answer : D

Explanation :

44.

The term  ‘brown air’  is used for

Answer/ Hint      

Answer : B

Explanation :

45.

Most commonly used bleaching agent is

Answer/ Hint      

Answer : D

Explanation :

46.

Cyanide poisoning causes death in seconds because

Answer/ Hint      

Answer : D

Explanation :

47.

Photo chemical smog is a resultant of the reaction among

Answer/ Hint      

Answer : D

Explanation :

48.

The green colour seen in firework displays is due to the chloride salt of  :

Answer/ Hint      

Answer : C

Explanation :

49.

Chemical composition of heavy water is  :

Answer/ Hint      

Answer : D

Explanation :

50.

The acid which fails to liberate carbon dioxide from sodium bicarbonate is  :

Answer/ Hint      

Answer : D

Explanation :

51.

Dry ice is the solid form of  :

Answer/ Hint      

Answer : B

Explanation :

52.

The gas that causes suffocation and death when coal or coke is burnt in a closed room is

Answer/ Hint      

Answer : C

Explanation :

53.

Organic food is supposed to be better for human consumption because  :

Answer/ Hint      

Answer : B

Explanation :

54.

The main component of liquid bleach is  :

Answer/ Hint      

Answer : B

Explanation :

55.

Chile salt-peter is the common name of  :

Answer/ Hint      

Answer : A

Explanation :

56.

Stalactites and Stalagmites form due to the precipitation of  :

Answer/ Hint      

Answer : A

Explanation :

57.

An electrochemical cell which is used as a source of direct electrical current at constant voltage under standard conditions is called a  :

Answer/ Hint      

Answer : B

Explanation :

58.

An acid having basicity one is

Answer/ Hint      

Answer : B

Explanation :

59.

Which method will be employed to test the hardness of water  ?

Answer/ Hint      

Answer : C

Explanation :

60.

Which of the following is the main compound of voter ink  ?

Answer/ Hint      

Answer : A

Explanation :

61.

What do you understand by the term Espuma  ?

Answer/ Hint      

Answer : A

Explanation :

62.

Limestone is a raw material used by which industry  ?

Answer/ Hint      

Answer : C

Explanation :

63.

Copper substances when exposed to air gains a green coating due to the formation of  :

Answer : B

Explanation :

64.

Which of the following vitamins is generally excreted by human in urine  ?

Answer/ Hint      

Answer : A

Explanation :

65.

What is Zeolite  ?

Answer/ Hint      

Answer : A

Explanation :

66.

Which of the following is not soluble in water  ?

Answer/ Hint      

Answer : B

Explanation :

67.

Sea water is saltier than rain water because

Answer/ Hint      

Answer : C

Explanation :

68.

Which of the following is not a nitrogenous fertiliser  ?

Answer/ Hint      

Answer : D

Explanation :

69.

When iron rusts, its weight

Answer/ Hint      

Answer : B

Explanation :

70.

Silica gel is a

Answer/ Hint      

Answer : C

Explanation :

71.

What is the product formed when sodium bicarbonate is heated strongly  ?

Answer/ Hint      

Answer : A

Explanation :

72.

The chemical that is used to ripen mangoes is

Answer/ Hint      

Answer : B

Explanation :

73.

Which one of the following is commonly used for pulp bleaching in the paper industry  ?

Answer/ Hint      

Answer : C

Explanation :

74.

Which of the following gases is known as  “Laughing Gas”  ?

Answer/ Hint      

Answer : A

Explanation :

75.

The compound used in prickly-heat power to prevent excessive sweating is

Answer/ Hint      

Answer : A

Explanation :

76.

Which of the following acts as best adsorbent  ?

Answer/ Hint      

Answer : C

Explanation :

77.

Nitrogen fixation is a process of

Answer/ Hint      

Answer : D

Explanation :

78.

Which of the following molecules or ions involved in the Nitrogen Cycle do not contain oxygen atom  ?

Answer/ Hint      

Answer : B

Explanation :

79.

The chemical formula of Acetic acid is  _____________ .

Answer/ Hint      

Answer : B

Explanation :

80.

The common name of sodium tetraborate decahydrate is  ___________ .

Answer/ Hint      

Answer : C

Explanation :

81.

What is the chemical formula for Sodium Chloride (Salt)  ?

Answer/ Hint      

Answer : B

Explanation :

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