Chemistry TOP 30 MCQs for all exams questions and answers

21. The acid rain destroys vegetation because it contains

a) nitric acid

b) ozone

c) carbon monoxide

d) sulphuric acid

22. Diamonds are glittering and attractive because light incident on

them undergoes

a) highest refraction

b) multiple internal reflections

c) multiple surface reflections

d) hundred percent transmission

 

23. The substance most commonly used as a food preservative is

a) sodium carbonate

b) tartaric acid

c) acetic acid

d) sodium salt of benzoic acid

 

24. Catalyst is a substance which

a) increases the rate of the reaction

b) decreases the rate of reaction

c) has no action on the rate of the reaction

d) None of these

 

25. Which of the following gases is most toxic ?

a) Carbon dioxide

b) Carbon monoxide

c) Sulphur dioxide

d) Chlorine

 

26. The acid used in lead storage cells is

a) phosphoric acid

b) hydrochloric acid

c) nitric acid

d) sulphuric acid

 

27. ‘Plaster of Paris’ is made by partial dehydration of

a) epsom salt

b) gypsum salt

c) blue vitriol

d) green vitriol

 

28. Water can be separated from alcohol water mixture by

a) decantation

b) evaporation

c) distillation 

d) sublimation

 

29. Who discovered the atom bomb?

a) Madam Curie

b) Pierre Curie

c) Otto Hahn

d) Albert Einstein

 

30. Which one of the following organic compounds has fruity smell?

a) Alcohol

b) Aldehyde

c) Ester

d) Ether

 

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