Chemistry TOP 30 MCQs for all exams questions and answers

11. Heat resistant variety of glass is—

a) Pyrex glass

b) Hard glass

c) Flint glass

d) None of these

 

12. Among the following iron ores, the highest percentage of iron content is found in—

a) Haemetite

b) Magnetite

c) Limnonite

d) None of these

 

13. Pasteurisation of milk means–

a) heating of milk to above 72°C

b) heating of milk to above 62°C

c) cooling of milk to about 62°C

d) cooling of milk to about 10°C

 

14. Aluminium can be purified by

a) oxidation

b) distillation

c) electrolysis

d) ozonolysis

 

15. Impure camphor is purified by

a) sublimation

b) fractional crystallisation

c) fractional distillation

d) steam distillation

 

16. Greenhouse effect is caused by

a) nitrogen

b) carbon dioxide

c) carbon monoxide

d) nitrogen dioxide

 

17. Type metal used in printing press is an alloy of

a) lead and copper

b) lead and antimony

c) lead and bismuth

d) lead and zinc

 

18. Sour taste of ‘Coca Cola’ is due to the presence of

a) acetic acid

b) phosphoric acid

c) hydrochloric acid

d) formic acid

 

19. Bhopal gas tragedy is associated with leakage of

a) carbon dioxide

b) nitrogen dioxide

c) sulphur dioxide

d) methyl isocyanate

 

20. Iodized salt is beneficial for

a) lowering of blood pressure

b) prevention of dehydration

c) thyroid function

d) salivary glands

 

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