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General Chemistry – 1 – 3

11. Heavy water is :

(a) deuterium oxide
(b) PH7
(c) rain water
(d) tritium oxide

ANSWER

EXPLANATION

12. The element common to all acids is :

(a) hydrogen
(b) carbon
(c) sulphur
(d) oxygen

ANSWER

EXPLANATION

13. Carbon, diamond and graphite are together called :

(a) allotropes
(b) isomers
(c) isomorphs
(d) isotopes

ANSWER

EXPLANATION

14. Permanent hardness of water may be removed by the addition of :

(a) sodium carbonate
(b) alum
(c) potassium permanganate
(d) lime

ANSWER

EXPLANATION

15. Soda water contains :

(a) carbonic acid
(b) sulphuric acid
(c) carbon dioxide
(d) nitrous acid

ANSWER

EXPLANATION


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