11. Heavy water is :
(a) deuterium oxide
(b) PH7
(c) rain water
(d) tritium oxide
12. The element common to all acids is :
(a) hydrogen
(b) carbon
(c) sulphur
(d) oxygen
13. Carbon, diamond and graphite are together called :
(a) allotropes
(b) isomers
(c) isomorphs
(d) isotopes
14. Permanent hardness of water may be removed by the addition of :
(a) sodium carbonate
(b) alum
(c) potassium permanganate
(d) lime
15. Soda water contains :
(a) carbonic acid
(b) sulphuric acid
(c) carbon dioxide
(d) nitrous acid
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General Chemistry » Exercise - 19. Among the various allotropes of carbon : (a) coke is the hardest, graphite is the softest (b) diamond is the hardest, coke is the softest (c) diamond is the hardest, graphite is the softest (d) diamond is the hardest, lamp black is the softest- General Chemistry » Exercise - 119. Diamond is an allotropic form of : (a) germanium (b) carbon (c) silicon (d) sulphur
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