(c) Cobalt sulphate
(d) Nickel sulphate
Ans: (a)
231. Talc contains which of the following? [NDA 2008]
(a) Zinc, calcium and oxygen
(b) Calcium, oxygen and tin
(c) Magnesium, silicon and oxygen
(d) Zinc, tin and sulphur
Ans: (c)
232. Which one of the following mixtures is homogeneous? [NDA 2008]
(a) Starch and sugar
(b) Methanol and water
(c) Graphite and charcoal
(d) Calcium carbonate and calcium bicarbonate
Ans: (b)
233. Which one of the following laws explains the formation of carbon monoxide and carbon dioxide from carbon and
oxygen? [NDA 2008]
(a) Law of conservation of mass
(b) Law of multiple proportions
(c) Law of reciprocal proportions
(d) Law of definite proportions
Ans: (b)
234. Which one of the following is the most important characteristic of water to act as a good solvent? [NDA 2008]
(a) Purity of water
(b) Ionizing power of water
(c) Polar nature of water
(d) Dissolving power of water
Ans: (b)
235. When iron is left exposed in open air, it gets rusted. Which constituent(s) of air is/are responsible for rusting iron? [NDA
2008]
1) Oxygen gas present in air.
2) Moisture present in air.
3) Carbon dioxide gas present in air.
(a) 1 only
(b) 2 only
(c) 1 and 2
(d) 2 and 3
Ans: (c)
236. What is the composition of Nitrolim a chemical fertilizer? [NDA 2008]
(a) Nitrogen and limestone
(b) Calcium carbide and nitrogen
(c) Calcium carbide and carbon
(d) None of the above
Ans: (b)
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