132. An important use of nitrous acid is in
(a) the manufacture of explosives
(b) the manufacture of dyes
(c) refrigerators
(d) the preparation of drugs
Ans: (b)
133. Gold dissolves in aqua regia due to the formation of
(a) chloro auric acid
(b) auric chloride
(c) gold nitrate
(d) aurous chloride
Ans: (a)
134. The compound or nitrogen used in dry cells is
(a) ammonia
(b) ammonium nitrate
(c) ammonium chloride
(d) ammonium nitrite
Ans: (c)
135. In photography, the compound or nitrogen used is
(a) Potassium nitrate
(b) Silver nitrate
(c) Ammonium carbonate
(d) Ammonium bicarbonate
Ans: (b)
136. In the nitrogen cycle, denitrifying bacteria
(a) oxidise ammonia to nitrates
(b) convert nitrogen into ammonia
(c) oxidise ammonia to free nitrogen
(d) oxidise ammonia to oxides of nitrogen
Ans: (c)
137. CAN is used as (Calcium Ammonium Nitrate)
(a) an explosive
(b) a fertilizer
(c) a dye
(d) a bleaching agent
Ans: (b)
138. Which or the following gases is soluble in water and Is collected by the downward displacement or air?
(a) Carbon dioxide
(b) Sulphur dioxide
(c) Ammonia
(d) Hydrogen
Ans: (c)
139. The gas evolved when ammonium nitrate is heated is
(a) nitrogen
(b) nitric oxide
(c) nitrogen peroxide
(d) nitrous oxide
Ans: (d)
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