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)