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PYQ 1200 Q/A Part - 1
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PYQ 1200 Q/A Part - 5
Kerala PSC General Science Book Study Materials Page 307
Book's First Page132. 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) 306