Give reasons for the following : (a) Reaction of nitric acid with metals generally does not evolve hydrogen gas. (b) For making gold ornaments, 22 carat gold is preferred to 24 carat gold.
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- It is because HNO3 is a strong oxidizing agent. It oxidises H2 to produce water and itself gets reduced to any of its oxides such as N2O(dinitrogen monoxide),NO(nitrogen monoxide) or NO2(nitrogen dioxide). iii) Pure gold is 24 carat and is very soft. Therefore it is not suitable for making jewellery.
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