Question

state reason for the following: ( a) reaction of nitric acid with metals generally does not evolve hydrogen gas.

Answer 1

1.Nitric acid(HNO3) is a strong oxidising agent. The Hydrogen gas produced during its reaction with metal gets oxidised to H2O, hence no hydrogen gas is produced. Instead it evolves nitric oxides such as  NO2,NO etc. For Eg: Cu(s) + 4HNO3(aq)--->Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l) .
2.Nitric acid being strong oxidising agent, as soon as the hydrogen formed, is is oxidised to water and nitric acid is reduced to any of the nitrogen oxides hence we do not get hydrogen

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