nitric acid does not produce hydrogen gas when reacts
with metal .
why?
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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)
Hydrogen reacts with oxygen and formed Water....