Question

Why hydrogen gas is not evolved when metal react with nitric acid?????

Answer 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 evolvesnitric oxides such as NO2,NO etc
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Answer 2

Nitric acid (HNO3) is a strong oxidising agent . The hydrogen gas produced during its reaction with metal gets oxidising at H2O , hence no hydrogen gas is produced . Instead it evolves nitric oxides such as NO2, NO etc .