Question

Nitric acid will never give hydrogen gas when it reacts with acid.Why?

Answer 1

Nitric acid reacts with metal but do not release hydrogen gas. The action of nitric acid on a metal usually results in reduction of the acid (i.e., a decrease in the oxidation state of the nitrogen). Nitric acid is a strong oxidizing agent. So as soon as hydrogen gas is formed in the reaction between a metal and nitric acid, the nitric acid oxidizes hydrogen gas to water and itself get reduced to any of nitrogen oxides that is reduction of acid itself. Thus nitric acid does not release hydrogen gas upon reaction with metals. But metal get oxidised on reaction with nitric acid.