Why is hydrogen gas not evolved when a metal reacts with nitric acid?
(N/A) Nitric acid $(HNO_{3})$ is a strong oxidizing agent. When a metal reacts with it,the hydrogen gas $(H_{2})$ produced is immediately oxidized to water $(H_{2}O)$ by the nitric acid. Simultaneously,the nitric acid itself gets reduced to various nitrogen oxides,such as nitrous oxide $(N_{2}O)$,nitric oxide $(NO)$,or nitrogen dioxide $(NO_{2})$.
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