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Metals like copper fail to evolve hydrog...

Metals like copper fail to evolve hydrogen gas on reacting with dilute nitric acid.

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Nitric acid is a strong oxidizing agent, it oxidizes `H_2` produced to water and itself gets reduced to any of the nitrogen oxides (`N_2O`, NO or `NO_2`). Thus, evolution of hydrogen gas is not observed when metals like copper react with nitric acid.
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