why isn't hydrogen gas evolved when most metals react with nitric acid?

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Solution

Because Nitric acid is a strong oxidizing agent, it oxidize H₂ to H₂O.
Thus nitric acid tends to produce nitrogen oxides and water rather than hydrogen while reacting with metals.

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why isn't hydrogen gas evolved when most metals react with nitric acid?

Because Nitric acid is a strong oxidizing agent, it oxidize H2 to H2O. Thus nitric acid tends to produce nitrogen oxides and water rather than hydrogen while reacting with metals.

Because Nitric acid is a strong oxidizing agent, it oxidize H₂ to H₂O.
Thus nitric acid tends to produce nitrogen oxides and water rather than hydrogen while reacting with metals.