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Q. Why Hydrogen gas is not evolved when most of the metals react with nitric acid?

Dear Student

Hydrogen produced during the reaction of metal with nitric acid is oxidized to water due to the strong oxidizing power of HNO₃ and instead of hydrogen, nitric oxides (NO or NO₂ or N₂O) are evolved. 

Example: $4Fe + 10HN{O}_3 \underset{}{\to } 4Fe(N{O}_3{)}_2 + N_{2}O + 5H_{2}O$