hydrogen gas is not evolved when zinc metal reacts with dil. HNO₃

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Solution

This is because nitric acid acts as an oxidizing agent and oxidizes hydrogen gas produced in the reaction to form water. At the same time, nitric acid itself gets reduced to form nitrogen oxides such as nitrous oxide (N₂O), nitric oxide (NO), and nitrogen dioxide (NO₂).
3Zn + 8HNO₃ â†’ 3Zn(NO₃)₂ + 2NO + 4H₂O

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hydrogen gas is not evolved when zinc metal reacts with dil. HNO3

hydrogen gas is not evolved when zinc metal reacts with dil. HNO₃