Give reasons:
Hydrogen gas is not evolved when a aluminium metal reacts with nitric acid.

Hydrogen gas is not evolved when a metal (Aluminium) reacts with nitric acid because nitric acid is a strong oxidizing agent. Hence, it oxidizes the hydrogen to produce water.

Nitric acid (HNO₃) reduces itself to any of the nitrogen oxides (N₂O, NO, NO₂) after oxidizing the H₂ to water.

[Exception: Magnesium (Mg) and manganese (Mn) react with very dilute HNO₃ to produce H₂ gas.]