Question

why is hydrogen gas not liberated when metals are treated with nitric acid

Answer 1

Hey,

It is because nitric acid (HNO3) is a strong oxidising agent. So, as soon as hydrogen gas is formed in the reaction between ametal and dilute nitric acid.

For example:-
3Ag + 4HNO3 ——→ 3AgNO3 + NO + NO2 + 3 H2O

HOPE IT HELPS:-))

Answer 2

Generally, when metals are treated with mineral acids, hydrogen gas is liberated but when metals (except Mn and Mg) are treated with HNO3, hydrogen is not liberated, why? Nitric acid (HNO3) is a strong oxidising agent. So, as soon as hydrogen gas is formed in the reaction between a metal and dilute nitric acid