Question

2.
Generally when metals are treated with mineral acids, hychogen gas is libera-
led but when metals (exceps Mn and mg)
trealed with dil . HNO₃, hychogen is not
liberated, why?​

Answer 1

Answer:

As nitric acid is strong oxidising agent ,it oxidises hydrogen gas to form water when reacting with metals. Thus,metals do not liberate H gas with dil. nitric acid.

Answer 2

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. The nitric acid oxidises this hydrogen to water and itself gets reduced to NO2 or NO orN2O. So, in the reaction of metals (except Mn and Mg) with dilute nitric acid, no hydrogen gas is evolved.