Question

(2) Does zinc evolve H2 gas when it reacts with dilute HCl and dilute HNO3 ? Express
the reaction with the equation. If zinc does not reacts with some specific acids,
then give its reason.​

Answer 1

Answer:

Yes, zinc evolve H2 when reacts with Dil. HCl.

Zinc + HCl gives ZnCl2 +H2

But, Zn does not evolve H2 when reacted by HNO3. It evolves different forms of gases like NO2,N2O etc.

hope this helps you

Answer 2

Yes...zinc evolves H2 gas when it reacts with dilute HCl as well as HNO3

Zn + HCl → ZnCl2 + H2

Zinc reacts with dilute nitric acid to give zinc nitrate and hydrogen gas.

Zinc + nitric acid → Zinc nitrate + hydrogen

Zn(s)+2HNO 3 (aq)→Zn(NO3 ) 2 (aq)+H2(g)

But if reaction proceeds forward then zinc does not react with nitric acid because Nitric acid is a strong oxidising agent. It oxidises the hydrogen gas formed by the reaction of zinc with nitric acid to water and itself gets reduced to an oxide.

Thank You