Question

Dilute hydrochloric acid $\text{(HCl)}$ reacts with metals to evolve _____ gas along with the formation of corresponding metal salt.

• A. oxygen
• B. hydrogen
• C. nitrogen
• D. chlorine

Answer 1

The correct option is B hydrogen

Acids react with metals to produce the respective metal salt along with hydrogen gas. The general form of the reaction is given below:

$\text{Acid (aq)}+\text{Metal (s)}\to \text{Salt (aq)}+\text{Hydrogen (g)}$

For example:
When hydrochloric acid reacts with zinc, it produces zinc chloride along with the evolution of hydrogen gas.

The chemical reaction is given below:

$2\text{HCl (aq)}+\text{Zn (s)}\to {\text{ZnCl}}_2\text{(aq)}+{\text{H}}_2\text{(g)}$