Question

A metal on reaction with dilute acid liberates gas which burns with a pop sound.

• A. hydrogen
• B. oxygen
• C. carbon dioxide
• D. carbon monoxide

Answer 1

The correct option is A hydrogen

Metals on reaction with acids produces metal salt and hydrogen gas.

For example, sodium (a metal) on reaction with hydrochloric acid produces sodium chloride (metal salt) and hydrogen gas.
This can be represented as:
$\text{Sodium + Hydrocholoric acid}$
$\to \text{Sodium chloride + Hydrogen gas}$

The evolved hydrogen gas burns with a characteristic pop sound.