Name the gas evolved when a metal reacts with a dilute acid.

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Solution

When a metal reacts with a dilute acid like HCl, HNO3 etc. hydrogen gas is evolved. The reaction can be shown as follows:
$2 M + d i l . 2 H C l ⟶ 2 M C l + H_{2} ↑$
Hydrogen gas can be identified by bringing a burning matchstick near the mouth of the test tube in which reaction takes place. Hydrogen gas will burn with a pop sound.

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