# Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?

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Hydrogen gas is liberated when an acid reacts with a metal.
For example, when zinc metal reacts with dilute sulphuric acid, hydrogen gas is evolved and salt zinc chloride is formed as:

$Zn+H_{2} SO_{4}\rightarrow \ Zn( SO_{4})_{2} \ +2H_{2} \uparrow$

It can be tested by bringing a burning candle near the gas. The candle continues burning with a pop sound.
Updated on 10-Oct-2022 12:46:40