# Which gas is usually liberated when an acid reacts with a metal?

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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 usually liberated when an acid reacts with a metal For example: When zinc granules react with dilute sulphuric acid, then hydrogen gas is liberated and zinc sulphate solution is formed

$$Zn+H_2SO_4\rightarrow ZnSO_4+H_2$$

The evolved hydrogen gas can be tested by taking a burning candle near gas filled bubbles. If candle burns with pop sound, it confirms the evolution of hydrogen gas