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

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When a metal reacts with an acid, usually hydrogen gas is liberated. For example, zinc reacts with dilute sulphuric acid as follows:
Zn   H2SO4    ----->   ZnSO4 +              H2
Zitc   Sulphuric acid    Zinc sulphite         Hydrogen
The hydrogen gas evolved can be tested by passing the gas through soap solution and then bringing a burning candle near the soap bubble filled with the gas. The soap bubble burst and the hydrogen gas burns with a pop sound.

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