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Which gas is usually liberated when an a...

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
E.g `Zn+2 HCl to ZnCl_2+ H_2`
When burning match stick is brought near the cylinder filled with hydrogen gas, it burns with a pop sound.
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