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Which gas is usually liberated when and acid reacts with a metal? Illustrate with an example.

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

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Metal + Acid → Salt + H2 ↑

Zn + 2HCl → ZnCl2 + H2 

On putting burning match stick near mouth of test tube liberated gas burn with pop sound. 

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