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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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gas. For example,
`Zn(s)+2HCl(aq)toZnCl_(2)(aq)+H_(2)(g)`
The gas burns with a pop sound when a burning candle is brought near it. For details, consult text part (Section 2.3.).
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