How will you test the gas which is liberated when Hydrochloric acid reacts with an acid?

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Solution

When hydrochloric acid reacts with metals, it produces hydrogen gas.
$Z n + 2 H C l ⟶ {Z n C l}_{2} + 2 H_{2} ↑$
When a match stick lightened placed near hydrogen gas puts out with a pop sound.

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