Which thing is required to identify the gas evolved when dilute hydrocloric acid reacts with zinc metal?

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Solution

Reaction:
Zn + 2HCl $\to$ ZnCl₂+ H₂

The gas evolved is hydrogen.
If we bring a matchstick close to the mouth of the test tube evolving hydrogen gas then there is instant spark of fire because hydrogen gas catches fire and produces a pop sound. This is due to hydrogen reacts with oxygen present in air to form water vapours.

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