How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal? [2 MARKS]

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Solution

Explanation: 2 Marks

Hydrogen gas is evolved when hydrochloric acid reacts with an active metal such as sodium, potassium, calcium or magnesium.

Example- $M g (s) + 2 H C l (a q) \to M g C l_{2} (a q) + H_{2} (g)$

In order to test the gas, bring either a burning match stick or candle near the gas.Then gas will immediately catch fire.

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