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Question

Identify the gas which is liberated when a reactive metal reacts with an acid.

A
Oxygen
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B
Hydrogen
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C
Carbon dioxide
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D
Carbon monoxide
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Solution

The correct option is B Hydrogen
Metals on reaction with acids liberate hydrogen gas. To test the hydrogen gas, a small flame/fire/ can be brought near to the hydrogen gas. The pop sound comes from the small explosion formed by the burning of hydrogen with oxygen.

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