Which of the following can be used to prepare hydrogen gas in the laboratory?

Mercuric oxide

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Acid plus zinc

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Potassium chlorate

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Carbon disulfide

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Benzene

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Solution

The correct option is D Acid plus zinc
Metals when reacts with acid forms salts and liberate hydrogen gas.
Therefore, acid plus zinc can be used to prepare hydrogen gas in the laboratory.
$Z n + 2 H C l ⟶ Z n C l_{2} + H_{2} ↑$

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