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Preparation of Hydrogen

Which gas is ...

Question

Which gas is usually liberated when an acid reacts with a metal?

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Solution

Usually, hydrogen gas is liberated when an acid reacts with a metal. Eg.
zinc + sulphuric acid $\to$ zinc sulphate + hydrogen
$Z n + H_{2} S O_{4} \to Z n S O_{4} \to + H_{2} (g a s)$

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