Which gas is produced when dilute hydrochloric acid reacts with a reactive metal? Write the chemical reaction when iron reacts with dilute $H_{2} S O_{4}$

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Solution

When dilute $H C l$ react with reactive metal like alkali metal or alkali earth metal, Hydrogen gas is liberated.
For example:
$M g + 2 H C l ⟶ M g C l_{2} + H_{2} ↑$
Reaction when Iron reacts with dilute $H_{2} S O_{4}$ .
$(0) F e (s) + H_{2} S O_{4} (a q) ⟶ + 2 F e S O_{4} (a q) + H_{2} (g)$

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