When a metal carbonate is treated with dilute hydrochloric acid, the gas liberated is:

hydrogen

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chlorine

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carbon monoxide

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carbon dioxide

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Solution

The correct option is D carbon dioxide
When metal carbonate is treated with dilute hydrochloric acid, the products formed are salt, water and carbon dioxide.
$C O_{2}$ gas that is produced causes effervescence or bubbling.
Thus, the correct answer is option (D).

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