The reaction of metal carbonates with acids liberates gas.

carbon dioxide

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oxygen

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hydrogen

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carbon monoxide

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Solution

The correct option is A carbon dioxide
The reaction of metal carbonates with acids leads to the evolution of carbon dioxide gas. Other products obtained are the corresponding salt and water.
$M g C O_{3} + 2 H C l \to M g C l_{2} + H_{2} O + C O_{2}$

Magnesium carbonate on reaction with hydrochloric acid forms magnesium chloride (salt) along with water and carbon dioxide.

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Which gas is evolved when acids react with metal carbonates?

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