______ acid is not used in preparation of carbon dioxide.

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Solution

Dilute sulphuric acid reacts with calcium carbonate. But it is not used because the calcium sulphate which is formed during the reaction is insoluble in water. It covers the marble chips and stops the reaction.
$H_{2} {SO}_{4} (aq) + {CaCO}_{3} (s) \to {CaSO}_{4} (s) + H_{2} {CO}_{3} (aq)$
Therefore, dilute sulphuric acid is not used in the preparation of carbon dioxide.

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