The anhydride of carbonic acid is:

$C O$

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$C O_{2}$

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$C_{3} O_{2}$

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$None of these$

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Solution

The correct option is B
$C O_{2}$

An aqueous solution of carbon dioxide behaves as a weak acid which is due to the formation of carbonic acid.

$C O_{2} + H_{2} O ⇌ H_{2} C O_{3}$

This is why $C O_{2}$ is also known carbonic anhydride.

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