Which of the following is true acid anhydride?

A l_{2} O_{3}

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C O

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C a O

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C O_{2}

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Solution

The correct option is C $C O_{2}$
An anhydride is a compound that is similar yet structurally different from the species it is derived from and water is removed internally from its firm structure.
$C O_{2}$ dissolves in water to give $H_{2} C O_{3}$ , a carbonic acid. It is a true acidic anhydride. $A l_{2} O_{3}$ is amphoteric both acid oxide and basic oxide in nature.
$C O$ is neutral while $C a O$ is a basic oxide.

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