Identify the carbonate anion from the following options:

$C O_{3}^{2 -}$

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$H C O_{3}^{2 -}$

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$C O$

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$C O_{2}$

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Solution

The correct option is A
$C O_{3}^{2 -}$

$C O_{3}^{2 -}$ is a polyatomic anion. It is named as carbonate ion. When it combines with a metal it forms metal carbonate.

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