Carbonate ion is a __________ ion.

monovalent

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trivalent

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divalent

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pentavalent

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Solution

The correct option is C divalent
A carbonate ion consists of one atom of carbon and three atoms of oxygen. It has two unit negative charge.
The formula of carbonate ion is $C {O_{3}}_{3}^{2 -}$ . Since, the charge on the carbonate ion is -2, it is known as divalent ion.

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Carbonate ion is also known as a:

N a H {C O}_{3}

{CO}_{3}^{2 -}

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