The atomicity of CO₃^2- is:

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answer is C.

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Detailed Solution

The atomicity of CO₃^2- is 4.
In carbonate ion ( CO₃^2-) one atom of carbon and three atoms of oxygen are bonded to one another. Since altogether four atoms are involved in the molecule, its atomicity is 4. Molecules having atomicity four are known as tetratomic molecules.

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