Coordination number of cobalt in $[C o (C_{2} O_{4})_{3}]^{3 -}$ is:

2

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6

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5

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4

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Solution

The correct option is C $6$
In the given complex the coordination number is equal to the number of coordinating ligands sites. In $[C o (C_{2} O_{4})_{3}]^{3 -}$ the ligand $C_{2} O_{4}^{2 -}$ is a bidentate ligand and therefore the coordination nuber is 6. The correct option is B.

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