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  4. Coordination number of Ni in [ Ni ( C 2 O 4)3]4- is

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Q. Coordination number of $Ni$ in $\left[ Ni \left( C _{2} O _{4}\right)_{3}\right]^{4-}$ is

VITEEEVITEEE 2010

Solution:

Coordination number of $Ni$ in $\left[ Ni \left( C _{2} O _{4}\right)_{3}\right]^{4-}$ is 6. This is because $C _{2} O _{4}^{2-}$ (oxalate) is a bidentate ligand and thus, each coordinated with the central atom at two sites.