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Chemistry Question on coordination compounds

In which of the following coordination entities the magnitude of Δ0\Delta_0 (CFSE in octahedral field) will be maximum? (At. no. of Co = 27)

A

[Co(H20)6]3+{[Co (H20)6]^{3+}}

B

[Co(NH3)6]3+[Co(NH_3)_6]^{3+}

C

[Co(CN)6]3−[Co (CN)_6]^{3-}

D

[Co(C2O4)3]3−[Co(C_2O_4)_3]^{3-}

Answer

[Co(CN)6]3−[Co (CN)_6]^{3-}

Explanation

Solution

As in all the given complex the central metal atom is same and contains same number of d electrons, thus CFSECFSE is decided by ligands. In case of strong field ligand, CFSECFSE is maximum. CN−CN^- is a strong field ligand, Hence, in [Co(CN)6]3−CFSE[Co(CN)_6 ]^{3-}CFSE is maximum. The magnitude ofΔoct\Delta_{oct} will be maximum in [Co(CN)6]3−.[Co(CN)_6 ]^{3-}.