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Chemistry Question on coordination compounds

Which of the following is diamagnetic?

A

[Fe(CN)6]3−[Fe(CN)_6]^{3-}

B

Co(Ox)3]3−Co(O_x)_3]^{3-}

C

[FeF6]3−[FeF_6]^{3-}

D

[CoF6]3−[CoF_6]^{3-}

Answer

Co(Ox)3]3−Co(O_x)_3]^{3-}

Explanation

Solution

[Fe(CN)6]3−[Fe(CN)_6]^{3-} has magnetic moment of a single unpaired electron whereas [FeF6]3−[FeF_6]^{3-} has a magnetic moment of five unpaired electrons.
[CoF6]3−[CoF_6]^{3-} is paramagnetic with four unpaired electrons while [Co(C2O4)3]3[Co(C_2O_4)_3]^3 is diamagnetic. This anomaly is explained by valence bond theory in terms of formation of inner and outer orbital coordination entities. [Co(C2O4)3]3−[Co(C_2O_4)_3]^{3-} is an inner orbital complexes having d2sp3d^2sp^3 hybridization.

So, the correct option is (B): Co(Ox)3]3−Co(O_x)_3]^{3-}