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Chemistry Question on coordination compounds

What is the most likely configuration of the cobalt d-electrons for the species, [CoCl6]3−[CoCl_6]^{3-} and [Co(NO2)6]3−[Co(NO_2)_6]^{3-}?

A

[CoCl6]3−[CoCl_6]^{3-} : low spin; [Co(NO2)6]3−[Co(NO_2)_6]^{3-} : low spin

B

[CoCl6]3−[CoCl_6]^{3-} : high spin; [Co(NO2)6]3−[Co(NO_2)_6]^{3-} : low spin

C

[CoCl6]3−[CoCl_6]^{3-} : low spin; [Co(NO2)6]3−[Co(NO_2)_6]^{3-} : high spin

D

[CoCl6]3−[CoCl_6]^{3-} : high spin; [Co(NO2)6]3−[Co(NO_2)_6]^{3-} : high spin

Answer

[CoCl6]3−[CoCl_6]^{3-} : high spin; [Co(NO2)6]3−[Co(NO_2)_6]^{3-} : low spin

Explanation

Solution

Weak field ligands (like Cl−Cl^-) giving low value of Δo\Delta_{o}, form high spin octahedral complexes whereas strong field ligands (like NO2−NO^-_ 2) give rise to low spin (spin paired) complexes.