Which is high spin complex?

{[C o F_{6}]}^{3 -}

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{[F e {(C N)}_{6}]}^{3 -}

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{[F e {(C N)}_{6}]}^{4}

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None of these

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Solution

The correct option is B ${[C o F_{6}]}^{3 -}$
$E^{-}$ is a weak field ligand whereas ${C N}^{-}$ is a strong field ligand.
Weak field ligands cannot cause forcible pairing of electrons within d-subshell and thus form high spin complexes.

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I I I : [C o F_{6}]^{3 -}

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