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Which of the following complex ions has electrons that are symmetrically filled in both $t_{2 g}$ and $e_{g}$ orbitals?

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${[{CoF}_{6}]}^{3 -}$

${[Mn (CN)_{6}]}^{4 -}$

${[{FeF}_{6}]}^{3 -}$

${[Co {({NH}_{3})}_{6}]}^{2 +}$

answer is C.

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Detailed Solution

Both the $t_{2 g}$ and $e_{g}$ orbitals of ${[{FeF}_{6}]}^{3 -}$ are symmetrically filled with electrons.

A weak ligand is F. The complex will therefore be high spin complex.

The outer electronic configuration of Fe(III) is $3 d^{5}$ as, which may also be represented as $t_{2 g}^{3} e_{g}^{2}$ .

Thus, the correct option is C.

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