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Question

For which of the following $d^{n}$ configuration of octahedral complex(ex), cannot exist in both high spin and low spin forms?
$d^{3}$
$d^{6}$
$d^{5}$
$d^{8}$

A

d^{3}

B

d^{6}

C

d^{8}

D

d^{5}

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Solution

Verified by Toppr

When the outer electronic configuration of the central metal ion in the complex is $d^{1}$ to $d^{3}$ , the complex is inner orbital complex.
This is irrespective of the strength of the ligand field.
When the outer electronic configuration of the central metal ion in the complex is $d^{8}$ to $d^{10}$ , the complex is outer orbital complex.
This is irrespective of the strength of the ligand field.
Thus, $d^{3}$ and $d^{8}$ configuration of octahedral complex(es), cannot exist in both high spin and low spin forms.

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