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NEET levelSingle correct optionDifficulty 1 of 3cc007

In an octahedral complex of a $d^{5}$ metal ion with weak-field ligands (high spin), the electronic configuration is

A $t_{2 g}^{3} e_{g}^{2}$
B $t_{2 g}^{2} e_{g}^{3}$
C $t_{2 g}^{5} e_{g}^{0}$
D $t_{2 g}^{4} e_{g}^{1}$

Answer: A

Weak-field ligands give a small

Δ_{o}

, smaller than the pairing energy, so electrons occupy all five orbitals singly (Hund's rule) before pairing. This gives three electrons in

t_{2 g}

and two in

e_{g}

.

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