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Q.

The electron distribution in $d^{n}$ coordination complexes depends on magnitude of crystal field splitting, ( $∆_{0}$ ) and pairing energy (P). The condition which favours formation of high spin complexes is :

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a

$t_{2 g}^{4} e_{g}^{0}$

b

$Δ_{o} > P$

c

$Δ_{o} = P$

d

$Δ_{o} < P$

answer is B.

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Detailed Solution

High spin complex means pairing does not occur.
This condition is possible only in presence of weak field ligands.
In octahedral complexes energy of $t_{2 g} < e_{g}$ .
In presence of weak field ligand, electrons progressively enter to $t_{2 g}$ until each of the three orbitals of $t_{2 g}$ are half-filled then fourth and fifth electrons enter into $e_{g}$ levels are half filled.
This condition is possible when $Δ_{o} < P$ .

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