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Stabilisation energy of octahedral complex with d⁷ configuration
A) 1.8 $∆_{o}$ with one unpaired electron
B) 1.8 $∆_{o}$ with three unpaired electrons
C) 0.8 $∆_{o}$ with one unpaired electron
D) 0.8 $∆_{o}$ with three unpaired electrons

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An Intiative by Sri Chaitanya

A and D

A and B

C and D

B and C

answer is A.

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Detailed Solution

Case-I: weak field ligand, $∆_{o} < P$

$d^{7}, t_{2 g}^{5} e_{g}^{2}$ (three unpaired electrons)

CFSE = $5 (- 0 .4 Δ_{o}) + 2 (+ 0 .6 Δ_{o})$

CFSE = $- 0 .8 Δ_{o}$

Case-II: strong field ligand, $∆_{o} < P$

$d^{7}, t_{2 g}^{6} e_{g}^{2}$ (one unpaired electrons)

CFSE = $6 (- 0 .4 Δ_{o}) + 2 (+ 0 .6 Δ_{o})$

CFSE = - 1.8 $∆_{0}$

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