The crystal field splitting energy of complex is times that of the complex. Here is ________. (Assume ) [2026]

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Solution

Q.
The crystal field splitting energy of ${[Co {(oxalate)}_{3}]}^{3 -}$ complex is $' n'$ times that of the ${[Cr {(oxalate)}_{3}]}^{3 -}$ complex. Here $' n'$ is ________. (Assume $Δ_{o} ≫ P$ ) [2026]

Ans.
(2)

$Pairing energy neglected w.r.t. Δ_{o}$

${[Co {(ox)}_{3}]}^{3 -} : {Co}^{3 +} : d^{6}; t_{2 g}^{2, 2, 2} e_{g}^{0, 0}$

$CFSE = 6 \times (- 0.4 Δ_{0}) = - 2.4 Δ_{o}$

${[Cr {(ox)}_{3}]}^{3 -} : {Cr}^{3 +} : d^{3}; t_{2 g}^{1, 1, 1} e_{g}^{0, 0}$

$CFSE = 3 \times (- 0.4 Δ_{o}) = - 1.2 Δ_{o}$

$\frac{{(CFSE)}_{{Co}^{3 +}}}{{(CFSE)}_{{Cr}^{3 +}}} = 2$

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