Crystal field theory

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Question

For the complex, $K_{3} [{FeF}_{6}]$ it is observed that $Δ_{o} < P .$ Crystal field stabilization energy is equal to

Moderate

Solution

$Δ_{o} < P,$ Weak field ligand, High Spin complex
$\begin{array}{l} {Fe}^{+ 3} - 3 d^{5} - n = 5 . ....... t_{2 g}^{3} {eg}^{2} \\ CFSE = 3 (- 0 .4 Δ_{o}) + 2 (+ 0 .6 Δ_{o}) =zero \end{array}$

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