JEE MAIN - Chemistry (2022 - 29th July Morning Shift - No. 24)
$$\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}$$ should be an inner orbital complex. Ignoring the pairing energy, the value of crystal field stabilization energy for this complex is $$(-)$$ ____________ $$\Delta_{0}$$. (Nearest integer)
Answer
2
Explanation
In $\left[\mathrm{Fe}(\mathrm{CN})^{6}\right]^{3-}$, $\mathrm{Fe}$ is present in (+3) oxidation state $\mathrm{Fe}(\mathrm{III}) \Rightarrow$ inner orbital complex $\Rightarrow d^{5}$ (with pairing)
Configuration $\Rightarrow t_{2 g}^{5}$
CFSE $=5 \times \frac{-2}{5} \Delta_{0}=-2 \Delta_{0}$
Configuration $\Rightarrow t_{2 g}^{5}$
CFSE $=5 \times \frac{-2}{5} \Delta_{0}=-2 \Delta_{0}$
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