$\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}$ 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 (integer)
2
Solution
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)
<br/><br/>
Configuration $\Rightarrow t_{2 g}^{5}$
<br/><br/>
CFSE $=5 \times \frac{-2}{5} \Delta_{0}=-2 \Delta_{0}$
About this question
Subject: Chemistry · Chapter: Coordination Compounds · Topic: Ligands and Coordination Number
This question is part of PrepWiser's free JEE Main question bank. 173 more solved questions on Coordination Compounds are available — start with the harder ones if your accuracy is >70%.