JEE MAIN - Chemistry (2025 - 22nd January Morning Shift - No. 17)
In which of the following complexes the CFSE, $\Delta_o$ will be equal to zero?
$\mathrm{K}_3\left[\mathrm{Fe}(\mathrm{SCN})_6\right]$
$\left[\mathrm{Fe}(\mathrm{en})_3\right] \mathrm{Cl}_3$
$\left[\mathrm{Fe}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Br}_2$
$\mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]$
Explanation
For complex $\mathrm{K}_3\left[\mathrm{Fe}(\mathrm{SCN})_6\right]$
_22nd_January_Morning_Shift_en_17_1.png)
Calculation of CFSE
$$ \begin{aligned} & =(-0.4 \times 3+0.6 \times 2) \Delta_0 \\\\ & =0 \Delta_0 \end{aligned} $$
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