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JEE Mains · Chemistry · STD 12 - 5. Co-ordination chemistry

In which of the following complexes the CFSE, \(\Delta_{\mathrm{o}}\) will be equal to zero?

  1. A \(\left[\mathrm{Fe}(\mathrm{en})_3\right] \mathrm{Cl}_3\)
  2. B \(\mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]\)
  3. C \(\left[\mathrm{Fe}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Br}_2\)
  4. D \(\mathrm{K}_3\left[\mathrm{Fe}(\mathrm{SCN})_6\right]\)
Verified Solution

Answer & Solution

Correct Answer

(D) \(\mathrm{K}_3\left[\mathrm{Fe}(\mathrm{SCN})_6\right]\)

Step-by-step Solution

Detailed explanation

For complex \(\mathrm{K}_3\left[\mathrm{Fe}(\mathrm{SCN})_6\right]\) Calculation of CFSE \(\begin{aligned} & =(-0.4 \times 3+0.6 \times 2) \Delta_0 \\ & =0 \Delta_0 \end{aligned}\)
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