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JEE Main 202522 JanuaryMorning Shift
Exam
JEE Main
Year
2025
Date
22 January
Shift
Morning Shift
Subject
Chemistry
Chapter
Coordination Compounds

JEE Main 2025 · 22 January · Morning Shift · Chemistry · Coordination Compounds

In which of the following complexes the CFSE, Δ_ o will be equal to...

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

Options

  1. A[Fe(en)3]Cl3\left[\mathrm{Fe}(\mathrm{en})_3\right] \mathrm{Cl}_3
  2. BK4[Fe(CN)6]\mathrm{K}_4\left[\mathrm{Fe}(\mathrm{CN})_6\right]
  3. C[Fe(NH3)6]Br2\left[\mathrm{Fe}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Br}_2
  4. DK3[Fe(SCN)6]\mathrm{K}_3\left[\mathrm{Fe}(\mathrm{SCN})_6\right]

Correct answer

D. K3[Fe(SCN)6]\mathrm{K}_3\left[\mathrm{Fe}(\mathrm{SCN})_6\right]

Step-by-step solution

For complex K3\mathrm{K}_3\left[\mathrm{Fe}(\mathrm{SCN})_6\right]<imgsrc="https://cdn−question−pool.getmarks.app/pyq/jeemain/IYqk−srJyAvqX6zjlepI1CYBtAq03AwqqJRPfSc8Jo0.original.fullsize.png"><br>CalculationofCFSE<img src="https://cdn-question-pool.Quantrex.app/pyq/jee_main/IYqk-srJyAvqX6zjlepI1CYBtAq03AwqqJRPfSc8Jo0.original.fullsize.png"><br> Calculation of CFSE=(−0.4×3+0.6×2)Δ0=0Δ0\begin{aligned} & =(-0.4 \times 3+0.6 \times 2) \Delta_0 \\ & =0 \Delta_0 \end{aligned}$
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