Given below are two statements : one is labelled as Statement I and the other is labelled as Statement II : Statement I: Crystal Field Stabilization Energy (CFSE) of [ Cr ( H 2 O ) 6 ] 2+ is greater than that of [ Mn ( H 2 O ) 6 ] 2+ . Statement II: Potassium ferricyanide has a greater spin-only magnetic moment than sodium Ferrocyanide. In the light of the above statements, choose the correct answer from the options given below:

Statement I is false but Statement II is true

Both Statement I and Statement II are true

Both Statement I and Statement II are false

Statement I is true but Statement II is false

Chemistry · Coordination Compounds

JEE Main 2026 — 21 January, Evening Shift — Question 57

Given below are two statements : one is labelled as Statement I and the other is labelled as Statement II :

Statement I: Crystal Field Stabilization Energy (CFSE) of $\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$ is greater than that of $\left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$ .

Statement II: Potassium ferricyanide has a greater spin-only magnetic moment than sodium Ferrocyanide.

In the light of the above statements, choose the correct answer from the options given below:

Option A:
Both Statement I and Statement II are true
Option B:
Both Statement I and Statement II are false
Option C:
Statement I is true but Statement II is false
Option D:
Statement I is false but Statement II is true
Correct

Answer: D

Step-by-step solution

$\left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \Rightarrow$ CFSE value is zero because of $\mathrm{d}^{5}$ configuraiton with WFL in coordination number 6 $\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$ . $\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+} \Rightarrow$ CFSE value is $-0.6 \Delta_{0}$ because of $\mathrm{d}^{4}$ configuraiton with WFL in coordination number 6.

For : $\mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right], \mu=\sqrt{1(1+2)}=\sqrt{3}$ B.M. For : $\mathrm{Na}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right], \mu=\sqrt{0}$ B.M.

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Exam: JEE Main 2026
Paper: 21 January, Evening Shift
Subject: Chemistry
Chapter: Coordination Compounds
Topic: Properties and importance of Coordination Complexes

Identify the metal ions among Co^2+, Ni^2+, Fe^2+, V^3+ and Ti^2+ having a spin-only magnetic moment value more than 3.0 BM . The sum of…

Answer: D

Step-by-step solution

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