Given below are two statements: 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:

(A) Both Statement I and Statement II are true

(B) Both Statement I and Statement II are false

(C) Statement I is true but Statement II is false

(D) Statement I is false but Statement II is true

JEE Main · 2026 · 21 Jan 2026 · Shift 2 · Coordination Compounds

Given below are two statements:

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:

(A)Both Statement I and Statement II are true✓ Correct
(B)Both Statement I and Statement II are false
(C)Statement I is true but Statement II is false
(D)Statement I is false but Statement II is true

Answer: (A)

Solution

For

[Cr (H_{2} O)_{6}]^{2 +}

the metal is

d^{4}

in a weak octahedral field, giving

t_{2 g}^{3} e_{g}^{1}

and a crystal field stabilisation energy of

- 0.6 Δ_{o}

, whereas

[Mn (H_{2} O)_{6}]^{2 +}

d^{5}

high spin with

t_{2 g}^{3} e_{g}^{2}

and zero stabilisation energy, so the chromium complex is the more stabilised and the first statement is correct. The ferricyanide ion

[Fe (CN)_{6}]^{3 -}

holds

Fe^{3 +}

as low-spin

d^{5}

with one unpaired electron, while the ferrocyanide ion

[Fe (CN)_{6}]^{4 -}

holds

Fe^{2 +}

as low-spin

d^{6}

with none, so ferricyanide has the greater spin-only moment and the second statement is correct. Both statements are true.

JEE Main · 2026 · 21 Jan 2026 · Shift 2 · Single correct option

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JEE Main · 2026 · 21 Jan 2026 · Shift 2 · Coordination Compounds

Solution

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