The difference between spin only magnetic moment values of $\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{2}$ and $\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{3}$ is ______.

JEE Main · 2022 · 26 Jul 2022 · Shift 1 · Coordination Compounds

The difference between spin only magnetic moment values of

[Co (H_{2} O)_{6}] Cl_{2}

and

[Cr (H_{2} O)_{6}] Cl_{3}

is ______.

Answer: 0

Solution

[Co (H X_{2} O) X_{6}] Cl X_{2}

Co X^{2 +}

has electronic configuration

3 d^{7}

. Water is a weak-field ligand, so high-spin: 3 unpaired electrons.

μ = n (n + 2) = 15

BM.

[Cr (H X_{2} O) X_{6}] Cl X_{3}

Cr X^{3 +}

has electronic configuration

3 d^{3}

. All three electrons are unpaired.

μ = 15

BM.

Difference:

15 - 15 = 0

BM.

Answer: 0.

JEE Main · 2022 · 26 Jul 2022 · Shift 1 · Integer answer

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