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Nomenclature of Coordination Compounds

The spin-only...

Question

The spin-only magnetic moment of $C r^{3 +} (E C [A r] 3 d^{3})$ in strong $O_{h}$ magnetic field is equal to :

A

\sqrt{3} B . M .

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B

\sqrt{8} B . M .

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C

\sqrt{15} B . M .

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D

Zero

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Solution

The correct option is D $\sqrt{15} B . M .$
$C r^{3 +} = 3 d^{3}$ (Valance shell)
$n = 3$ (unpaired electrons)
$μ_{s} = \sqrt{15} B M$

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Q. Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code :

	Column I		Column II
a.	$C o^{3 +}$	i.	$\sqrt{8} B . M .$
b.	$C r^{3 +}$	ii.	$\sqrt{35} B . M .$
c.	$F e^{3 +}$	iii.	$\sqrt{3} B . M .$
d.	$N i^{2 +}$	iv.	$\sqrt{24} B . M .$
		v.	$\sqrt{15} B . M .$

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