Coordination Compounds - Result Question 37
####39. The calculated spin only magnetic moment of $Cr^{2+}$ ion is
[2020]
(a) $4.90 BM$
(b) $5.92 BM$
(c) $2.84 BM$
(d) $3.87 BM$
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Solution:
- (a) Electronic configuration of $Cr^{2+}-[Ar] 3 d^{4}$
$ \begin{aligned} & \begin{array}{|l|l|l|l|l} \hline 1 & 1 & 1 & 1 & \\ n \end{matrix} \\ & \mu_n=\sqrt{n(n+2)} \\ & \therefore \mu_n=\sqrt{4(4+2)}=\sqrt{24} BM=4.9 BM \end{aligned} $
