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Q. Magnetic moment (in $BM$ ) of $Cu ^{2+}$ ion is

Solution:

$Cu ^{2+} \rightarrow 3 d^{9}$
It has one unpaired electron
Hence $\mu=\sqrt{n(n+2)}$ B.M
$\mu=\sqrt{3} \,\,B \cdot M=1.732$ B.M