A) \[C{{r}^{2+}}\]
B) \[M{{n}^{2+}}\]
C) \[C{{u}^{2+}}\]
D) \[C{{o}^{2+}}\]
E) \[N{{i}^{2+}}\]
Correct Answer: B
Solution :
Highest magnetic moment depends upon number of unpaired electron since \[C{{r}^{2+}}=3{{d}^{4}}4{{s}^{0}}\], \[M{{n}^{2+}}=3{{d}^{5}}4{{s}^{0}}\] \[C{{u}^{2+}}=3{{d}^{9}}4{{s}^{0}}\], \[C{{o}^{2+}}=3{{d}^{7}}4{{s}^{0}}\], \[N{{i}^{2+}}=3{{d}^{6}}4{{s}^{0}}\] So \[M{{n}^{2+}}\] contain maximum number of unpaired electron i.e. 5.
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