question_answer

What is the correct order of spin only magnetic moment (in BM) of \[M{{n}^{2+}},\]\[C{{r}^{2+}}\] and \[V{{r}^{2+}}?\]

A) \[M{{n}^{2+}}>{{V}^{2+}}>C{{r}^{2+}}\]

B) \[{{V}^{2+}}>C{{r}^{2+}}>M{{n}^{2+}}\]

C) \[M{{n}^{2+}}>C{{r}^{2+}}>{{V}^{2+}}\]

D) \[C{{r}^{2+}}>{{V}^{2+}}>M{{n}^{2+}}\]

Correct Answer: C

Solution :

[c] Number of unpaired electrons in various species. Since, \[\mu =\sqrt{n(n+2)}\] i.e., it increases with increase in number of unpaired electrons present in a species. Thus, the correct order is \[M{{n}^{2+}}>C{{r}^{2+}}>{{V}^{2+}}.\]