Which of the following ions has the maximum magnetic moment ?

(a) Mn^{2+} (b) Fe^{2+} (c) Ti^{2+} (d) Cr^{2+}

Correct option is ** (a) Mn ^{2+} **

**Explaination :::**

number of unpaired electrons in Mn^{2+} =5

number of unpaired electrons in Fe^{2+} =4

number of unpaired electrons in Ti^{2+} =2

number of unpaired electrons in Cr^{2+} =4

Magnetic moment =\(\sqrt{n(n+2)} B.M.\) … Here "n" is the number of unpaired electrons .

The maximum number of unpaired electrons are in Mn^{2+} that is 5 therefore maximum magnetic moment is of Mn^{2+ }ion

Hence , (a) Mn^{2+} is correct