'Spin only' magnetic moment is same for which of the following ions? A. $\mathrm{Ti}^{3+}$ B.…
'Spin only' magnetic moment is same for which of the following ions?
A. $\mathrm{Ti}^{3+}$
B. $\mathrm{Cr}^{2+}$
C. $\mathrm{Mn}^{2+}$
D. $\mathrm{Fe}^{2+}$
E. $\mathrm{Sc}^{3+}$
Choose the most appropriate answer from the options given below.
A and E only
B and C only
A and D only
B and D only
Solution
\begin{array}{lcc} Ions & No. of unpaired electrons & Configuration \\\mathrm{Ti}^{3+} & 1 & 3 d^1 \\\mathrm{Cr}^{2+} & 4 & 3 d^4 \\\mathrm{Mn}^{2+} & 5 & 3 d^5 \\\mathrm{Fe}^{2+} & 4 & 3 d^6 \\\mathrm{Sc}^{3+} & 0 & 3 d^0\end{array}
Spin only magnetic moment is given by $\sqrt{n(n+2)} \mathrm{BM}$
$\therefore \mathrm{Cr}^{2+}$ and $\mathrm{Fe}^{2+}$ will have same spin only magnetic moment.