Question

The spin-only magnetic moment value of the ion among $\text{Ti}^{2+}, \text{V}^{2+}, \text{Co}^{3+}, \text{and} \, \text{Cr}^{2+}$, that acts as a strong oxidizing agent in aqueous solution is:$\dots$ BM (Nearest integer).
Given atomic numbers: Ti: 22, V: 23, Cr: 24, Co: 27

Answer 1

The strong oxidising agent is Co$^3{+}$.
The number of unpaired electrons in Co$^3{+}$ ($[3d^6]$) is 4.
The spin-only magnetic moment is given by: $\mu = \sqrt{n(n+2)} \, \text{BM}$
Substituting $n = 4$:
$\mu = \sqrt{4(4+2)} = \sqrt{24} \approx 5 \, \text{BM}$