Question

The spin-only magnetic moment value of $M^{3+}$ ion (in gaseous state) from the pairs $C{r}^{3+}/C{r}^{2+},M{n}^{3+}/M{n}^2,F{e}^{3+}/F{e}^{2+}$ and $C{o}^{3+}/C{o}^{2+}$ that has negative standard electrode potential, is B.M.
[Nearest integer]

Answer 1

Answer: 4

${E_{C{r}^{+3}}^0|}_{C{r}^{+2}}=-0.41V$
$\left[C{r}^{+3}\right]=4s^{0}3d^3$
$\mu =\sqrt{n(n+2)}\text{ B.M }$
$=\sqrt{15}\text{ B.M }\sim 4\text{ B.M }$