Question

The correct statement(s) about $C{r}^{2+}$ and $M{n}^{3+}$ is (are) -
[Atomic numbers of $Cr=24$ and $Mn=25$]

• A. $C{r}^{2+}$ is a reducing agent
• B. $M{n}^{3+}$ is an oxidizing agent
• C. Both $C{r}^{2+}$ and $M{n}^{3+}$ exhibit $d^4$ electronic configuration
• D. When $C{r}^{2+}$ is used as a reducing agent, the chromium ion attains $d^5$ electronic configuration

Answer 1

Answer: (A), (B), (C)

$C{r}^{+2}\to C{r}^{+3}$
$d^4{d}^3$ (stable)
So, act as a reducing agent
$M{n}^{+3}\to M{n}^{+2}$
$d^4{d}^5$ (stable)
So, act as a oxidising agent