Question

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

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

Answer 1

Answer: (C)

Both $Cr^{2+}$ and $Mn^{3+}$ exhibit $d^4$ electronic configuration

Answer 2

$Cr^{+2} ? Cr^{+3}$
$d^{4}\quad\quad d^{3}$ (stable)
So, act as a reducing agent
$Mn^{+3 }? Mn^{+2}$
$d^{4}\quad\quad d^{5}$ (stable)
So, act as a oxidising agent