Question

The oxidation number of manganese in $Mn{O}_4^{-}$ is

• A. 7

Answer 1

The correct option is A 7
The oxidation number of oxygen is -2. The overall oxidation number of $Mn{O}_4^{-}$ is -1. Let's consider the oxidation state of manganese to be '$x$'. So, the equation will be:
$x$ $+$ 4$\times$ (-2) $=$ $-$1
$⟹$$x$ $=$ $-$1 $+$ 8
$⟹$$x$ $=$ 7
Therefore, the oxidation number for manganese is 7.