Question

Oxidation number of oxygen in superoxide ion, $O_2^{-}$ is :

• A. $-2$
• B. $-\frac{1}{2}$
• C. $-\frac{3}{2}$
• D. none of these

Answer 1

The correct option is B $-\frac{1}{2}$

Given superoxide ion, $O_2^{-}$.
If oxidation number if oxygen $=x$
then, $2x=-1$
$\therefore x=-\frac{1}{2}$