Question

What is the oxidation state of $K$ in $K{O}_2$ ?

• A. $-1$
• B. $-2$
• C. $+1$
• D. $0$

Answer 1

The correct option is C $+1$

It has only one electron in its valence shell and can only take the $+1$ oxidation state. Now, in $K{O}_2$, let oxidation number of oxygen be $x$. Therefore, $1+2x=0$ as $K=+1$ and $K{O}_2$ is neutral molecule.

$K$ shows an oxidation state of $K^{+}$ where as other half forms $O_2^{-}$. It is paramagnetic in nature.