Question

Among $K{O}_2,AI{O}_2^{-},Ba{O}_2$ and $N{O}_2^{+}$ unpaired electron is present in

• A.
• B.
• C. only
• D. only

Answer 1

The correct option is C only

$O_2^{-}=\sigma 1s^2\sigma 1s^2\sigma 2s^2\sigma 2s^2\sigma 2P^2\times [\begin{array}{c}\pi 2p^{2}y\pi \\ \pi 2p^{2}z\pi \end{array}[\begin{array}{c}2p^{2}y\\ 2p^{1}z\end{array}$