Among `KO_(2), KAlO_(2), CaO_(2) and NO_(2)^(+)`, unpaired electrons is present in :

Options

A. `NO_(2)^(o+)` and `BaO_(2)`
B. `KO_(2)` and `AIO_(2)^(Theta)`
C. `KO_(2)` only
D. `BaO_(2)` only

Answer

C

Explanation

`KO_(2)` contains superoxide ion `O_(2)^(Theta)` and superoxide ions have three `e^(-)` bond. Thus it has one unpaired `e^(-)`
.