Among `KO_(2) , AlO_(2)^(+) , BaO_(2)` and `NO_(2)^(+)` unpaired electron is present in

Options

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

Explanation

In `KO_(2),O_(2)^(Θ)` (superoxide ion) has one unpaired `e^(-)`
In `BaO_(2),O_(2)^(2-)`(peroxide ion) has paired `e^(-')s`
In `AIO_(2)^(Θ),[A1^(+3) O_(2)^(2-)]^(Θ),O_(2)^(2-)` (peroxide ion) has paired`e^(-')s`
As for `O_(2)` there are two such unpaired `e^(-')s` .