The pairs of species of oxygen and their magnetic behaviour are noted below. Which of the following presents the correct description ?

Options

A. `O_(2)^(-), O_(2)^(2)` - Bone diamagnetic
B. `O^(+) , O_(2)^(2)` - Both paramagnetic
C. `O_(2)^(+), O_(2)` - Both paramagnetic
D. `O, O_(2)^(2-)` - Both paramagnetic

Answer

C

Explanation

`O_(2)` has two unpaired electrons in `pi_(2p_(x)) and pi_(2p_(y)) `,
i.e.,` pi_(2p_(x))^(**1)pi_(2p_(x))^(**2)`
`O_(2)^(-)` will have one upaired electron , `O_(2)^(2-)` will
have no unpaired electron, `O_(2)^(+)` will have one
unprired electron, `""_(8) O = 1s^(2) 2s^(2) 2p_(x)^(2) 2p_(y)^(1) 2p_(z)^(1)`
and thus has two unpaired electrons , `O^(+)` will have
one unpaired electron .
Thus , `O_(2)^(+) and O_(2)` contain unpaired electrons and
hence will be both paramagnetic .