Assertion: Superoxide ion is paramagnetic whereas peroxide ion is diamagnetic.
Reason: Superoxide ion `[O=O]^(-)` has one unpaired electron whereas peroxide ion `[O=O]^(-)` has no unpaired electron.

Options

A. If both asseration and reson are true and the reason is the correct explanation of the asseration.
B. If both asseration and reason are true ans the reason is the correct explanation of the asseration.
C. If asseration is true but reason is false.
D. If asseration is false but reason is true.

Answer

A

Explanation

`[O=O]^(-)` has `MO` configuration
`sigma1s^(2)sigma**,sigma2s^(2)**2s^(2),sigma2p^(2)pi2p_(x)^(2)pi2p_(y)^(2)pi**2p_(y)^(2)pi**2p_(x)^(2)pi**2p_(y)^(1)`
`[O=O]^(2-)` has `MO` configuration
`sigma1s^(2)**1s^(2),sigma2s^(2)sigma**2s^(2),sigma2p^(2)pi2p_(x)^(2)pi2p_(y)^(2)pi**2p_(x)^(2)pi**2p_(y)^(2)`