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Which of the following is paramagnetic?...

Which of the following is paramagnetic?

A

`O_(2)^(-)`

B

`CN^(-)`

C

`CO`

D

`NO^(+)`

Text Solution

Verified by Experts

The correct Answer is:
A
`O_(2)^(-)(17)-KKsigma2s^(2)sigma**2s^(2)sigma2p_(z)^(2)pip_(x)^(2)=pi2p_(y)^(2)pi**2p_(x)^(2)pi**2p_(y)^(1)`
Thus, `O_(2)^(-)` has one unpaired electron, hence paramagnetic. Other species has no unpaired electron.
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