1.

Which is not paramagnetic of the following?

Answer»

`N_(2)^(+)`
`CO`
`O_(2)^(-)`
`NO`

Solution :MO ELECTRONIC configuration of CO is
`(sigma_(1S))^(2)(sigma_(1s)^(**))^(2)(sigma_(2s))^(2)(sigma_(2p_(z)))^(2)(sigma_(2s)^(**))^(2)(pi_(2p_(x)))^(2)(pi_(2p_(y)))^(2)`


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