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Which molecule/ion out of the following ...

Which molecule/ion out of the following does not contain unpaired electrons?

A

`N_(2)^(+)`

B

`O_(2)`

C

`O_(2)^(2-)`

D

`B_(2)`

Text Solution

Verified by Experts

The correct Answer is:
C
`N_(2)^(+)(13)= sigma1 s^(2), sigma^(**) 1s^(2), sigma2s^(2), sigma^(**)2s^(2),pi 2p_(x)^(2) = pi 2p_(y)^(2), sigma2p_(z)^(1)`
`O_(2) (16) = sigma1 s^(2), sigma^(**) 1s^(2),sigma2s^(2), sigma^(**)2s^(2), sigma2p_(z)^(2), pi 2p_(x)^(2) = pi 2p_(y)^(2), pi^(**) 2p_(x)^(1), = pi^(**) 2p_(y)^(1)`
`O_(2)^(2-)(18) = sigma1s^(2), sigma^(**) 1s^(2), sigma2s^(2), sigma^(**) 2s^(2), sigma2p_(z)^(2), pi2p_(x)^(2) = pi 2p_(y)^(2), pi^(**) 2p_(x)^(2), = pi^(**) 2p_(y)^(2)`
`B_(2) (10) = sigma1s^(2), sigma^(**)1s^(2), sigma2s^(2) , sigma^(**)2s^(2), pi2p_(x)^(1) = pi 2p_(y)^(1)`
Thus, `O_(2)^(2-)` does not contain unpaired electrons.
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