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Which of the following is paramagnetic ? (a) O-2 (b) CN- (c) CO (d) NO+

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Which of the following is paramagnetic ?

(a) O-2

(b) CN-

(c) CO

(d) NO+

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1 Answer

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Best answer

Correct option  (a) O-2

Explanation:

CN- , CO and NO+ are isoelectronic with 14 electrons each and there is no unpaired electrons in the MO configuration of these species. So these are diamagnetic. O-2 is paramagnetic due to the presence of one unpaired electron.

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