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Which of the following species is paramagnetic ?

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Which of the following species is paramagnetic ?

(a) O2-

(b) CN-

(c) CO

(d) NO+

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1 Answer

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Correct option is (a) O2-

O2- (17) - KK σ 2s2 σ* 2s2 σ 2pz2 π 2рx2 = π 2ру2 π* 2рx2 π* 2ру1 

Thus, O2- has one upaired electron; hence paramagnetic. Other species has no unpaired electron.

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