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A dioxygen species shows a magnetic moment of 1.73 B.M. The species could be:
- O2- or O2+
- O2 or O2+
- O2 or O2-
- O2, O2- or O2+
Correct answer: O2- or O2+
Solution
mu = 1.73 B.M means one unpaired electron. O2 has 2 unpaired electrons, but O2+ (remove one pi* electron) and O2- (one pi* orbital becomes singly filled after pairing) each have exactly one unpaired electron.
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