Exams › JEE Advanced › Chemistry

Identify the INCORRECT statement from the following regarding oxygen and its species:

1. Both O3 and O2²- (peroxide ion) are diamagnetic
2. Among O2, O2⁺, and O2⁺, the shortest O-O bond length is found in O2⁺
3. Among O2, O2⁺, and O2⁻, only O2 is paramagnetic
4. Among O2, O2⁺, and O2⁻, the maximum spin magnetic moment belongs to O2

Correct answer: Among O2, O2⁺, and O2⁻, only O2 is paramagnetic

Solution

MO theory for O2 gives 2 unpaired electrons in pi* orbitals => paramagnetic. Removing one electron (O2⁺) leaves 1 unpaired electron => still paramagnetic. Adding one electron (O2⁻) fills one pi* to give 1 unpaired electron => still paramagnetic. So the claim that 'only O2 is paramagnetic' is false; O2⁺ and O2⁻ are also paramagnetic. Hence statement C is incorrect.

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