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Comparing the peroxide ion (O2²-) with the dioxygen molecule (O2), which statement is INCORRECT?

1. O2²- has bond order 1 whereas O2 has bond order 2
2. The bond in O2²- is weaker than the bond in O2
3. Both O2²- and O2 are paramagnetic
4. The bond length in O2²- is longer than in O2

Correct answer: Both O2²- and O2 are paramagnetic

Solution

O2²- has all electrons paired (diamagnetic) while O2 has two unpaired electrons (paramagnetic), so the statement that both are paramagnetic is wrong.

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