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N2 and O2 are converted into monoanions, N2− and O2− respectively. Which of the following statements is wrong?

1. In N2− the N—N bond weakens
2. In O2− the O—O bond order increases
3. In O2− bond length decreases
4. N2− becomes diamagnetic

Correct answer: In O2− the O—O bond order increases

Solution

In O2−, the addition of an electron decreases the bond order, as it occupies an antibonding molecular orbital. This leads to a weaker bond and an increase in bond length, not a decrease.

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