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In which of the following ionisation processes the bond energy increases and the magnetic behaviour changes from paramagnetic to diamagnetic?

1. N2 → N2+
2. C2 → C2+
3. O2 → O2+
4. NO → NO+

Correct answer: O2 → O2+

Solution

When O2 is ionized to O2+, one unpaired electron is removed, making the molecule diamagnetic. Additionally, the bond order increases, leading to higher bond energy.

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