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The pairs of species of oxygen and their magnetic behaviours are noted below. Which of the following presents the correct description?

1. O2, O2+ – Both diamagnetic
2. O2+, O2− – Both paramagnetic
3. O2, O2− – Both paramagnetic
4. O2+, O2− – Both paramagnetic

Correct answer: O2, O2− – Both paramagnetic

Solution

O2 is paramagnetic due to the presence of unpaired electrons in its molecular orbital configuration. O2− is also paramagnetic as it gains an electron, which still leaves unpaired electrons in the antibonding orbitals.

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