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During change of O2 to O2− ion, the electron adds on which one of the following orbitals?

1. π* orbital
2. π orbital
3. σ* orbital
4. σ orbital

Correct answer: π* orbital

Solution

When O2 gains an electron to form O2−, the added electron occupies the π* orbital, which is the lowest-energy antibonding molecular orbital available in the molecular orbital diagram of O2.

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