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The number of anti-bonding electron pairs in O2−2 molecular ion on the basis of molecular orbital theory is (Atomic number of O is 8):

1. 0
2. 2
3. 3
4. 4

Correct answer: 4

Solution

In O2−2, the total number of electrons is 18. According to molecular orbital theory, the anti-bonding orbitals (π*2px, π*2py, and σ*2pz) are occupied by 4 electrons, which correspond to 2 pairs.

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