According to Molecular Orbital Theory,

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C22− is expected to be diamagnetic

O22+ is expected to have a longer bond length than O2

N2+ and N2− have the same bond order

He2+has the same energy as two isolated He atoms

answer is A.

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Detailed Solution

a) C22− =14 electronsb) O22+ Band order-3,O2 Band order-2c) N2+ ,N2− have same number of electronsd) He2+ has 0.5 Bond order, which has dissociation energy

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