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a
C22− is expected to be diamagnetic
b
O22+ is expected to have a longer bond length than O2
c
N2+ and N2− have the same bond order
d
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