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The peroxide ion has a bond order of 1 while the oxygen molecule has a bond order of 2.

The peroxide ion has a weaker bond than the dioxygen molecule has.

The peroxide ion as well as the dioxygen molecules are paramagnetic

The bond length of the peroxide ion is greater than that of the dioxygen molecule.

answer is A.

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Detailed Solution

1) Peroxide ion O22−↓B.O.=1 Oxygen O2↓B.O.=22) B.O. ∝1 B.L. ⇒Peroxide has weaker bond compound to O23) O22−(18e¯)O2(18e¯) diamagnetic ↓ Paramagnetic 4) Correct.

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