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Statement-1: The superoxide ion is paramagnetic while the peroxide ion is diamagnetic. Statement-2: The superoxide ion possesses one unpaired electron, whereas the peroxide ion has none. Choose the correct option.

1. Statement-1 is true, Statement-2 is true and Statement-2 is the correct explanation of Statement-1.
2. Statement-1 is true, Statement-2 is true and Statement-2 is NOT the correct explanation of Statement-1.
3. Statement-1 is true, Statement-2 is false.
4. Statement-1 is false, Statement-2 is true.

Correct answer: Statement-1 is true, Statement-2 is true and Statement-2 is the correct explanation of Statement-1.

Solution

O2⁻ has one unpaired electron in pi* (paramagnetic) while O2²- has all pi* orbitals filled and paired (diamagnetic), so Statement-2 correctly explains Statement-1.

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