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JEE Main 2023 · 29 Jan · Shift 1

JEE Main 2023 Chemistry question on Hydrogen and s-Block Elements

The magnetic behavior of Li2O\text{Li}_2\text{O}, Na2O2\text{Na}_2\text{O}_2 and KO2\text{KO}_2, respectively, are
  1. A.
    diamagnetic, diamagnetic and paramagnetic
  2. B.
    paramagnetic, paramagnetic and diamagnetic
  3. C.
    paramagnetic, diamagnetic and paramagnetic
  4. D.
    diamagnetic, paramagnetic and diamagnetic
Show answer and solution

Correct option: A

Solution

Li₂O contains O²⁻ (oxide ion), which has the electron configuration [He]2s²2p⁶ — all electrons paired, so it is diamagnetic.

Na₂O₂ contains O₂²⁻ (peroxide ion), which has a O–O single bond with all electrons paired (bond order 1, no unpaired electrons), so it is diamagnetic.

KO₂ contains O₂⁻ (superoxide ion), which has bond order 1.5 and one unpaired electron in its π* antibonding orbital, making it paramagnetic.

[JEE Main 2023 · 29 Jan · Shift 1]

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