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COMEDK2018ChemistryChemical Bonding and Molecular Structure

Which of the following is diamagnetic?

Options

  1. AH ₂⁺
  2. BO ₂
  3. CLi ₂
  4. DHe ₂⁺

Correct answer

C. Li ₂

Step-by-step solution

H ₂⁺ and He ₂⁺ contains odd number of electrons They are paramagnetic. Among Li ₂ and O ₂ Li ₂(6)= 1 s², 1 s², 2 s² Li have no unpaired electron. It is diamagnetic O ₂(18)= 1 s², 1 s², 2 s², 2 s² 2 p_ x ²= 2 p_ y ² 2 p_ z ², ^ * 2 p_ x ¹= ³ 2 p_ z ¹ It has two unpaired electrons. So, it is paramagnetic.

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