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BITSAT2013ChemistryChemical Bonding and Molecular StructureActual

Using MOT, which of the following pairs denote paramagnetic species?

Options

  1. AB ₂ and C ₂
  2. BB ₂ and O ₂
  3. CN ₂ and C ₂
  4. DO ₂ and O ₂²⁻

Correct answer

B. B ₂ and O ₂

Step-by-step solution

B ₂ and O ₂ are paramagnetic due to presence of unpaired electron. MO electronic configuration of B ₂ is: 1 s² ^ * 1 s² 2 s² ^ * 2 s² 2 p_ x ¹= 2 p_ y ¹ MO electorn i.e. configuration of O ₂ is: array l 1 s² ^ * 1 s² 2 s² ^ * 2 s² 2 p_ z ² 2 p_ x ² = 2 p_ y ² * 2 p_ x ¹= * 2 p_ y ¹ array

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