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BITSAT 2024
Exam
BITSAT
Year
2024
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

BITSAT 2024 · Chemistry · Classification of Elements and Periodicity in Properties

Electron affinity is positive, when

Electron affinity is positive, when

Options

  1. AO changes into O−\mathrm{O}^{-}
  2. BO−\mathrm{O}^{-} changes to O2−\mathrm{O}^{2-}
  3. CO changes into O+\mathrm{O}^{+}
  4. DO changes to O2+\mathrm{O}^{2+}

Correct answer

B. O−\mathrm{O}^{-} changes to O2−\mathrm{O}^{2-}

Step-by-step solution

When O−\mathrm{O}^{-}changes into O2−\mathrm{O}^{2-}, energy is absorbed i.e the change is endothermic because O−\mathrm{O}^{-}repels the incoming electron due to similar charge. H ice, it needs energy to add (accept) the electron. So, electron affinity (EA2)\left(\mathrm{EA}_2\right) is positive.
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