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BITSAT2024ChemistryClassification of Elements and Periodicity in PropertiesActual

Electron affinity is positive, when

Options

  1. AO changes into O ⁻
  2. BO ⁻ changes to O ²⁻
  3. CO changes into O ⁺
  4. DO changes to O ²⁺

Correct answer

B. O ⁻ changes to O ²⁻

Step-by-step solution

When O ⁻ changes into O ²⁻ , energy is absorbed i.e the change is endothermic because O ⁻ repels the incoming electron due to similar charge. H ice, it needs energy to add (accept) the electron. So, electron affinity ( EA ₂ ) is positive.

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