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  4. Electron affinity is positive, when

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Q. Electron affinity is positive, when

AIIMSAIIMS 2013

Solution:

When $O ^{-}$, changes into $O ^{2-}$, change is endothermic because $O ^{-}$repels the incoming electron due to similar charge, hence it needs energy to accept the electron. So, electron affinity is positive.