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Electron affinity is positive for (a) O(g) + e^- → O^- (g) (b) S(g) + e^- → S^-(g)

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Electron affinity is positive for

(a) O(g) + e- → O- (g)

(b) S(g) + e- → S-(g)

(c) O+(g) + e- → O(g)

(d) O-(g) + e- → O2-(g)

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Correct answer: (d) O-(g) + e- → O2-(g)

Explanation:

O- ion repel the incoming electron thus energy is required to add incoming electron.

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