A) \[Cl\to C{{l}^{-}}\]
B) \[H\to {{H}^{-}}\]
C) \[{{O}^{-}}\to {{O}^{2-}}\]
D) \[F\to {{F}^{-}}\]
Correct Answer: C
Solution :
Second electron affinity of oxygen is endothermic and greater than first electron affinity, which is exothermic.
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