Exothermic process among the following is

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${Xe}_{(g)} + e^{-} \to {Xe}^{-}_{(g)}$

${Cl}_{(g)} + e^{-} \to {Cl}^{-} (g)$

${Na}_{(g)} \to N {a^{+}}_{(g)} + e^{-}$

$O_{(g)}^{-} + e^{-} \to {O^{- 2}}_{(g)}$

answer is B.

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Detailed Solution

(1) ….. Xe has positive electro gain enthalpy due to octet configuration.
(3)…… IP of any element is endothermic
(4) ….. 2nd electron affinity is always endothermic
(2) is correct

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