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The process that is NOT endothermic in nature is
\( \mathrm{P} \)
[JEE Main-2020 (September)]
WV
(1) \( \operatorname{Ar}(\mathrm{g})+\mathrm{e}^{-} \rightarrow \operatorname{Ar}^{-}(\mathrm{g}) \)
(2) \( \mathrm{H}(\mathrm{g})+\mathrm{e}^{-} \rightarrow \mathrm{H}^{-}(\mathrm{g}) \)
(3) \( \mathrm{Na}(\mathrm{g}) \rightarrow \mathrm{Na}^{+}(\mathrm{g})+\mathrm{e}^{-} \)
(4) \( \mathrm{O}^{-}(\mathrm{g})+\mathrm{e}^{-} \rightarrow \mathrm{O}^{2-}(\mathrm{g}) \)
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