The process that is NOT endothermic in nature is :-

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Question:
The process that is NOT endothermic in nature is :-

$\mathrm{Ar}_{(g)}+\mathrm{e}^{-} \rightarrow \mathrm{Ar}_{(\xi)}^{-}$
$\mathrm{H}_{(\mathrm{g})}+\mathrm{e}^{-} \rightarrow \mathrm{H}_{(\mathrm{g})}^{-}$
$\mathrm{Na}_{(z)} \rightarrow \mathrm{Na}_{(z)}^{+}+\mathrm{e}$
$\mathrm{O}_{(\mathrm{g})}^{-}+\mathrm{e}^{-} \rightarrow \mathrm{O}_{(\mathrm{g})}^{2-}$

Correct Option: , 2

Solution:

$\mathrm{H}_{(\mathrm{g})}+\mathrm{e}^{-} \rightarrow \mathrm{H}^{-} \quad$ is exothermic

rest of all endothermic process.