The process that is NOT endothermic in nature is :-

Question:

The process that is NOT endothermic in nature is :-

  1. $\mathrm{Ar}_{(g)}+\mathrm{e}^{-} \rightarrow \mathrm{Ar}_{(\xi)}^{-}$

  2. $\mathrm{H}_{(\mathrm{g})}+\mathrm{e}^{-} \rightarrow \mathrm{H}_{(\mathrm{g})}^{-}$

  3. $\mathrm{Na}_{(z)} \rightarrow \mathrm{Na}_{(z)}^{+}+\mathrm{e}$

  4. $\mathrm{O}_{(\mathrm{g})}^{-}+\mathrm{e}^{-} \rightarrow \mathrm{O}_{(\mathrm{g})}^{2-}$


Correct Option: , 2

Solution:

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

rest of all endothermic process.

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