The process that is NOT endothermic in nature is :-

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MCQ

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

A
$Ar _{( g )}+ e ^{-} \rightarrow Ar _{( g )}^{-}$
✓
$H _{( g )}+ e ^{-} \rightarrow H _{( g )}^{-}$
C
$Na _{( g )} \rightarrow Na _{( g )}^{+}+ e ^{-}$
D
$O _{( g )}^{-}+ e ^{-} \rightarrow O _{( g )}^{2-}$

✓

Answer

Correct option: B.

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

b
$H _{( g )}+ e ^{-} \rightarrow H ^{-} \quad$ is exothermic rest of all endothermic process.

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