The process(es) requiring the absorption of energy is/are :

C l \to C l^{-}

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S \to S^{2 -}

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A r \to A r^{-}

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both (B) and (C)

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Solution

The correct option is C both (B) and (C)
The process of converting an atom to an ion that has $- 2$ charge energy is consumed. Also energy is consumed to add electron to noble gases
$∴ S \to S^{- 2}$ and $A r \to {A r}^{-}$ are process requiring absorption of energy.

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