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The gaseous process which involves the absorption of energy is

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F → F^-

Cl → Cl^-

O- → O^2-

H → H^-

answer is C.

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Detailed Solution

(1) , (2) and (4) ….. EGE…..exothermic ;

$(3) O (g) \overset{- 141 kJ}{\to} O^{-} (g) \overset{+ 744 kJ}{\to} O^{2 -} (g);$

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