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The process requiring absorption of ener...

The process requiring absorption of energy is
(1) `F to F^(-)` (2) `Cl to Cl^(-)`
`O to O^(2-)` (4) `H to H^(-)`

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Verified by Experts

The correct Answer is:
3
`O to O^(-)" (is exothermic) but "O^(-) to O^(2-)" (is endothermic) and overall " O to O^(2-)" (is endothermic)"`
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