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Which one of the halogen is prepared by only electrolysis method

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Cl₂

Br₂

F₂

I₂

answer is C.

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Detailed Solution

Oxdn.Power of halogens is, F₂ > Cl₂ > Br₂> I₂

No other halogen can oxidize $F^{-}$ to F₂. So it is not possible to prepare F₂ by Oxidation of $F^{-}$ . It is prepared by electrolytic oxidation of ion using fused KHF₂.

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