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The p-Block Elements
Question
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Fluorine can not be prepared from fluorides by chemical treatment. Why?

Answer

The standard reduction potential of fluorine is (2.87) maximum and thus it can be oxidized by any reagent
1 /2 F2 + e→ F –     E° = maximum
Further more, electrolysis can liberate F2, but F2 being very reactive, is again reduced to F– ion the most stable ion.

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