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Electrolysis of aqueous HF produces O2 a...

Electrolysis of aqueous `HF` produces `O_2` at anode but not `F_2` Explain.

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In aqueous solution, fluoride `(F^-)` is very stable. Electrolysis of aqueous fluoride liberates oxygen, due to the preferential oxidation of water. 
`2H_2O to 4e^(-) + 4H^(+) + O_2`
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