Question

Why chlorine cannot be obtained by electrolysis of aqueous hf solution though it is a good conductor of electricity?

Answer 1

Chlorine cannot be produced by the electrolysis of a chlorine salt dissolved in water because of the high reactivity of chlorine with the protons of water and the subsequent formation of hydrogen. As in aqueous solution, protons (H+) are preferentially reduced before Cl- ions, leading to hydrogen evolutions, the reduction of Cl- requires to perform the electrolysis in a molten chlorine salt in the absence of water.

I hope that clarifies your query.