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Question
Give reason for the following:
Potassium is not extracted by electrolysis of its aqueous salt solution.
Solution
Electrolysis removes reactive metals from aqueous salt solutions. This is because the aqueous solution will contain both H+ and metal ions. When an electric current flows, the H+ ion is discharged first, followed by the metal. Thus, the cathode produces hydrogen gas rather than metal, and potassium does not accumulate at the cathode.
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