Question

Which of the following is an electrolyte used during the electrolytic refining of copper?

• A. Copper sulphate solution
• B. Copper sulphate solution acidified with sulphuric acid
• C. Sulphuric acid
• D. Copper chloride

Answer 1

The correct option is B Copper sulphate solution acidified with sulphuric acid

In the electrolytic refining of copper, impure copper is made the anode, a thin sheet of pure copper is made the cathode and a solution of copper sulphate acidified by sulphuric acid is used as the electrolyte.
Anode:
$Cu\to C{u}^{2+}+2e^{-}$
Cathode:
$C{u}^{2+}+2e^{-}\to Cu$