Question

During the purification of $Cu$ by electrolysis:

• A. The anode used is made of impure copper
• B. Pure $Cu$ is deposited on the cathode
• C. The impurities such as $Ag$ and $Au$ present in solution as ions
• D. The concentration of $CuS{O}_4$ solution remains constant during dissolution of $Cu$

Answer 1

Answer: (A), (B), (D)

The concentration of $CuS{O}_4$ solution remains constant during dissolution of $Cu$

Silver and other impurities deposit as anode mud and do not go into solution.
Since the copper ions formed directly migrate to the cathode, the concentration of copper sulphate remains constant throughout the process.