Question

Which of the following option(s) is/are Incorrect for electrolysis of aqueous solution of $CuSO_4$ using Cu electrodes

• A. pH of solution increases
• B. pH of solution decreases
• C. $[Cu^{2+}]$ decreases in the solution
• D. $[Cu^{2+}]$ increases in the solution

Answer 1

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

A, B, C, D

Answer 2

During the electrolysis of aqueous $CuSO_4$ using Cu electrodes, $Cu^{2+}$ ions are reduced to Cu metal at the cathode, and the Cu anode oxidizes to $Cu^{2+}$ ions. This process replenishes the $Cu^{2+}$ ions consumed, keeping $[Cu^{2+}]$ constant. Since water is not involved in the electrode reactions, the production or consumption of $H^+$ or $OH^-$ ions does not occur, thus the pH of the solution remains constant. Therefore, statements claiming pH change or $[Cu^{2+}]$ change are incorrect.