Q38. How can an electrochemical cell be converted into an electrolytic cell?\\
(1) Applying an external opposite potential lower than $\mathrm { E } ^ { 0 }$ cell.\\
(2) Reversing the flow of ions in salt bridge.\\
(3) Applying an external opposite potential greater than $\mathrm { E } ^ { 0 }$ cell-\\
(4) Exchanging the electrodes at anode and cathode.