State the observations at the anode and at the cathode during the elec

1.	State the observations at the anode and at the cathode during the electrolysis of: (i) fused lead bromide using graphite electrodes. (ii) copper sulphate solution using, copper electrodes.
Answer» (i) At anode, the Br^- ion gives up electrons. Red brown bromine gas bubbles can be seen. At cathode, the Pb²⁺ ion accepts electrons. The electrolysis of lead bromide using graphite electrodes produces lead metal at the cathode and bromine gas at the anode. (ii) At the cathode, Cu²⁺ ions are discharged and deposited on the cathode. At the anode, however, copper ions go into solution in preference to the discharge of either OH^- or SO₄^2- ions. As the electrolysis continues, the cathode increases in thickness while the anode slowly dissolves away.

State the observations at the anode and at the cathode during the electrolysis of: (i) fused lead bromide using graphite electrodes. (ii) copper sulphate solution using, copper electrodes.

Answer»

(i) At anode, the Br^- ion gives up electrons. Red brown bromine gas bubbles can be seen. At cathode, the Pb²⁺ ion accepts electrons. The electrolysis of lead bromide using graphite electrodes produces lead metal at the cathode and bromine gas at the anode.

(ii) At the cathode, Cu²⁺ ions are discharged and deposited on the cathode. At the anode, however, copper ions go into solution in preference to the discharge of either OH^- or SO₄^2- ions. As the electrolysis continues, the cathode increases in thickness while the anode slowly dissolves away.

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