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Electrolysis of an aqueous solution of copper sulphate using copper electrodes gives
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- Copper at cathode and oxygen at anode.
- Copper at anode and oxygen at cathode.
- Copper at cathode and anodes dissolve to give copper.
- Hydrogen at cathode and oxygen at anode.
- Copper at cathode and oxygen at anode.
Correct Option: A
Copper is deposited at the cathode and is dissolved at the anode. Consequently the concentration of copper ions in solution remains constant. This can be used as a method of purification of copper as only pure copper is deposited at the cathode. Bubbles of gas (oxygen) are formed at the anode. Cathode reaction: Cu2+ + (aq) + 2e– ® Cu(s); and Anode reaction: 2H2O(l ) ® O2(g) + 4H+(aq) + 4e
