Question : Electrolysis of an aqueous solution of copper sulphate using copper electrodes gives
Option 1: copper at the cathode, and oxygen at the anode
Option 2: copper at the anode, and oxygen at the cathode
Option 3: copper at the cathode, and anodes dissolve to give copper
Option 4: hydrogen at the cathode, and oxygen at the anode
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Correct Answer: copper at the cathode, and oxygen at the anode
Solution : The correct option is copper at the cathode and oxygen at the anode .
Copper is deposited at the cathode and is dissolved at the anode. Consequently, the concentration of copper ions in the 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 and evolved at the anode.
The equation will be as follows:
(cathode)
Cu
+
+ 2e
−
→ Cu
(anode)
Cu → Cu2
+
+ 2e
−
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