Copper (II) tetraoxosulphate (VI) solution is electrolyzed using carbon electrodes. Which of the following are produced at the anode and cathode respectivel...

Assessment: JAMB UTME - Chemistry - 1992 Subject: Chemistry

Question 1 Report

Copper (II) tetraoxosulphate (VI) solution is electrolyzed using carbon electrodes. Which of the following are produced at the anode and cathode respectively ?

Answer Details
During electrolysis, oxidation occurs at the anode while reduction occurs at the cathode. In this case, copper (II) tetraoxosulphate (VI) is being electrolyzed, so the copper ion (Cu2+) and the sulfate ion (SO42-) are present in the solution. At the anode, oxidation occurs, and the sulfate ion (SO42-) is likely to be oxidized to oxygen gas (O2) and water (H2O) since carbon is a good oxidizing agent. Thus, option B (oxygen and copper) is correct. At the cathode, reduction occurs, and copper (II) ions (Cu2+) are likely to be reduced to copper metal (Cu) since copper is more likely to be reduced than hydrogen. Therefore, option B (oxygen and copper) is the correct answer.

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