A-LevelChemistryElectrochemistry9701/12 · May/June 2013 · Q11 Mark
During the electrolysis of molten aluminium oxide to produce aluminium, using carbon electrodes, two consecutive reactions occur at the anode, each producing a different gas. How does the oxidation number of oxygen change in these reactions?
Adecreases by 2, then increases by 2
Bincreases by 2, then decreases by 2
Cincreases by 2, then decreases by 4
Dno change, then decreases by 2
✓ Correct answer
B: increases by 2, then decreases by 2
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