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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?
A  decreases by 2, then increases by 2
B  increases by 2, then decreases by 2
C  increases by 2, then decreases by 4
D  no change, then decreases by 2
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