Chemistryhard · Past Paper
In the extraction of Aluminum, the carbon anode needs to be replaced periodically because:
AIt melts away
BIt reacts with the oxygen evolved
CIt becomes coated with aluminum
DIt loses conductivity
✓ Correct Answer: B — It reacts with the oxygen evolved
Oxygen gas evolved at the anode reacts with the carbon to form CO2, gradually burning away the electrode.
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