Chemistry
Explain with reasons:
In the electrolytic reduction of alumina, the graphite anode is gradually consumed.
or
Why the anode has to be replaced from time to time in this process?
Metallurgy
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Answer
In the electrolytic reduction of alumina, the graphite (anode) is oxidized by oxygen to CO and further forms CO2, so it is consumed and has to be replaced from time to time.
Equation:
2C + O2 ⟶ 2CO
2CO + O2 ⟶ 2CO2
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