Regarding Hall-Heroult process, false statement is
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a
Carbon lining to iron tank is the anode
b
Mixture of Al2O3+CaF2+Na3AlF6 is the electrolyte
c
Anode must be replaced from time to Oxime because it gets oxidized
d
Coke is the reductant
answer is A.
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Detailed Solution
(1) carbon lining to iron tank is the cathode(3) carbon rods act like anode at anode 2O-2 → O2 + 4e- ;C+12O2→CO→O2CO2Carbon anode reacts with oxygen and they decompose. They must be replaced from time to time.