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Regarding Hall-Heroult process, false statement is

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Anode must be replaced from time to Oxime because it gets oxidized

Mixture of Al₂O₃+CaF₂+Na₃AlF₆ is the electrolyte

Coke is the reductant

Carbon lining to iron tank is the anode

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^- ;

$C + \frac{1}{2} O_{2} \to CO \overset{O_{2}}{\to} {CO}_{2}$

Carbon anode reacts with oxygen and they decompose. They must be replaced from time to time.

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