Which of the following are true for electrolytic extraction of alum...

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Which of the following are true for electrolytic extraction of aluminium :
\( \mathrm{P} \)
(A) cathode material contains graphite
W
(B) anode material contains graphite
(C) cathode reacts away forming \( \mathrm{CO}_{2} \)
(D) anode reacts away forming \( \mathrm{CO}_{2} \)
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