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1. Identify the correct statement with reference to the extractive metallurgy of aluminium.
(A): Anode effect sets in when the cryolite concentration goes below 40%.
(B): Approximately 80% of the aluminium deposited on the cathode comes from cryolite.
(C): Sodium is deposited along with aluminium, but is immediately vaporised.
(D): The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3.
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