Industrial Waste

Evaluate each statement for accuracy.
Statement i: Incorrect. In the Hall-Héroult process, the steel vessel lined with carbon serves as the cathode, not the anode.
Statement ii: Correct. Purified alumina (Al O ) is indeed mixed with cryolite to lower the melting point of alumina and increase the conductivity of the mixture.
Statement iii: Correct. The overall chemical reaction for the Hall-Héroult process involves the reduction of alumina to aluminum and the oxidation of carbon (as anode material) to carbon dioxide.
Conclusion: Statements and are correct, making option (2) the correct choice.