The electrochemical extraction of aluminum from bauxite ore involves
Select ALL correct options:
A
the reaction of $\mathrm{Al}_2 \mathrm{O}_3$ with coke $(\mathrm{C})$ at a temperature $>2500^{\circ} \mathrm{C}$.
B
the neutralization of aluminate solution by passing $\mathrm{CO}_2$ gas to precipitate hydrated alumina $\left(\mathrm{Al}_2 \mathrm{O}_3 \cdot 3 \mathrm{H}_2 \mathrm{O}\right)$.
C
the dissolution of $\mathrm{Al}_2 \mathrm{O}_3$ in hot aqueous NaOH .
D
the electrolysis of $\mathrm{Al}_2 \mathrm{O}_3$ mixed with $\mathrm{Na}_3 \mathrm{AlF}_6$ to give Al and $\mathrm{CO}_2$.
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