Medium
Aluminium is extracted from alumina $(Al_2O_3)$ by electrolysis of a molten mixture of
- A$Al_2O_3 + HF + NaAlF_4$
- B$Al_2O_3 + CaF_2 + NaAlF_4$
- C$Al_2O_3 + Na_3AlF_6 + CaF_2$
- D$Al_2O_3 + KF + Na_3AlF_6$
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