Question: What is the net reaction in Hall-Heroult process?

Options

A : 2Al2O3 + 3C ? 4Al + 3CO2

B : 4Al2O3 + 3C ? 4Al + 6CO2

C : F2 + Al2O3 ? Al + F2O3

D : Na3AlF6 ? AlF3 + 3NaF

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