Medium
In the $Hall-Heroult$ process,a mixture of $......$ is used as an electrolyte.
- A$Na[Al(OH)_4] + CaF_2$
- B$Al_2O_3 + Na[Al(OH)_4]$
- CMolten $Al_2O_3 + Na_3AlF_6$
- D$Na_3AlF_6 + Na[Al(OH)_4]$
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