In the commercial electrochemical process for aluminium extraction, the electrolyte used is

Options

A. `Al(OH)_(3)` in NaOH solution
B. An aqueous solution of `Al_(2)(SO_(4))_(3)`
C. A molten mixture of `Al_(2)O_(3)` and `Na_(3)AlF_(6)`
D. A molten mixture of AlO(OH) and `Al(OH)_(3)`

Answer

C

Explanation

`Al_(2)O_(3)` is electrolyte, while `Na_(3)AlF_(6)` is used to decreases the mp of `Al_2O_(3)` and to increases the conductivity.