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

$(a)\;\text{$Al(OH)_3$in$NaOH$solution } \\(b)\;\text{An aqueous solution of$Al_2(SO)_3.$} \\(c)\;\text{ A molten mixture of$Al_2O_3$and$Na_3AlF_6$} \\ (d)\;\text{A molten mixture of$Al_2O_3$and$Al(OH)_3$}$

In the commercial electrochemical process for aluminium extraction the electrolyte used is a molten mixture of $Al_2O_3$ and $Na_3AlF_6$
Hence c is the correct answer.