Question -
In the commercial electrochemical process for Aluminium extraction, the electrolyte used is:
Options:
A .  Al(OH)3 in NaOH
B .  An aqueous solution of Al2(SO4)3
C .  A molten mixture of Al2O3 & Na3AlF6
D .  A molten mixture of Al2O3 & Al(OH)3
Answer: Option C : C In the electrolytic extraction of Aluminium, purified alumina is mixed with Na3AlF6 and CaF2. Cryolite (Na3AlF6) helps dissolve Alumina and lowers the melting point of this mix to about 1050 ∘C. Pure Alumina melts at about 2100 ∘C. CaF2 is added to enhance the conductivity. As shown in the above image, the surface on the inside of the steel case is coated with a graphite lining, which acts as the cathode. The electrolyte is a molten mixture of cryolite, molten Alumina and CaF2.
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