Question

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

(a) AI(OH)₃ in NaOH solution 

(b) an aqueous solution of AI₂(SO₄)₃

(c) a molten mixture of Al₂O₃ and Na₃AlF₆ 

(d) a molten mixture of AIO(OH)and AI(OH)₃

Answer 1

The correct option (c) a molten mixture of Al₂O₃ and Na₃AlF₆

Explanation:

In it, Na₃AlF₆ provides fwo functions viz., it is used to decrease the melting point of Al₂O₃ and to increase the conductivity.