Fewpal
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The major role of fluorspar (CaF2) which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite (Na3AlF6) is : 

(A) As a catalyst 

(B) To make the fused mixture very conducting 

(C) To lower the temperature of the melt 

(D) To decrease the rate of oxidation of carbon at anode

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Best answer

Correct option is (BC)

(B) To make the fused mixture very conducting 

(C) To lower the temperature of the melt

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