Q 2617434389.     The major role of fluorspar `(CaF_2 )` which is added in small amount in the electrolytic reduction of alumina dissolved in fused cryolite `(Na_3AlF_6)` is

JEE 1993
A

as a catalyst

B

to make the fused mixture very conducting

C

to increase the temperature ofthe melt

D

to decrease the rate of oxidation of carbon at the anode

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