The major role of flourspar `(CaF_(2))`, which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite `(Na_(3)AlF_(6))`, is

Options

A. to acts as catalyst
B. to make the fused mixture very conducting
C. to increase the temperature of the melt
D. to decrease the rate of oxidation of carbon at the anode.

Answer

B

Explanation

`CaF_2` Ionic compound ionises to give ions & thus increases the number of ion in the electrolyte and as impurity decreases the melting point of `Al_2O_3`