Question

The major role of fluorspar which is added in small quantities in the electrolytic reduction of ${Al_2O_3}$ dissolved in fused cryolite is

• A. to make the fused mixture very conducting
• B. as a catalyst
• C. to lower the fusion temperature of the melt
• D. to decrease the rate of oxidation of carbon at the anode

Answer 1

Answer: (C)

to lower the fusion temperature of the melt

Answer 2

Fluorspar increases the conductivity and lowers the fusion temperature of the melt.