(B) Fluorspar $(CaF_2)$ is added in small quantities during the electrolytic reduction of alumina $(Al_2O_3)$ dissolved in fused cryolite $(Na_3AlF_6)

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

To lower the temperature of the melt and to make the fused mixture very conducting

(B) Fluorspar $(CaF_2)$ is added in small quantities during the electrolytic reduction of alumina $(Al_2O_3)$ dissolved in fused cryolite $(Na_3AlF_6)$. Its primary functions are to lower the melting point of the mixture and to increase the electrical conductivity of the melt,which facilitates the electrolysis process at a lower temperature of approximately $1140 \, K$.

Class 12 Chemistry General Principles and Processes of Isolation of Elements Reduction to free Metal

Medium

The function of fluorspar in the electrolytic reduction of alumina dissolved in fused cryolite $(Na_3AlF_6)$ is

IIT 1993 All IIT

A
As a catalyst
B
To lower the temperature of the melt and to make the fused mixture very conducting
C
To decrease the rate of oxidation of carbon at the anode
D
None of the above