Extraction of Metals - Result Question 36
####36. The major role of fluorspar $\left(CaF _2\right)$ which is added in small amount in the electrolytic reduction of alumina dissolved in fused cryolite $\left(Na _3 AlF _6\right)$ is
(1993, 1M)
(a) as a 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
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Solution:
- Fluorspar $\left(CaF _2\right)$ improve the electrical conductivity during electrolytic reduction of alumina.
