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:

  1. Fluorspar $\left(CaF _2\right)$ improve the electrical conductivity during electrolytic reduction of alumina.


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