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04/01/2022 2:17 pm
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The role of fluorspar (CaF2) which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite (Na3AlF6) is
(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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04/01/2022 2:18 pm
Correct answer: (b) to make the fused mixture very conducting
Explanation:
CaF2 when added to fused cryolite, lowers the m.p. and increases the conductivity.