The major role of fluorspar (CaF 2 ), which is added in small quantities in the…
Chemistry · JEE Advanced · NTA Exams — General Principles and Processes of Isolation of Elements
The major role of fluorspar (CaF2), which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite (Na3AlF6), is
- as a catalyst
- to make the fused mixture very conducting
- to lower the temperature of the melt
- to decrease the rate of oxidation of carbon at the anode.
Answer
(C) to lower the temperature of the melt
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