JEE Main Chemistry question

Chemistry General Principles and Processes of Isolation of Elements (Metallurgy)JEE Main

Not in JEE Main or NEET syllabus

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

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

Answer: (B)

Solution

Fluorspar () added in small quantity to the cryolite melt further lowers the operating temperature of the electrolytic bath and improves its electrical conductivity,

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Question ID VK-138335