During electrolytic reduction of alumina, two auxiliary electrolytes X and Y are added to increase the electrical conductance and lower the temperature of melt in order to make fused mixture very conducting. X and Y are :

cryolite and flourspar

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cryolite and alum

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alum and flourspar

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flourspar and bauxite

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Solution

The correct option is A cryolite and flourspar
During electrolytic reduction of alumina, two electrolytes $C a F_{2}$ and cryolite are added.
Function of fluorspar: It reduces the melting point of mixture and improves the electrical conductivity of the melt as compared to molten $A l_{2} O_{3}$ .
Cryolite, $N a_{3} A I F_{6}$ forms a melt with lower melting temperature.
Option A is correct.

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Similar questions

The role of fluorspar $(C a F_{2})$ which is added in small quantities in the electrolytic reduction of alumina dissolved in fused cryolite $(N a_{3} A l F_{6})$ is:

Q. The major role of fluorspar

(C a F_{2})

which is added in small quantity in the electrolytic reduction of alumina dissolved in fused cryolite

(N a_{3} A l F_{6})

is :
I. to act as a catalyst
II. to make the fused mixture very conduction
III. to lower the temperature of melting
IV. to decrease the rate of oxidation of carbon at the anode

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