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 :

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cryolite and fluorspar

cryolite and alum

alum and fluorspar

fluorspar and bauxite

answer is A.

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Detailed Solution

Two auxiliary electrolytes, X and Y, are added to the alumina during an electrolytic reduction to improve electrical conductivity and reduce melt temperature, resulting in a fused mixture that is highly conducting. Cryolite and fluorspar are X and Y.

Two electrolytes ${CaF}_{2}$ and cryolite is introduced to the electrolytic reduction of alumina.

Fluorspar's function is to lower the melting point of mixtures and increase melt electrical conductivity as compared to molten ${Al}_{2} O_{3}$ .

A melt is formed by cryolite, ${Na}_{3} {AIF}_{6}$ , with a lower melting temperature.

Hence Correct option is A

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