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

I, II

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II, III

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I, II, III

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III, IV

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Solution

The correct option is B II, III
Fluorspar $(C a F_{2})$ is added in small quantity in the electrolytic reduction of alumina dissolved in fused cryolite $(N a_{3} A l F_{6})$ . Addition of cryolite and fluorspar increases the electrical conductivity of alumina and lowers the fusion temperature to around 1140 K.

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The correct option is B II, IIIFluorspar (CaF2) is added in small quantity in the electrolytic reduction of alumina dissolved in fused cryolite (Na3AlF6). Addition of cryolite and fluorspar increases the electrical conductivity of alumina and lowers the fusion temperature to around 1140 K.