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Question

The role of fluorspar (CaF2) which is added during the electrolytic reduction of alumina dissolved in fused cryolite is:

A
to act as a catalyst
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B
to make the fused mixture very conducting
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C
to increase the temperature of the melt
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D
to decrease the rate of oxidation of carbon at the anode
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Solution

The correct option is B to make the fused mixture very conducting
The role of fluorspar is to reduce the melting point of mixture and improve the electrical conductivity of the melt as compared to molten Al2O3. Hence, option B is the correct answer.

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