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Question

The role of fluorspar, which is added in small quantities in the electrolysis reduction of alumina dissolved in fused cryolite, is:

A
as a catalyst
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B
to make fused mixture conducting
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C
to lower the melting temperature of the mixture
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D
to decrease the rate of oxidation of carbon at anode
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Solution

The correct options are
A to make fused mixture conducting
C to lower the melting temperature of the mixture
The role of fluorspar CaF2, which is added in small quantities in the electrolytic reduction of alumina (Al2O3) dissolved in fused cryolite Na3AlF6, is to make the fused mixture a good conductor of electricity and to lower the melting temperature of the mixture to around 1140 K.

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