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Q.

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

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a

To acts as a catalyst.

b

To make the fused mixture very conducting.

c

To increase the temperature of the melt.

d

To decrease the rate of oxidation of carbon at anode

answer is B.

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Detailed Solution

CaF2 and Na3AlF6 are added to Al2O3 to increase the conductivity and decrease the melting point
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