Q.

In the electrolysis of alumina, cryolite is added to:

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a

lower the melting point of alumina

b

increase the electrical conductivity

c

both (a) and (b)

d

remove impurities from alumina

answer is C.

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Detailed Solution

Cryolite Na2AlF6 is added to Al2O3 before electrolysis to lower the fusion temperature of bauxite in order to dissolve it and to make it a good conductor of current.
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In the electrolysis of alumina, cryolite is added to: