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.