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Question

Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out:


A
sodium chloride
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B
fluorite
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C
cryolite
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D
calcium carbonate
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Solution

The correct options are
B fluorite
C cryolite

Cryolite is added to concentrated alumina so that the fusion temperature is lowered. Also, cryolite - Na3AlF6 - improves the conductivity of the melt.
Fluorspar - CaF2 (also called fluorite) is added to improve the conductivity.


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