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Question

Which of the following are added to concentrated alumina during the electrolytic reduction of alumina to aluminium by Hall-Heroult process?


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 option is C cryolite
In Hall-Heroult process, cryolite (Na3AlF6) is added to concentrated alumina inorder to reduce the fusion temperature as well as to improve the conductivity of the melt. Apart from this, fluorspar (CaF2), also called fluorite, is also added to improve the conductivity.

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