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Question

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


A

in the presence of NaCl

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B

in the presence of fluorite

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C

in the presence of cryolite which forms a melt with a lower melting temperature

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D

in the presence of cryolite which forms a melt with a higher melting temperature

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Solution

The correct option is C

in the presence of cryolite which forms a melt with a lower melting temperature


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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