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Electrolytic reduction of alumina to alu...

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

A

in the presence of NaCI

B

in the presence of fluorite

C

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

D

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

Text Solution

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The correct Answer is:
C
Cryolite improves the electrical conductivity of the cell as `Al_2O_3` is a poor conductor. Cryolite serves as an added impurity and lowers the melting point of the mixture to about `950^@ C`.
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