First slide

13th group or boron group

Question

Electrolytic reduction of Alumina to Aluminium by Hall-Heroult process is carried out _____?

Moderate

A

In presence of $N a C l$
B

In presence of $C a F_{2}$
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.

Solution

The purpose of adding cryolite is to lower the melting point and also to increase conductivity as it furnishes more no. ions.

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