First slide

13th group or boron group

Question

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

Moderate

A

In the presence of NaCl
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

Solution

Cryolite increases the conductivity and decreasing the melting point

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