The function of adding cryolite in the electrolyte reduction of alumina by Hall-Heroult process is to :

dissolve alumina

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lower melting point of alumina

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lower the fuel bill

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increase the electrical conductivity of alumina

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Solution

The correct options are
B lower melting point of alumina
C lower the fuel bill
D increase the electrical conductivity of alumina
In the electrolyte reduction of alumina by Hall-Heroult process, when cryolite is added, the melting point of alumina is lowered which also lowers the fuel bill. Also the electrical conductivity of alumina lowered.
Hence, options B, C and D are correct.

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

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

(C a F_{2})

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