Question

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

Solution

Correct option is

In the presence of cryolite which forms a melt with lower melting point

In the extraction of Al, Al2O3 is melted with cryolite [Na3(AlF6)]. Cryolite improves the electrical conductivity of the alumina and lowers the m.p. of the mixture to about 950oC.

SIMILAR QUESTIONS

Q1

Froth floatation process for the concentration of the ores is an illustration of the practical application of

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Q10

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