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During the extraction of aluminium by Hall-Heroult process, purified \mathrm{Al_{2}O_{3}} is mixed with \mathrm{CaF_{2}} to:

A. Lower the melting point of \mathrm{Al_{2}O_{3}} mixture

B. Increase the conductivity of molten mixture

C. Reduce \mathrm{Al^{3+}} into Al (s) 

D. Acts as catalyst

Option: 1

A only


Option: 2

B and C only


Option: 3

D only


Option: 4

A and B only


Answers (1)

During the extraction of aluminium by Hall Heroult process, \mathrm{Al_{2}O_{3}} is mixed with \mathrm{CaF_{2}} or \mathrm{Na_{3}AlF_{6}} as it lowers the melting point of the mixture and increases the conductivity of the electrolyte. \mathrm{Al^{3+}} is reduced at the cathode to form Al.

Posted by

Sumit Saini

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