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In the extraction of aluminium by Hall-Heroult process, purified Al2O3 is mixed

with CaF2 to
(i) lower the melting point of Al2O3.
(ii) increase the conductivity of molten mixture.
(iii) reduce Al3+ into Al(s).
(iv) acts as catalyst.

Chemistry - Exemplar Problems

Chapter 6. General Principles and Processes of Isolation of Elements



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(i) and (iii) are the correct options.
1 5 1
The correct option is: (i) and (iii)
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