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.


NCERT Class XII
Chemistry - Exemplar Problems

Chapter 6. General Principles and Processes of Isolation of Elements

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2015-06-26T15:58:02+05:30

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(i) and (iii) are the correct options.
1 5 1
2015-06-26T20:42:35+05:30
The correct option is: (i) and (iii)
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