Question:
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 a catalyst
Solution:
Option (i) and (ii) are the answers.
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