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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.

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(i), (ii)

(i) lower the melting point of Al2O3.

(ii) increase the conductivity of molten mixture.

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