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Question

In the extraction of aluminium by Hall-Heroult process, purified Al2O3 is mixed with CaF2 to:

A
Lower the melting point of Al2O3 mixture
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B
Increase the conductivity of molten mixture
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C
Reduce Al3+ into Al(s)
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D
Acts as catalyst
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Solution

The correct option is B Increase the conductivity of molten mixture
In the extraction of aluminium by Hall Heroult process, Al2O3 is mixed with CaF2 or Na3AlF6 as it lowers the melting point of the mixture and increases the conductivity of the electrolyte. Al3+ is reduced at the cathode to form Al
Therefore, the correct options are A and B.

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