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During the extraction of aluminium by Hall - Heroult process, the electrolytic mixture contains Al2O3+CaF2+Na3AlF6. The purpose of adding CaF2 and Na3AlF6 to Al2O3 is to

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a

Increase melting point, decrease conductivity

b

Decrease melting point, decrease conductivity

c

Decrease melting point, increase conductivity

d

Increase melting point, increase conductivity

answer is C.

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Detailed Solution

Addition of  CaF2 and Na3AlF6 to Al2O3 lowers the melting point and increases conductivity; Electrolysis can be carried out at lower temperature with better electrolytic conductors.
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During the extraction of aluminium by Hall - Heroult process, the electrolytic mixture contains Al2O3+CaF2+Na3AlF6. The purpose of adding CaF2 and Na3AlF6 to Al2O3 is to