Q. 16

In the extraction of aluminium by Hall-Heroult process, purified Al2O3 is mixed with CaF2 to
A. lower the melting point of Al2O3.

B. increase the conductivity of molten mixture.

C. reduce Al3+ into Al(s).

D. acts as catalyst.

Answer :

Al2O3 is a bad conductor of electricity and have very high meting point.


Thus, CaF2 and Na3AlF6 are used in Hall-Heroult’s process to extract Al from Al2O3. They lower the melting point of Al2O3 and increase the conductivity of the molten mixture.

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