In the extraction of aluminium by Hall-Heroult process, purified Al2O3 is mixed with CaF2 to [NCERT Exemplar] (a) lower the melting point of Al2O3. (b) increase the conductivity of molten mixture. (c) reduce Al3+ into Al(s). (d) acts as catalyst.

In the extraction of aluminium by Hall-Heroult process, purified Al2O3

1.	In the extraction of aluminium by Hall-Heroult process, purified Al2O3 is mixed with CaF2 to [NCERT Exemplar] (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» (i) and (III) are the correct options.Explanation:Lower the melting point of Al2O3: increase the conductivity of molten MIXTURE. REDUCE Al3+ (AQ) into Al(s): ACT as catalyst.