In the extraction of aluminium by Hall-Heroult process, purified AI2O3 is mixed with CaF2 to
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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 is A.
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Detailed Solution
In the metallurgy of aluminium Al2O3 is mixed with Na3AlF6 or CaF2 which causes following affects:(i) Lower the melting Point of Al2O3(ii)Increase the conductivity of molten mixture