1.

Extraction of aluminumcan beunderstoodby The purpose of adding cryolite is :

Answer»

to increase the ELECTRICAL CONDUCTIVITY of pure aluminium
to higher the MELTING point of `Al_(2)O_(3)`
to remove the impurities as slag
to increase he AI % in the yield

Solution :`Na_(3) AIF_(6)` lowers the m.pt. and INCREASES the conductance of melt.
Hence, (A) is the correct answer.


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