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In electrolysis of Al2O3 by Hall-Heroult process : 

(A) cryolite Na3[AlF6] lowers the melting point of Al2O3 and increases its electrical conductivity. 

(B) Al is obtained at cathode and probably CO2 at anode 

(C) both are correct 

(D) none of the above is correct

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(C) both are correct

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