MetallurgyHard

Question

Aluminium is extracted from alumina (Al2 O2) by electrolysis of a molten mixture of

Options

A.Al2O3 + HF + NaAlF4
B.Al2O3 + CaF2 + NaAlF4
C.Al2O3 + Na3 Al F6 + CaF2
D.Al2O3 + KF + Na3 Al F6

Solution

Alumina Al2O3 , is a bad conductor of electricity and has very high melting point, so before subjecting to electrolysis, it is mixed with fluorspar ( CaF2 ) and cryolite ( Na3 Al F6 ), which lower its melting point and make it more conducting.

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