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Q.

Aluminium is extracted from alumina (Al2O3) by electrolysis of a molten mixture of

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a

Al2O3+HF+NaAIF4

b

Al2O3+CaF2+NaAIF4

c

Al2O3+Na3AIF6+CaF2

d

Al2O3+KF+Na3AIF6

answer is C.

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Detailed 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 (Na3AlF6)which lower its melting point and make it more conducting. Mainly CaF2 and Na3AlF6 mixed with Al2O3 for converting in molten state.
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Aluminium is extracted from alumina (Al2O3) by electrolysis of a molten mixture of