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Q.

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

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a

Al2O3+CaF2+NaAlF4

b

Al2O3+KF+Na3AlF6

c

Al2O3+Na3AlF6+CaF2

d

Al2O3+HF+NaAlF4

answer is C.

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Detailed Solution

Fused alumina (Al2O3) is a bad conductor of electricity. Therefore, cryolite (Na3AlF6) and fluorspar (CaF2) are added to purified alumina which not only make alumina a good conductor of electricity but also reduce the melting point of the mixture to around 1140 K.

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