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Q.

In the electrolysis of alumina to obtain aluminium metal, cryolite is added mainly to

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a

remove the impurities of alumina

b

lower the melting point of alumina

c

increase the electrical conductivity

d

dissolve alumina in molten cryolite

answer is A.

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Detailed Solution

Fused alumina (Al2O3) is a bad conductor of electricity. Therefore, cryolite (Na3AIF6) 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 1140K.

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