A) lower the melting point of alumina
B) dissolve alumina in molten cryolite
C) remove the impurities of alumina
D) increase the electrical conductivity
Correct Answer: A
Solution :
[a] Fused alumina \[(A{{l}_{2}}{{O}_{3}})\] is a bad conductor of electricity. Therefore, cryolite \[(N{{a}_{3}}Al{{F}_{6}})\] and fluorspar \[(Ca{{F}_{2}})\] 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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