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  4. In the electrolysis of alumina, cryolite is added to

Q. In the electrolysis of alumina, cryolite is added to

 2094  219 IIT JEEIIT JEE 1986General Principles and Processes of Isolation of Elements Report Error

Solution:

Alumina has very high melting point and it is poor conductor of electricity. Both these factors posses difficulty in electrolysis of molten alumina.
Cryolite. , when mixed with alumina, lowers melting point as well as improve electrical conductivity, hence helps in electrolysis of .