1.

Aluminium is extracted from alumina (Al_(2)O_(3)) by electrolysis of a molten mixture of :

Answer»

`Al_(2)O_(3)+HF+NaAlF_(4)`
`Al_(2)O_(3)+CaF_(2)+NaAlF_(4)`
`Al_(2)O_(3)+Na_(3)AlF_(6)+CaF_(2)`
`Al_(2)O_(3)+KF+Na_(2)AlF_(6)`

Solution :Fused Alumina `(Al_(2)O_(3))` is a bad conductor of electricity. THEREFORE, cryoliter `(Na_(2)AlG_(6))` and fluospar`)(CaF_(2)`) areadded 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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