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_(3)AlF_(6)`

Solution :Fused alumina `(Al_(2)O_(3))` is a bad conductor of electrieity. Therefore,cryolite `(Na_(3)AlF_(6))` and fluorspar `(CaF_(2))` are added to purified alumina which not only MAKE alumina a good conductor of electriety but also REDUCE the melting point of the mixture to around 1140 K.


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