1.

Cryolite (Na_(3)AlF_(6)) and fluorspar (CaF_(2)) are added to the electrolytic mixture containing pure alumina.

Answer»

Solution :(1) Alumina has very high melting point `(lt 2000^(@)C)`. Cryolite `(Na_(3)AIF_(6))` and fluorspar `(CaF_(2))` LOWER the FUSION temperature of the mixture containing alumina from `2000^(@)C" to "1000^(@)C`, thereby saving electrical energy.
(2) They increase the conductivity and the mobility of the fused mixture. Hence, cryolite and fluorspar are added to the electrolytic mixture containing PURE alumina.


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