During the electrolytic reduction of alumina, | vedclass

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(A) In the Hall-Heroult process for the electrolytic reduction of alumina $(Al_2O_3)$,the melting point of pure alumina is very high $(2323 \ K)$.To l

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Cryolite and fluorspar

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(A) In the Hall-Heroult process for the electrolytic reduction of alumina $(Al_2O_3)$,the melting point of pure alumina is very high $(2323 \ K)$.To lower the melting point to about $1140 \ K$ and to increase the electrical conductivity of the melt,two auxiliary electrolytes are added: Cryolite $(Na_3AlF_6)$ and Fluorspar $(CaF_2)$.Thus,$X$ and $Y$ are cryolite and fluorspar.

During the electrolytic reduction of alumina,two auxiliary electrolytes $X$ and $Y$ are added to increase the electrical conductance and lower the melting point of the mixture. $X$ and $Y$ are:

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