Which one of the following is used in the ext | vedclass

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(A) In the metallurgy of aluminium,purified $Al_2O_3$ (alumina) is used as the electrolyte source.It is mixed with $Na_3AlF_6$ (cryolite) or $CaF_2$ (

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$Al_2O_3$

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(A) In the metallurgy of aluminium,purified $Al_2O_3$ (alumina) is used as the electrolyte source.It is mixed with $Na_3AlF_6$ (cryolite) or $CaF_2$ (fluorspar),which lowers the melting point of the mixture and increases its electrical conductivity.This electrolytic process is known as the $Hall-Heroult$ process.The overall reaction is: $2 Al_2O_3 + 3 C \rightarrow 4 Al + 3 CO_2$.

Which one of the following is used in the extraction of aluminium by the electrolytic process?

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