Aluminium is obtained by:

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(B) Aluminium is obtained by the Hall-$H$éroult process,which involves the electrolysis of alumina $(Al_2O_3)$ dissolved in molten cryolite $(Na_3AlF_

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Electrolysing $Al_2O_3$ dissolved in $Na_3AlF_6$

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(B) Aluminium is obtained by the Hall-$H$éroult process,which involves the electrolysis of alumina $(Al_2O_3)$ dissolved in molten cryolite $(Na_3AlF_6)$.The cryolite lowers the melting point of the mixture and increases its electrical conductivity.The overall reaction is:$2Al_2O_3 + 3C \rightarrow 4Al + 3CO_2$At the cathode:$Al^{3+} + 3e^- \rightarrow Al$At the anode:$C(s) + O^{2-} \rightarrow CO + 2e^-$$C(s) + 2O^{2-} \rightarrow CO_2 + 4e^-$

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