Aluminium is extracted from alumina (Al_2O_3) | vedclass

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Question

(A) The electrolysis of pure alumina faces some difficulties. Pure alumina is a bad conductor of electricity.The fusion temperature of pure alumina is

Vedclass · Accepted Answer

$Al_2O_3 + Na_3AlF_6 + CaF_2$

Vedclass · Answer

(A) The electrolysis of pure alumina faces some difficulties. Pure alumina is a bad conductor of electricity.The fusion temperature of pure alumina is about $2000^{\circ} C$,and at this temperature,the metal formed vaporizes because the boiling point of aluminum is $1800^{\circ} C$.These difficulties are overcome by using a molten mixture containing alumina $(Al_2O_3)$,cryolite $(Na_3AlF_6)$,and fluorspar $(CaF_2)$.Cryolite lowers the melting point of the mixture and increases its electrical conductivity.Therefore,the correct option is $A$.

Aluminium is extracted from alumina $(Al_2O_3)$ by electrolysis of a molten mixture of:

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