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In the extraction of Aluminium by Hall - Herault process  a) Write the neat labeled diagram of electrolytic cell.

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In the extraction of Aluminium by Hall - Herault process 

a) Write the neat labeled diagram of electrolytic cell.

b) Give the equation of overall cell reaction.

c) What is the role of cryolite?

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a) 

b) 2Al2O3 + 3C → 4Al + 3CO2

c) It lowers the melting point of the electrolyte (mix) and brings conductivity.

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