1.

In the extraction of aluminium by electrolysis? i) Give the composition of electrolyte used ii) Overall cell reaction iii) Role of cryolite

Answer»

Removes silica impurity as slg calcium silicate. 

Cryolite increases conductivity and reduces melting point of Al2O3

Aluminium Extraction 

Cathode: Al3+(melt) + 3e + al(l) 

Anode: C(s) + O2-(melt) CO(g) + 2e 

C(s) + 2O2-(melt) CO2(g) + 2e 

Overall reaction: 2Al2O3 + 3C → 4Al + 3CO2



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