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