1.

Answer the following questions with respect to the electrolytic process in the extraction of aluminium : (i) Identify the components of the electrolyte other than pure alumina and the role played by each. (ii) Explain why powdered coke is sprinkled over the electrolytic mixture.

Answer»

(i) The electrolyte is a solution of aluminium oxide (Al2O3) dissolved in cryolite (sodium hexafluoroaluminate (Ill), Na3AlF6). The use of cryolite reduces the melting point of alumina and increases the conductivity of solution. 

(ii) To prevent the heat loss from molten electrolyte.



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