(a) If a steel spoon were to be plated with silver, state what would be suitable for use as the;

(i) anode. (ii) cathode; (iii) electrolyte

 

(b)(i) Write an equation for one of the reactions involved in the purification of bauxite.

(ii) Give the reason why the carbon anodes are changed at intervals during the electrolysis of pure alumina solution in molten cryolite.