Alkali metals have one electron in the outermost shell and hence during reactions they readily give the valence electron and get themselves oxidised. Hence, they are good reducing agents.
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Give reasons for the following pertaining to Hall Herault’s process. (i) The fusion temperature of the electrolyte has to be lowered before conducting the electrolytic reduction. (ii) The constituents of the electrolyte in addition to one part of fused alumina contains three parts of cryolite and one part of fluorspar. (iii) A layer of powdered coke sprinkled over the electrolytic mixture, protects the carbon electrodes. (iv) It is preferred to use a number of graphite electrodes as anode, instead of a single graphite electrode.
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