Question

The sketch illustrates refining of aluminium by Hoope’s process. [reference]
hoopes-process-aluminium-extraction-simplified-chemistry-icse-class-10-1200x650
(i) Which of A and B is the cathode and which one is the anode?
(ii) What is the electrolyte in the tank?
(iii) What material is used for the cathode?

  • Metallurgy
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Answer

(i) A is cathode and B is anode.

(ii) Mixture of cryolite, BaF2, AlF, CaF2 serves as the electrolyte

(iii) Pure molten aluminium with carbon electrodes serves as the cathode.

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Metallurgy

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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