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What is the anode and cathode used in Hall-Heroult process?

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in Chemistry – Class 12 by (188k points)
What is the anode and cathode used in Hall-Heroult process?

(a) Zinc and copper

(b) Iron and copper

(c) Carbon and zinc

(d) Graphite and carbon

The question was posed to me in my homework.

The question is from Electrochemical Principles of Metallurgy in division General Principles and Processes of Isolation of Elements of Chemistry – Class 12

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Correct answer is (d) Graphite and carbon

To explain I would say: In the extraction of aluminium from bauxite the anode and cathode must be inert electrodes like graphite and carbon so that they do not take part in the reaction. At the end of the process the metal is accumulated at cathode and it is easier to collect the aluminium from carbon electrode as it does not react with aluminium.

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