Question

Which of the following is an example of electrochemical principles of metallurgy?

(a) Baeyer’s process

(b) Solvay process

(c) Bergius process

(d) Hall-Heroult process

The question was posed to me during an interview for a job.

This intriguing question comes from Electrochemical Principles of Metallurgy in portion General Principles and Processes of Isolation of Elements of Chemistry – Class 12

Answer 1

The correct option is (d) Hall-Heroult process

Explanation: Hall-Heroult process is an electrochemical process to reduce bauxite to a nearly pure aluminium. Bauxite is dissolved in a molten electrolyte composed of sodium, fluorine and aluminium and is maintained at a high temperature. In this process aluminium is accumulated at the cathode and oxygen gas at the anode.