QQuestion
The following sketch illustrates the process of conversion of Alumina to Aluminium: [5]
Study the diagram and answer the following:
- Name the constituent of the electrolyte mixture which has a divalent metal in it.
- Name the powdered substance ‘X’ sprinkled on the surface of the electrolyte mixture.
- What is the name of the process?
- Write the reactions taking place at the electrodes ‘Y’ (anode) and ‘Z’ (cathode) respectively.
✓Answer
(a) Fluorspar, CaF2.
(b) Powdered coke.
(c) Hall–Héroult process.
(d) At Y (anode):
2O2− → O2 + 4e−
At Z (cathode):
Al3+ + 3e− → Al
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