6(iii)
The following sketch illustrates the process of conversion of Alumina to Aluminum. Study the diagram and answer the following:
(a) Name the constituent of the electrolyte mixture which has a divalent metal in it.
(b) Write the reactions taking place at the electrodes:
(c) Give one use of sprinkling coke on the electrolyte.
- (a)Y (anode) and
- (b)Z (cathode) respectively.
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(a) Fluorspar (calcium fluoride, CaF2) — it contains the divalent metal calcium.
(b)
- Y (anode): 2O2- - 4e- ⟶ O2
- Z (cathode): Al3+ + 3e- ⟶ Al
(c) The powdered coke sprinkled over the electrolyte prevents the carbon anodes from burning in air.