Question

1. Which electrolyte is used for the extraction of calcium?
2. Give cathode and anode reaction involved in the above extraction?
3. Also suggest the electrodes used in the extraction of aluminium.

Answer 1

1. Fused calcium chloride (CaCl₂)
2. Cathode: \[\ce{Ca^{2+} + 2e- -> Ca}\]
   Anode: \[\ce{2Cl- -> Cl2 + 2e-}\]
3. In aluminium extraction, the carbon lining of the tank acts as the cathode, and thick carbon (graphite) rods act as the anodes.