The method of electrolytic refining is not suitable in the extraction of : — Metallurgy and Isolation of Elements Chemistry Question

💡 Solution & Explanation

Step 1: Aluminium is highly electropositive and forms an extremely stable oxide (Al2O3) that cannot be reduced by carbon, hydrogen, or other common reducing agents. Step 2: Therefore, its extraction must be carried out by electrolytic reduction of purified alumina dissolved in a molten cryolite bath (the Hall-Heroult process). Step 3: This makes electrolysis the correct method for the reduction, corresponding to option (c).