The electrolysis of pure alumina is not feasible because : — Metallurgy and Isolation of Elements Chemistry Question

💡 Solution & Explanation

Step 1: Haematite (Fe2O3) is a dense oxide ore of iron, while its associated silicate gangue impurities are significantly lighter. Step 2: Gravity separation (also called hydraulic washing) separates lighter gangue from heavier metal oxide particles by utilizing a stream of running water. Step 3: Therefore, the gravity separation method is used to concentrate haematite, matching option (a).