Impure aluminium is purified by : — Metallurgy and Isolation of Elements Chemistry Question

💡 Solution & Explanation

Step 1: Alumina extraction from bauxite is carried out using Baeyer's, Hall's, or Serpeck's chemical processes. Step 2: Once crude aluminium metal is obtained, it must be refined/purified to achieve high purity (up to 99.99%). Step 3: This refining of impure aluminium is commercially performed using Hoopes' electrolytic process (Hoop's process), where three liquid layers of different densities are electrolyzed. Thus, option (c) is correct.