Incorrect match is : — Metallurgy and Isolation of Elements Chemistry Question

💡 Solution & Explanation

Step 1: Analyze each entry: Poling is used for the reduction of cuprous oxide (Cu2O) in copper refining. Chromite ore is fused with NaOH/Na2CO3 in the presence of air to form sodium chromate. Silver is extracted by the Mac-Arthur Forrest cyanide process. Step 2: Baeyer's process is used for the concentration of bauxite ore (purification of alumina), whereas the purification (refining) of Aluminium metal itself is done by Hoopes' electrolytic process. Step 3: Therefore, 'Purification of Al metal : Baeyer's method' is an incorrect match. The correct option is (a).