Which of the following metals is commercially extracted utilizing the Self-Reduction (Auto-Reduction — Metallurgy and Isolation of Elements Chemistry Question

💡 Solution & Explanation

Auto-reduction is used for less electropositive metals that form unstable sulphides, such as Copper, Lead, and Mercury. The sulphide ore is partially roasted to an oxide, the air is cut off, and the oxide reacts with the remaining sulphide to yield the pure metal and $SO_2$ gas.