Which of the following sequences best describes the 'self-reduction' (auto-reduction) mechanism used — Metallurgy and Isolation of Elements Chemistry Question

💡 Solution & Explanation

In self-reduction, less electropositive metals (Cu, Pb, Hg) have their sulphide ores partially roasted to an oxide. The air supply is then cut off, and the temperature is raised, causing the newly formed oxide to react with the remaining unroasted sulphide to yield the metal and $SO_2$.