Poling is an established pyrometallurgical refining technique utilized for specific molten metals. W — Metallurgy and Isolation of Elements Chemistry Question

💡 Solution & Explanation

Poling is used to purify metals having their own oxides as impurities (e.g., $Cu_2O$ in Cu, $SnO_2$ in Sn). Green wood logs are used because the high temperature forces them to release hydrocarbon gases (like methane). These hydrocarbons act as reducing agents (not oxidizing agents) to convert the metal oxide back to pure metal.