Consider the following six elements found as impurities in various ores: Sulphur, Arsenic, Antimony, — Metallurgy and Isolation of Elements Chemistry Question

💡 Solution & Explanation

During roasting, S, As, Sb, and P form volatile oxides ($SO_2$, $As_2O_3$, $Sb_2O_3$, $P_4O_{10}$) and escape with the exhaust gases. Silicon forms non-volatile $SiO_2$ (removed later as slag), and Iron forms non-volatile $FeO/Fe_2O_3$. Thus, 4 elements from the list are removed as volatile oxides.