Chemistry - Metallurgy Question with Solution | TestHub

Roasting is the heating of sulfide ores in excess air below their melting point. It removes water of hydration (if present) and converts sulfide ores such as sphalerite (ZnS) into ZnO. During roasting, impurities like arsenic and sulfur are oxidized to their volatile oxides (As₂O₃ and SO₂) and escape. Melting of the ore is not the purpose of roasting; melting occurs during smelting. Therefore, the correct statements are A, C, and D.