Chemistry - Metallurgy Question with Solution | TestHub

Galena (PbS) is first concentrated and then partially roasted to PbO + PbS mixture. In self-reduction step, PbO reacts with remaining PbS to form Pb metal, so (A) is correct.
Copper impurities in lead can be removed by liquation process, where low-melting lead is separated from higher-melting impurities, so (B) is correct.
(C) is wrong because cyanide is used in gold/silver leaching, not for galena flotation prevention.
(D) is incorrect in this context as silver removal is not by simple oxidation with O₂ in molten Pb.