Q.Extraction of gold and silver involves leaching with cyanide ion. Silver is later recovered by (NEET-2017)

Step 1. Section 1.2.3 works through this exact sequence for gold: after cyanide leaching gives the soluble complex [Au(CN)2]-, the metal is recovered by reacting the deoxygenated leached solution with zinc metal -- Zn(s) + 2[Au(CN)2]-(aq) -> [Zn(CN)4]2-(aq) + 2Au(s) -- a process the text names cementation. Silver, leached the same way as [Ag(CN)2]-, is recovered by the identical zinc-displacement (cementation) step. …

Recall the cementation step (zinc added to reduce the leached cyanide complex) worked through explicitly for gold in Section 1.2.3, and recognise silver's cya …

• Confusing the RECOVERY step from a leach solution (displacement/cementation with zinc, a chemical reduction) with the later, separate REFINING methods (distillation, …