WAEC Chemistry 2022 Paper

Concept:A more reactive metal can displace a less reactive metal from a solution of its ions.Explanation:Copper ions, such as $\mathrm{Cu^{2+}}$ in solution, can be displaced only by a metal placed above copper in the reactivity series.Lead ($\mathrm{Pb}$) is more reactive than copper.Silver, gold, and mercury are all less reactive than copper.So lead displaces copper from a copper ion solution:$$\mathrm{Pb + Cu^{2+} \rightarrow Pb^{2+} + Cu}$$Answer:C. lead