A piece of zinc is placed in three different solutions: lead nitrate, aluminium sulphate and silver nitrate. Which solution(s) will zinc be able to displace the metal from its solution?

Zinc will displace the metal from a solution of lead nitrate and silver nitrate. Zinc is more reactive than lead, so it will displace lead from the solution, forming zinc nitrate and lead metal. Aluminium is more reactive than zinc, so aluminium can displace zinc from zinc sulphate solution, forming aluminium sulphate and zinc metal: 2Al + 3ZnSO4 → Al2(SO4)3 + 3Zn.