Which of the following reactions will not occur? Why not?
(a) Zinc Sulphate + Copper ➝ Copper Sulphate + Zinc
(b) Copper Sulphate + Iron ➝ Iron Sulphate + Copper

(a) Zinc sulphate + Copper ➝ Copper Sulphate + Zinc

This reaction will not occur as zinc is more reactive than copper. Copper will not be able to replace zinc from zinc sulphate solution. A more reactive metal can replace a less reactive metal, but a less reactive one cannot replace a more reactive metal.

(b) Copper Sulphate + Iron ➝ Iron Sulphate + Copper

This reaction will take place as Iron is more reactive than copper. In a solution of copper sulphate, iron will react and will be able to displace copper from its solution. In this reaction, iron will change into iron sulphate and copper metal will be produced.