Question

Iron nails are placed in copper sulphate solution. Write word equations of the reactions involved.

Answer 1

Iron nails lose their shiny appearance because an insoluble layer of copper is formed on the nails, Meanwhile, the solution,$CuS{O}_4$ loses its blue color because of the formation of $FeS{O}_4$. This reaction is called displacement reaction in which the reactive element Iron, Fe has displaced less reactive Copper from its solution, The chemical equation can be written as:
$Fe+CuS{O}_4\to Cu+FeS{O}_4$