The reaction between copper sulphate solution and an iron nail is an example of ________ reaction.

• When an iron nail is placed in copper sulfate solution iron displaces copper to form ferrous sulfate and copper metal.
• We can observe the formation of copper precipitates red in color and the color of the solution changes to a green color.
• The reaction can be written as-
• $\underset{\mathrm{Iron}}{\mathrm{Fe}\left(\mathrm{s}\right)}+\underset{\mathrm{Copper}\mathrm{sulphate}}{\mathrm{CuSO}4\left(\mathrm{aq}\right)}\to \underset{\mathrm{Ferrous}\mathrm{sulphate}}{\mathrm{FeSO}4\left(\mathrm{aq}\right)}+\underset{\mathrm{Copper}}{\mathrm{Cu}\left(\mathrm{s}\right)}$
• It is an example of a displacement reaction.
• Displacement reaction- A displacement reaction is the one wherein the atom or a set of atoms is displaced by another atom in a molecule.

Hence, The reaction between copper sulfate solution and an iron nail is an example of a displacement reaction.