What changes in the colour of iron nails and coppper sulphate solution do you observe after keeping the iron nails in copper sulphate solution for about half an hour?

After keeping iron nails in a copper sulfate solution for about half an hour, you will observe that the color of the iron nails changes to a reddish-brown due to the deposition of copper on the surface of the nails. The blue color of the copper sulfate solution will fade as copper is transferred from the solution to the nails.