Solution:
Iron nails dipped in copper sulphate produce a brown layer of copper that gets deposited.When an iron nail is dipped in a copper sulphate solution, a layer of copper gets deposited over the iron nail. It is a chemical change. It is an irreversible process. Colour of the copper changes from blue to green. The copper that gets deposited on the iron nail is brown. Iron () reacts with copper sulphate () produces copper () and iron sulphate (). It is a displacement reaction, the iron gets displaced less reactive copper.
Reaction:
