When an iron nail is dipped in a solution of copper sulphate, the iron nail becomes brownish in colour and the blue colour of copper sulphate solution fades after some time. The reaction is an example of chemical

When an iron nail is dipped into a copper sulfate solution, a chemical reaction occurs where iron (Fe) reacts with copper(II) sulfate (CuSO4) to form iron(II) sulfate (FeSO4) and copper metal (Cu). This is a classic example of a single displacement reaction because iron, being more reactive than copper on the reactivity series, displaces the copper ions from the solution. The observation of the blue solution fading to a pale green color indicates the formation of iron sulfate, while the brownish coating on the nail is the displaced copper metal depositing on its surface. In this process, iron is oxidized as it loses electrons to become Fe2+ ions, and copper ions are reduced to solid copper, making it also a redox reaction.