When an iron rod is dipped into a solution of copper sulphate, copper is displaced. Why is it so?
When iron is dipped in copper sulphate (CuSO4) a displacement reaction takes place. As iron (Fe) is more reactive than copper (Cu), it displaces copper from the copper sulphate (CuSO4) solution, thus, forming ferrous sulphate (FeSO4) and leaving behind copper (Cu).
The color of the solution will turn green because of the formation of FeSO4.