When zinc is added to an iron sulphate solution, the colour of the iron sulphate solution changes because displacement of iron from iron sulphate occurs.
So, Zn displaces iron from its iron sulphate solution, resulting in a grey iron precipitate and a colourless zinc sulphate solution.
Zn + FeSO4 → ZnSO4 + Fe
Final Answer:
Zn + FeSO4 → ZnSO4 + Fe
On addition of zinc, colour of iron solution changes and grey iron precipitate is formed along with colourless zinc solution.