Question

When iron rod is kept in copper sulphate solution brown layer is formed on iron. What changes are observed in colour of solution and state chemical reaction for it

Answer 1

Fe +CuSO4=FeSO4+Cu
here the blue colour of the solution eventually fades and turn into light green due to the formation of ferrous sulphate.
The chemical reaction that takes place is displacement reaction

Answer 2

The blue colour of the solution changes to pale green copper is displaced by iron. Cuso4+ fe-----feso4+ cu the brown deposit is of copper metal