Question

Blue solution of copper sulphate changes into green when a piece of iron added to the solution​

Answer 1

Explanation:

when a iron nailed immersed in the solution of copper sulphate than iron displays from the copper solution to the copper sulphate because iron is more reactive than copper therefore copper sulphate solution colour changes from Blue to pale green.

hope it will help u.

Answer 2

Answer:

When a piece of iron is added in the solution of copper sulphate then iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solutions colour changes from blue to pale green

CuSO4 (aq) + Fe (s) → FeSO4 (aq) + Cu (s)