Question

blue solution of copper sulphate changes to green when a piece of iron is added to this solution​

Answer 1

Answer:

this happens because of displacement reaction

Explanation:

iron is more reactive than copper so,iron displaces or takes the position of copper in the solution

Answer 2

Answer:

hope this will help u

Explanation:

when an iron nail is dipped in a copper sulphate solution, iron displaces copper from its solution to form iron sulphate, which is green in color. Hence, the blue color of copper sulphate solution changes into green color because of this displacement reaction.