Question

Why does the color of copper sulphatevsolution change when iron is dipped in it?

Answer 1

when the iron nail dipped in copper sulphate solution than iron displaced the copper because iron is more reactive metal than the copper. Copper is less reactive metal.

After the reaction
CuSO4 + Fe ---- FeSO4 + Cu

Answer 2

Explanation:

When an iron nail immersed in the solution of copper sulphate than iron displaces copper from the solution of copper sulphate because iron is more reactive than copper. Therefore copper sulphate solution colour changes from blue to pale green.