Question

When an iron nail is left in copper sulphate solution what colour change is observed ​

Answer 1

Answer:

Iron displaces copper to form iron sulphate which is green in colour

Answer 2

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.