Hello there,

Here is your Answer,

When an iron nail is dipped in the copper sulphate solution , the displacement reaction takes place and the iron displace the copper from the solution of  copper sulphate  because iron  is more reactive than copper . Due to this the color of copper sulphate solution change from blue to pale green.

Reaction for the solution is :-

CuSO4 (aq) +Fe (s) ----> FeSO4 (aq) +Cu (s)

Here Cu2+ is acts as an oxidizing agent  whereas, Fe acts as reducing agent.

Hope this Information will help .

Thank you:)

Hello aspirant,

The reason behind change of colour by immersing iron nail in Copper Sulphate Solution:

When an iron nail is dipped in the solution of copper sulphate solution then colour changes from blue to pale green because iron displaces copper from copper sulphate solution because iron is more reactive than copper. The iron nail becomes brownish in colour.

I hope this information was helpful to you.

Best of Luck!!