Question

what happens when iron nail dipped in two test tube containing copper sulphate and ferrous sulphate solution

Answer 1

Fe+CuSO4 gives FeSO4 +Cu. (displacement reaction)

Answer 2

Thanks for your question !

Simple, the displacement reaction will take place if the above elements are combined.

Iron nail means Fe. Copper Sulphate means CuSO4. Ferrous sulphate means FeSO4.

The reaction would be -
Fe + CuSO4 -> FeSO4 +Cu.