Question

Iron filings were added to solution of copper sulphate. after 10 minutes, it was observed that the blue colour of the solution changed and layer got d

Answer 1

Hey there!

When Copper sulphate and iron nail are put together then the reactions occurs is: 

Fe(s) + CuSO₄ (aq) → FeSO₄(aq) + Cu (s)

As we know the colour copper sulphate solution is blue in colour. When we put iron nail in it , copper forms brown coloured coating on iron nail. The solution's colour also changes to light green colour. 

Hence, it is a displacement reaction as iron is more reactive than copper and copper is displaced to form ferrous sulphate solution.

Hope It Helps YoU!

Answer 2

It is due to displacement reaction.Iron being more reactive than copper displaces copper and get mixed with sulpahte solution.
Eqn-CuSO4 =+ Fe= FeSO4 + Cu