Question

what will be two observation made by students when ieon filling is added to copper sulphate solution

Answer 1

blue colour of copper sulphate fades away due to the formation of iron sulphate .....

Answer 2

Displacement reaction will occur when iron fillings are added to the copper sulfate solution. The perfect reason for this reaction is that Iron is more reactive than the copper. Copper sulfate solution will become as a ferrous sulfate solution as a result of the reaction.

The reaction for the above description is  

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

Observation:  

Color of the copper sulfate solution – blue

The color of the solution will change into light green at the end of the reaction.