Question

and keeping Iron nails in blue coloured copper sulphate solution it is observed that the colour of the solution turns light green after some time. Give reason for this colour change. Name the type of reaction?

Answer 1

displacement reaciton, because iron(fe) displaces copper(cu) in reasction. fe + cuso4 = feso4 + cu is the reaction

Answer 2

It is a displacement reaction.
Iron being more reactive than copper displaces copper from its sulphate solution.
The product formed is iron sulphate with copper being deposited at the base of beaker.