Question

When iron nails are dipped in the solution of copper sulphate, then why does color of solution change?

Answer 1

because iron is more reactive and it displace the copper

Answer 2

.Iron(fe) is more reactive than copper(cu) .

.Iron displace copper from cuso4 to form ferros sulphate.

.Due to this iron change its color when it is dipped in cuso4.