Question

when iron nail is immersed in aqua solution of copper sulphate what are the changes happening in the name to the solution

Answer 1

you will find the iron nail dipped in copper sulphate solution become brown.the blue colour of copper sulphate in the test tube fades.
Fe+CuSO4-------> FeSO4+Cu...
here iron is more reactive than copper ,So it displaces copper from copper sulphate..it is a displacement reaction...