Question

you are provided with three test tube A,B and C which contain sulphate solution do you observe after keeping the iron nails in copper sulphate for about half an hour.

Answer 1

Iron is more reactive metal then copper so it will displace copper also called displacement reaction and form iron sulphate

Answer 2

When we put an iron nail in copper sulphate solution then an displacement reaction take place.

CuSO4+ Fe -----> FeSO4 + Cu

In this reaction iron replaces copper from its salt solution because it lies above than it in activity series.