Question

what change are observed when Iron nails put in blue coloured copper sulphate solution give the chemical equation and name type of reaction

Answer 1

That's copper. When Iron nail (Ferrum) is dipped in Copper sulphate (CuSO4) there takes reaction between them and coppersulphate change its color from blue to light green. This shows Iron is more reactive than Copper, it can replace Copper from CuSO4.

Answer 2

when Iron nails are put in blue coloured copper sulphate solution then the iron will displace copper from its solution and form of green coloured solution i. e. iron sulphate solution
Fe+CuSo4 -------------> Cu +FeSO4
blue. green
colour. colour
It is a displacement reaction