Question

What green iron salt and heated storangly its colours finally changes to black and odour of burning sulphur is giving out.
a: which type of reaction takes place during the heat of iron salt

Answer 1

1) Ferrous Sulphate

2) Thermal decomposition

3) 2 FeSO4 (s)   Heat → Fe2O3 (s)+ SO2 (g) + SO3 (g)

       Ferrous sulphate            Ferric oxide

      Green Colored                 Reddish brown