Is the decomposition of iron(2) sulphate an endothermic reaction?If yes,why?

Dear Student,

Iron(II) sulphate is normally found in its hydrated form, FeSO₄.7H₂O
On gentle heating this green solid turns white as the water of crystallisation is evolved as steam:
FeSO₄.7H₂O(s) -> FeSO₄(s) + 7H₂O(l)
On stronger heating the anhydrous white solid darkens as iron(III) oxide is formed. Sulphur dioxide and sulphur trioxide are evolved during this decomposition:
FeSO₄(s) -> Fe₂O₃(s) + SO₂(g) + SO₃(g)
Notice that this second stage involves redox as well as thermal decomposition.Now as the decomposition takes place only if we apply the heat and not in situ,hence the reaction in endothermic.