what happens when ferrous sulphate decomposes ?

Ferrous sulphate is basically a hydrated salt. The most commonly available form of hydrated ferrous sulphate contains seven molecules of water of crytsallisation and therefore it is represented by the chemical formula FeSO₄.7H₂O. This salt is blue-green in colour. On heating it loses the seven molecules of water of crystallisation and forms anhydrous ferrous sulphate, which is greenish white in colour. When anhydrous ferrous sulphate is further heated, it decomposes to give sulphur dioxide, sulphur trioxide and ferric oxide (Fe₂O₃), which is reddish brown in colour. This is an example of decomposition reaction. Following is the equation for the reaction