Ferris sulphate on heating give ferric oxide sulphur dioxide and sulphur trioxide skeleton equation
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Ferrous sulphate crystals contain water molecules (FeSO4. 7H2O). On heating, ferrous sulphate crystals lose water and anhydrous ferrous sulphate (FeSO4) is formed. So their colour changes from light green to white.
2FeSO4(aq) →Fe2O3(s) + SO2(g) + SO3(g)
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