Fergus sulphate on heating gives deric oxide along with the evolution of sulphur dioxide and sulphur trioxide gases
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Ferrous sulphate crystals contain water molecules (FeSO4. 7H2O). ... On further heating, anhydrous ferrous sulphate decomposes to form ferric oxide (Fe2O3), sulphur dioxide (SO2) and sulphur trioxide (SO3). So, the gas emitted smells like burning sulphur.
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2FeSO4 ------> Fe2O3 + SO2 + SO3
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