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What is the Colour of Ferrous Sulphate Crystals How Does this Colour Change After Heating

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Answer: The colour that ferrous sulphate crystals (FeSO4.7H2O) exhibit is light green. 

On heating, the water in the crystals evaporates, resulting in the formation of anhydrous ferrous sulphate (FeSO4), which changes the crystals’ colour from light green to white. The chemical reaction is FeSO4⋅7H2O(s) heat→ FeSO4+7H2O.

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