What is the colour of ferrous sulphate crystals?

Hi, I have a question and I hope anyone could answer it:

  1. What is the colour of ferrous sulphate crystals? How does this colour change after heating?
  2. Name the product formed on strongly heating ferrous sulphate crystals. What type of chemical reaction occurs in this change?

1 Answer

  1. Answer:

    (i) The color of ferrous sulphate crystals is green.

    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.

    (ii) 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. 

    In this reaction, the single reactant FeSO4 decomposes to form three different products. So, the reaction is a decomposition reaction.


    Ahydrous ferrous     Ferric oxide

    Sulphate (white)      (brown)


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