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What products are formed when ferrous sulfate crystals are heated in a test tube?

What products are formed when ferrous sulfate crystals are heated in a test tube? Correct Answer Ferric oxide + water + sulfur dioxide + sulfur trioxide

The correct answer is Ferric oxide + water + sulfur dioxide + sulfur trioxide.

  • On heating, ferrous sulphate crystals lose water and anhydrous ferrous sulphate (FeSO4) is formed.

Additional Information

  • 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. 
  • 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. 

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