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CBSE - X - Chemistry

Q. If Ferrous sulphate crystals or FeSO4.7H2O are heated they give Ferrous Sulphate .Ferrous Sulphate Crystals are of green colour but on heating what is colour of Ferrous Sulphate [I am confused as in some books it is given dirty white and in some green]
I shall be thankful to you.
And thanks expert for answering my previous question.

Asked by Ananay 11th March 2017, 7:38 PM
Answered by Expert



  • Ferrous sulphate crystals contain water molecules as water of crystalisation - (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. 
Answered by Expert 14th March 2017, 5:11 PM

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