When ferrous sulphate crystals crystals are heated the residue obtained in the test
tube is _______ coloured.
a. red b. blue c. green d. colourles
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1
Explanation:
When ferrous sulphate crystals are heated, the residue obtained in test tube is red colour
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0
RED
- 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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