Examgyani Team
Asked: November 5, 20232023-11-05T11:35:55+05:30
2023-11-05T11:35:55+05:30In: Science
What is the colour of ferrous sulphate crystals?
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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.Â
In this reaction, the single reactant FeSO4Â decomposes to form three different products. So, the reaction is a decomposition reaction.
2FeSO4(s)→Fe2O3(s)+SO2(g)+SO3(g)2FeSO4(s)→Fe2O3(s)+SO2(g)+SO3(g)
Ahydrous ferrous   Ferric oxide
Sulphate (white)Â Â Â (brown)