Question

while studying the displacement reaction by heating hydrated ferrous sulphate crystal in a test tube what do you observe,a.) in the beginning as you started heating?,b.) after some time if heating ?​

Answer 1

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a.) the green colour of the crystal changes to brown.

b.) A smell of burning sulphur is felt

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Answer 2

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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).