Question

what happens if we heat FeSO4

Answer 1

Hi Ananya !
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If we heat FeSO4:-

A decomposition reaction takes place i.e.

2FeSO4(s)→Fe2O3(s)+SO2(g)+SO3(s)

Ferrous sulphate crystals contain water molecules (FeSO4. 7H2O). when we heat it . its  crystals lose water and anhydrous ferrous sulphate (FeSO4) is formed. So their color changes from light green to white.
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Answer 2

It is a decomposition reaction

Refer the equation

2FeSO₄ --------> Fe₂O₃ + SO₂ + SO₃

Observations :

1) The products obtained are ferric oxide, sulfur oxide and sulfur trioxide
2)On heating the color changes from light green to brown (Fe₂O₃)
3) The gas emitted has odor of burning sulfur.

Hope This Helps You!