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Dear student
2 FeSO₄​ --> Fe₂​O₃​+SO₂​+SO₃​
ferrous sulphate crystals lose water and anhydrous ferrous sulphate (FeSO₄) is formed. So their colour changes from light green to white.
Fe₂​O₃ is reddish brown
the two gases are SO₂ and SO3
SO₂ gas is an oxidant
SO3 can act as an oxidant/ reductant depending on the nature of the other reactants.
hydrated solution of ferrous sulphate is green in colour whose formula is FeSO₄.7H₂O
Regards