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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​Ois reddish brown
the two gases are SOand 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

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