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Fe (in iron nails) + CuSO₄ = FeSO₄ + Cu (displacement reaction)
CuSO₄ + BaCl₂ = CuCl₂ + BaSO₄ (double displacement reaction)
FeSO₄ + BaCl₂ = FeCl₂ + BaSO₄ (double displacement reaction)
CaO + H₂O = Ca(OH)₂
FeSO₄ . 7H₂O (heat) = anhy. FeSO₄ + 7H₂O
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