Fe+CuSO4  = Cu+FeSO4, HCl+NaOH = NaCl+H2O, CuSO4+NaOH  = Na2SO4+Cu(OH)2, CaCl2+Na2SO4 =2NaCl+CaSO4, 2AgNO3+Na2CrO4 = Ag2CrO4+2NaNO3, Cl2+Na = NaCl,

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