ACIDI: Mn2O7, CrO3, SO3, I2O, Cl2O7, P2O5, N2O5, As2O3, Sb2O5, BASICI: CaO, Fe 2O 3 , Al2O3, PbO2, HgO, Bi2O3, Cr2O3, MnO2, SnO,

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