Определите валентность элементов по формулам оксидов и назовите вещества: CO, SO2, Fe2O3, P2O3, Na2O, CaO, MnO2, SnO2, I2O5, H2O, P2O5, CO2, FeO, NO, Na2O, CaO, Mn2O7, SnO2, I2O5, H2O
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