Правильно: SO2, CO, N2O5, SiO2, H2O, P2O5, CO2, CaO, Al2O3, Na2O, Неправильно: HNO3, KOH, CaCl2, NaNO3, Ba(OH)2, H2SO4, H2S, NaOH, K2CO3, CH3OH,

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