1. Определите степень окисления химических элементов в соединениях:
a) H2S, PCl5, OF2, Al4C3, HBr, Ca3P2, FeCl3, HNO3, Na2O, N2O5.
b) NO, Mn2O7, NaOH, SO2, Ag2O, Cl2O, Fe2O3, Al(OH)3.
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