Определите степень окисления элементов в следующих веществах (4 балла): а) CuO, AsH3, Al2S3, H5IO6, NaH2PO4 б) Fe2O3, SiH4, Li3N, H4P2O7, KMgCl3 в) N2O4, H2Se, Mg3P2, H2B4O7, KHSO4 г) P2O5, BH3, Ca2Si, H2SеO3, Cu(NO3)2
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