Основание, кислота, соль и кислотный оксид составляют группу веществ: 1)Сu(OH)2, KOH, H2S,Al2O3
2) Fe(OH)2, H2SiO3, Na2S, P2O5
3) Zn(OH)2, CuO, Al2(SO4)3, K2S
4) Ba(OH)2, FeCl3, H3PO4, Fe2O3
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