решите цепочки а)Ca-->CaO-->Ca(OH)2--->Ca(NO3)2--->CaSO4 б)Al2O3-->AL2(SO4)3--->AL(OH)3-->AL2O3 в)Cu---CuCl2--->Cu(OH)2--->CuO-->cU--->CuSO4--->Cu(OH2)

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