3 цепочки, 25 баллов

18. ZnS-H2S-K2S-H2S-SO2-K2SO3

19. Ca-Ca(OH)2-Ca(NO2)2-HNO3-NH4NO2

20. Al2O3-AlCl3-Al(OH)3-Al2O3-Al2(SO4)3
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