Осуществите превращение согласно схемам
1) C --> CO2 --> H2CO3 --> BaCO3 --> BaCl2
2)K2CO3 --> CO2 --> CaCO3 ---> CaO --> Ca(OH)2 --> CaCl2
3)Mn(OH)2--> MnCL2 --> Mn -->MnSO4 --> Mn(OH)2 --> MnO
4)Zn --> ZnSO4 --> Zn(OH)2 --> ZnCl2 --> ZnS --> H2S
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