Скласти рівняння реакцій за схемою :
a) S - SO2 - SO3 - H2SO4 - Na2SO4 - BaSO4
б) Ba - BaO - Ba(OH)2 - BaCL2 - BaCO3
в) CuSO4 - Cu(OH)2 - CuO - CuCL2 - Cu(NO3)2 - CuS
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