Цепочка реакций: ZnS →(+O₂) A →(+O₂, кат) B →(KOH) C. Вещество A – газ, C – средняя соль. Какое вещество выпадет в осадок при добавлении к C раствора BaCl₂?

  1. BaSO₃
  2. BaSiO₃
  3. AgCl
  4. BaSO₄

📝 Detailed explanation

2ZnS+3O₂→2ZnO+2SO₂ (A=SO₂); 2SO₂+O₂→2SO₃ (B=SO₃); SO₃+2KOH→K₂SO₄+H₂O (C=K₂SO₄). K₂SO₄+BaCl₂→BaSO₄↓+2KCl.
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