По данной цепочке реакций определите название неизвестного вещества A:
A →(t°) B + D
B + C(кокс) → CaC₂ + CO
D + C(кокс) → CO

  1. криолит
  2. сильвин
  3. поваренная соль
  4. известняк

📝 Detailed explanation

CaCO₃ →(t°) CaO + CO₂; CaO + 3C → CaC₂ + CO; CO₂ + C → 2CO. Значит A – известняк (CaCO₃).
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