1) 2CO + O₂ = 2СO₂
2) CO₂ + CaO → CaCO₃
3) CaCO₃ + 2HCl → H₂CO₃ + CaCl₂
4) CaCl₂ + 2HNO₃ → 2HCl + Ca(NO₃)₂
1) 2CO + O₂ = 2СO₂
2) CO₂ + CaO → CaCO₃
3) CaCO₃ + 2HCl → H₂CO₃ + CaCl₂
4) CaCl₂ + 2HNO₃ → 2HCl + Ca(NO₃)₂