А) Cu--> CuO--> CuCl₂--> Cu(OH)₂--> CuO
2Cu +O₂= 2CuO
CuO + 2HCI = CuCl₂ + H₂O
CuCl₂ + 2NaOH = 2NaCI + Cu(OH)₂↓
Cu(OH)₂ + t = CuO + H₂O
Б) C--> CO₂--> CaCO₃--> CaCI₂
C + O₂ = CO₂
CO₂ + CaO= CaCO₃
CaCO₃ + 2HCI = CaCI₂ + CO₂ + H₂O
В) ZnO--> ZnCl₂--> Zn(OH)₂
ZnO + 2HCI = ZnCI₂ + H₂O
ZnCI₂ + 2NaOH = 2NaCI + Zn(OH)₂