Verified answer

2) Na₂O + H₂O = 2NaOH

NaOH + NH₄NO₃ = NaNO₃ + NH₄OH (разлагается на NH₃ + H₂O)

NH₄OH ⇔ NH₃ + H₂O

3) CuO + 2HNO₃ = Cu(NO₃)₂ + H₂O

Cu(NO₃)₂ + 2KOH = Cu(OH)₂↓ + 2KNO₃

Cu(OH)₂ = CuO + H₂O

4) Na₂O + CO₂ = Na₂CO₃

Na₂CO₃ + CaCl₂ = 2NaCl + CaCO₃↓

NaCl + AgNO₃ = NaNO₃ + AgCl↓

2NaNO₃ = 2NaNO₂ + O₂↑