ZnO ---> ZnCl2 ---> Zn(OH)2 ---> Na2[Zn(OH)4) ---> NaNO3

1. ZnO + 2HCl = ZnCl₂ + H₂O

2. ZnCl₂ + 2NaOH = Zn(OH)₂ + 2NaCl

3. Zn(OH)₂ + 2NaOH = Na₂[Zn(OH)₄]

4. Na₂[Zn(OH)₄] + 2HNO₃ = 2NaNO₃ + Zn(OH)₂ + 2H₂O

ZnO + 2HCl = ZnCl2 + H2O