1. $K_{2}$O + $H_{2}$O → 2KOH

2. $Na_{2}$O + $H_{2}$O → 2NaOH

3. CaO + $H_{2}$O → $Ca(OH)_{2}$ 

4. BaO + $H_{2}$O → $Ba(OH)_{2}$ 

5. 2K + 2$H_{2}$O → 2KOH + $H_{2}$ ↑

6. 2Na + 2$H_{2}$O → 2NaOH + $H_{2}$ ↑

7. Ca + 2$H_{2}$O → $Ca(OH)_{2}$ + $H_{2}$ ↑

8. Ba + 2$H_{2}$O → $Ba(OH)_{2}$ + $H_{2}$ ↑

9. $CO_{2}$ + $H_{2}$O → $H_{2}$$CO_{3}$

10. $SO_{2}$ + $H_{2}$O → $H_{2}$$SO_{3}$

13. 2HCl + Fe → Fe$Cl_{2}$ + $H_{2}$ ↑

14. 6HCl + 2Al → 2Al$Cl_{3}$ + 3$H_{2}$ ↑

15. $H_{2}$$SO_{4}$ + Mg → $MgSO_{4}$ + $H_{2}$ ↑

Câu 11, 12 trùng nhé. Mik cân bằng luôn rồi, xin hay nhất ạ

1/ K2O + H2O -> 2KOH

2/ H2O + 2Na + O2 -> 2NaOH

3/ CaO + H2O -> Ca(OH)2

4/ BaO +H2O -> Ba(OH)2

5/ 2K + 2H2O -> 2KOH + H2

6/ 2Na + 2H2O -> 2NaOH + H2

7/ Ca + 2H2O -> Ca(OH)2 + H2

8/ Ba + 2H2O -> Ba(OH)2 + H2

9/ CO2 + H2O ->H2CO3

10 / SO2 + H2O -> H2SO3

11/ CO2 + H2O -> H2CO3

12/ SO2 + H2O -> H2SO3

13/ 2HCl + Fe -> FeCl2 + H2

14/ 6HCl + 2Al -> 2AlCl3 + 3H2

15/ H2SO4 + Mg -> MgSO4 + H2