1. $Na_{2}O$ + $H_{2}O$ → NaOH
2. MgO + 2HCl →$MgCl_{2}$+ $H_{2}O$
3. $Fe_{2}O_{3}$ + 6HCl → 2$FeCl_{3}$ + 3$H_{2}O$
4. BaO +$CO_{2}$ → $BaCO_{3}$
5. $Fe_{3}O_{4}$ + 4$H_{2}SO_{4}$ → $Fe_{2}({SO_{4}})_3$ +4$H_{2}O$+ $FeSO_{4}$
6. $Al_{2}O_{3}$ + 3$H_{2}SO_{4}$ → $Al_{2}({SO_{4}})_3$ + 3$H_{2}O$
7. $P_{2}O_{5}$ + 3$H_{2}O$ → 2$H_{3}PO_{4}$
8. $Ba(OH)_{2}$ + $CO_{2}$ →$BaCO_{3}$↓ + $H_{2}O$
9. $Mg(OH)_{2}$→MgO+ $H_{2}O$
10. CuO+ $H_{2}SO_{4}$ →$CuSO_{4}$+ $H_{2}O$
