Đáp án `+` Giải thích các bước giải:

`1.`

`SO_3 + H_2 O -> H_2 SO_4`

`2.` Casium `->` Calcium 

`Ca + 2H_2 O -> Ca(OH)_2 + H_2↑`

`3.`

`2KMnO_4` $\xrightarrow{t^o}$ `K_2 MnO_4 + MnO_2 + O_2↑`

`4.`

`Zn + 2HCl -> ZnCl_2 + H_2↑`

`5.`

`Na_2 O + H_2 O -> 2NaOH`

`6.` Diphosphorus `->` Phosphorus 

`4P + 5O_2` $\xrightarrow{t^o}$  `2P_2 O_5`

`9.`

`2KClO_3` $\xrightarrow[MnO_2]{t^o}$ `2KCl + 3O_2↑`

`10.`

`FeO + H_2` $\xrightarrow{t^o}$ `Fe + H_2 O`

`11.`

`2K + 2H_2 O -> 2KOH + H_2↑`

`12.`

`2Al + 3H_2 SO_4 -> Al_2 (SO_4)_3 + 3H_2↑`

$\text{Đáp án+ Giải thích:}$

1. $SO_3$ + $H_2O$ $\rightarrow$ $H_2SO_4$

2. $Ca$ + $2H_2O$ $\rightarrow$ $Ca(OH)_2$ + $H_2$

3. $2KMnO_4$ $\xrightarrow{t^o}$ $K_2MnO_4$ + $MnO_2$ + $O_2$

4. $Zn$ + $2HCl$ $\rightarrow$ $ZnCl_2$ + $H_2$

5. $Na_2O$ + $H_2O$ $\rightarrow$ $2NaOH$

6. $4P$ + $5O_2$ $\xrightarrow{t^o}$ $2P_2O_5$

9. $2KClO_3$ $\xrightarrow{t^o}$ $2KCl$ + $3O_2$

10. $FeO$ + $H_2$ $\xrightarrow{t^o}$ $Fe$ + $H_2O$

11. $2K$ + $2H_2O$ $\rightarrow$ $2KOH$ + $H_2$

12. $2Al$ + $3H_2SO_4$ $\rightarrow$ $Al_2(SO_4)_3$ + $3H_2$