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1)

$\rightarrow$ $\text{2Na+2H2O$\rightarrow$2NaOH+H2}$

$\rightarrow$ $\text{Ca+2H2O$\rightarrow$Ca(OH)2+H2}$

$\rightarrow$ $\text{2K+2H2O$\rightarrow$2KOH+H2}$
$\rightarrow$ $\text{Ba+2H2O$\rightarrow$Ba(OH)2+H2}$

2)

$\rightarrow$ $\text{Mg+2HCl$\rightarrow$MgCl2+H2}$
$\rightarrow$ $\text{Zn+H2SO4$\rightarrow$ZnSO4+H2}$

$\rightarrow$ $\text{Fe+H2SO4$\rightarrow$FeSO4+H2}$

$\rightarrow$ $\text{Ba+2HCl$\rightarrow$BaCl2+H2}$

3)

$\rightarrow$ $\text{Fe+Pb(NO3)2$\rightarrow$Fe(NO3)2+Pb}$

$\rightarrow$ $\text{Cu+2AgNO3$\rightarrow$Cu(NO3)2+2Ag}$

$\rightarrow$ $\text{3Mg+Al2(SO4)3$\rightarrow$3MgSO4+2Al}$

$\rightarrow$ $\text{Zn+CuSO4$\rightarrow$ZnSO4+Cu}$

4)

$\rightarrow$ $\text{CuO+CO$\xrightarrow{t^o}$Cu+CO2}$

$\rightarrow$ $\text{ZnO+H2$\xrightarrow{t^o}$Zn+H2O}$

$\rightarrow$ $\text{Fe2O3+3CO$\xrightarrow{t^o}$2Fe+3CO2}$

$\rightarrow$ $\text{PbO+H2$\xrightarrow{t^o}$Pb+H2O}$

#TRANPHAMGIABAO