a,
Phương pháp nhiệt phân:
$AgNO_3\buildrel{{t^o}}\over\to Ag+NO_2+\dfrac{1}{2}O_2$
Phương pháp thuỷ luyện:
$Mg+2AgNO_3\to Mg(NO_3)_2+2Ag$
b,
- $ZnS$/
$ZnS+1,5O_2\buildrel{{t^o}}\over\to ZnO+SO_2$
$ZnO+CO\buildrel{{t^o}}\over\to Zn+CO_2$
$ZnS+2HCl\to ZnCl_2+H_2S$
$ZnCl_2+Mg\to MgCl_2+Zn$
- $ZnCO_3$:
$ZnCO_3\buildrel{{t^o}}\over\to ZnO+CO_2$
$ZnO+CO\buildrel{{t^o}}\over\to Zn+CO_2$
$ZnCO_3+2HCl\to ZnCl_2+H_2O+CO_2$
$ZnCl_2+Mg\to MgCl_2+Zn$
c,
$SnO_2+2CO\buildrel{{t^o}}\over\to Sn+2CO_2$
d,
$PbS+1,5O_2\buildrel{{t^o}}\over\to PbO+SO_2$
$PbO+H_2\buildrel{{t^o}}\over\to Pb+H_2O$