Bài 1:
$2HCl \buildrel{{đpdd}}\over\longrightarrow H_2+ Cl_2$
$2NaCl \buildrel{{đpnc}}\over\longrightarrow 2Na+ Cl_2$
$KClO_3+ 6HCl \rightarrow KCl+ 3Cl_2+ 3H_2O$
Bài 2:
$NaCl+ H_2SO_4 \buildrel{{t^o}}\over\longrightarrow NaHSO_4+ HCl$
$Fe+ 2HCl \rightarrow FeCl_2+ H_2$
$2NaCl+ 2H_2O \buildrel{{đpmn}}\over\longrightarrow 2NaOH+ H_2+ Cl_2$
$2FeCl_2+ Cl_2 \rightarrow 2FeCl_3$
$Cl_2+ H_2O \rightleftharpoons HCl+ HClO$