a)
KMnO4 \(\rightarrow\) Cl2 \(\rightarrow\) HCl \(\rightarrow\) NaCl \(\rightarrow\)AgCl
NaClO \(\leftrightarrow\) Cl2 \(\rightarrow\) FeCl3 \(\leftarrow\) FeCl2 \(\leftarrow\) HCl
b) KI \(\rightarrow\) I2 \(\rightarrow\) HI \(\rightarrow\) HCl \(\rightarrow\)KCl \(\rightarrow\)Cl2 \(\rightarrow\) HClO \(\rightarrow\)O2 \(\rightarrow\)Cl2 \(\rightarrow\)Br2 \(\rightarrow\)I2
b, PTHH :
\(2KI+SO_3\rightarrow2I+K_2SO_3\)
\(I_2+H_2\rightarrow2HI\)
\(2HI+Cl_2\rightarrow2HCl+I_2\)
\(HCl+KOH\rightarrow KCl+H_2O\)
\(F_2+2KCl\rightarrow Cl_2+2KF\)
\(Cl_2+H_2O\rightarrow HClO+HCl\)
\(HClO\rightarrow HCl+O_2\)
\(4HCl+O_2\rightarrow2H_2O+2Cl_2\)
\(Cl_2+2NaBr\rightarrow2NaCl+Br_2\)
\(Br_2+2NaI\rightarrow2NaBr+I_2\)