Giải thích các bước giải:
a)
\(\begin{array}{l}
2KMn{O_4} \to Mn{O_2} + {O_2} + {K_2}Mn{O_4}\\
{O_2} + S \to S{O_2}\\
2S{O_2} + {O_2} \to 2S{O_3}\\
S{O_3} + {H_2}O \to {H_2}S{O_4}\\
{H_2}S{O_4} + Cu{(OH)_2} \to CuS{O_4} + 2{H_2}O\\
CuS{O_4} + BaC{l_2} \to CuC{l_2} + BaS{O_4}\\
CuC{l_2} + 2AgN{O_3} \to Cu{(N{O_3})_2} + 2AgCl
\end{array}\)
b)
\(\begin{array}{l}
2{H_2}S + S{O_2} \to 2{H_2}O + 3S\\
S + {O_2} \to S{O_2}\\
S{O_2} + 2NaOH \to N{a_2}S{O_3} + {H_2}O\\
N{a_2}S{O_3} + 2HCl \to 2NaCl + {H_2}O + S{O_2}\\
2S{O_2} + 2{H_2}O + {O_2} \to 2{H_2}S{O_4}\\
{H_2}S{O_4} + Fe \to F{e_2}{(S{O_4})_3} + S{O_2} + {H_2}O\\
F{e_2}{(S{O_4})_3} + 3BaC{l_2} \to 2FeC{l_3} + 3BaS{O_4}\\
FeC{l_3} + 3KOH \to Fe{(OH)_3} + 3KCl
\end{array}\)
c)
\(\begin{array}{l}
Fe + S \to FeS\\
FeS + 2HCl \to FeC{l_2} + {H_2}S\\
2{H_2}S + S{O_2} \to 2{H_2}O + 3S\\
S + {O_2} \to S{O_2}\\
S{O_2} + N{a_2}O \to N{a_2}S{O_3}\\
N{a_2}S{O_3} + {H_2}S{O_4} \to N{a_2}S{O_4} + S{O_2} + {H_2}O\\
S{O_2} + N{a_2}S{O_3} + {H_2}O \to 2NaHS{O_3}
\end{array}\)
e)
\(\begin{array}{l}
_{2KCl{O_3} \to 2KCl + 3{O_2}}\\
3{O_2} \to 2{O_3}\\
{O_3} + 2KI + {H_2}O \to {I_2} + 2KOH + {O_2}\\
KOH + FeS{O_4} \to {K_2}S{O_4} + Fe{(OH)_2}\\
{K_2}S{O_4} + BaC{l_2} \to 2KCl + BaS{O_4}\\
KCl + AgN{O_3} \to KN{O_3} + AgCl
\end{array}\)
