Em tham khảo nha :
\(\begin{array}{l}
11)\\
P + 5HN{O_3} \to {H_3}P{O_4} + 5N{O_2} + {H_2}O\\
{N^{ + 5}} + 1e \to N{O_2}\\
{P^0} \to {p^{ + 5}} + 5e\\
12)\\
S + 2{H_2}S{O_4} \to 3S{O_2} + 2{H_2}O\\
{S^0} \to {S^{ + 4}} + 4e\\
{S^{ + 6}} + 2e \to {S^{ + 4}}\\
13)\\
C + 2{H_2}S{O_4} \to C{O_2} + 2S{O_2} + 2{H_2}O\\
{C^0} \to {C^{ + 4}} + 4e\\
{S^{ + 6}} + 2e \to {S^{ + 4}}\\
14)\\
2P + 5{H_2}S{O_4} \to 5S{O_2} + 2{H_3}P{O_4} + 2{H_2}O\\
{P^0} \to {P^{ + 5}} + 5e\\
{S^{ + 6}} + 2e \to {S^{ + 4}}
\end{array}\)
