c) FeS2→ SO2→ SO3→ H2SO4→ NaHSO4→ Na2SO4→ NaOH→ Na2SO3→ NaHSO3→ SO2 d) Na→ Na2O→ Na2CO3→ NaCl→ NaOH→ NaH2PO4→ Na2HPO4→ Na3PO4→ Na2SO

Em tham khảo nha:

\(\begin{array}{l}
c)\\
4Fe{S_2} + 11{O_2} \xrightarrow{t^0} 2F{e_2}{O_3} + 8S{O_2}\\
2S{O_2} + {O_2}\xrightarrow{t^0,V_2O_5} 2S{O_3}\\
S{O_3} + {H_2}O \to {H_2}S{O_4}\\
{H_2}S{O_4} + NaOH \to NaHS{O_4} + {H_2}O\\
NaHS{O_4} + NaOH \to N{a_2}S{O_4} + {H_2}O\\
N{a_2}S{O_4} + Ba{(OH)_2} \to 2NaOH + BaS{O_4}\\
2NaOH + S{O_2} \to N{a_2}S{O_3} + {H_2}O\\
N{a_2}S{O_3} + S{O_2} + {H_2}O \to 2NaHS{O_3}\\
NaHS{O_3} + HCl \to NaCl + S{O_2} + {H_2}O\\
d)\\
4Na + {O_2} \xrightarrow{t^0} 2N{a_2}O\\
N{a_2}O + C{O_2} \to N{a_2}C{O_3}\\
N{a_2}C{O_3} + 2HCl \to 2NaCl + C{O_2} + {H_2}O\\
2NaCl + 2{H_2}O \xrightarrow{\text{ điện phân dung dịch có màng ngăn }} 2NaOH + C{l_2} + {H_2}\\
NaOH + {H_3}P{O_4} \to Na{H_2}P{O_4} + {H_2}O\\
Na{H_2}P{O_4} + NaOH \to N{a_2}HP{O_4} + {H_2}O\\
N{a_2}HP{O_4} + NaOH \to N{a_3}P{O_4} + {H_2}O
\end{array}\)