\( Zn + AgNO _{3} \longrightarrow Zn \left( NO _{3}\right)_{2}+ Ag \)
\( Mg + AlCl _{3} \longrightarrow MgCl _{2}+ Al \)
\( Na + ZnSO _{4} \longrightarrow Na _{2} SO _{4}+ Zn \)
\( CH _{4}+ O _{2} \longrightarrow CO _{2}+ H _{2} O \)
\( CH _{4}+ O _{2} \longrightarrow CO + H _{2} O \)
\( CH _{4}+ O _{2} \longrightarrow C + H _{2} O \)
\( C _{6} H _{12} O _{6}+ O _{2} \longrightarrow CO _{2}+ H _{2} O \)
\( CoCl _{2}+ H _{2} O \longrightarrow CoCl _{2} \cdot 5 H _{2} O \)
