a, $4Al+ 3O_2 \buildrel{{t^o}}\over\longrightarrow 2Al_2O_3$
b, $C+ O_2 \buildrel{{t^o}}\over\longrightarrow CO_2$
c, $2H_2+ O_2 \buildrel{{t^o}}\over\longrightarrow 2H_2O$
d, $2CO+ O_2 \buildrel{{t^o}}\over\longrightarrow 2CO_2$
e, $2KClO_3 \buildrel{{t^o}}\over\longrightarrow 2KCl+ 3O_2$