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The following are unbalanced equations. They show the kinds of reactants and products involved but n quantity of each. For each equation, select the correct reaction type.

$($a$)HBrlongrightarrow{H}_2+B{r}_2$

$($b$)P_2{O}_5+H_{2}Olongrightarrow{H}_{3}P{O}_4$

$($c$)H_{2}S+O_{2}longrightarrow{H}_{2}O+S{O}_2$

$($d$)HCl+F{e}_2{O}_{3}longrightarrow{H}_{2}O+FeC{l}_3$