$(a)$ ${CrO}_{3}$ $(b)$ ${Fe}_{2} {O}_{3}$ $(c)$ ${MnO}_{2}$ $(d)$ ${V}_{2} {O}_{5}$ $(e)$ ${Cu}_{2} {O}$
\((b)\) \(\stackrel{+3} {Fe}_{2} {O}_{3}\)
\((c)\) \(\stackrel{+4} {MnO}_{2}\)
\((d)\) \(\stackrel{+5} {V}_{2} {O}_{5}\)
\((e)\) \(\stackrel{+1} {Cu}_{2} {O}\)
So order of oxidation state \(a>d>c>b>e\)