Chapter 19, Problem 13QP

hich of the following reagents can oxidize ${\text{H}}_{\text{2}}{\text{O to O}}_{\text{2}}\left(g\right)$ under standard-state conditions: ${\text{H}}^{\text{-}}\left(aq\right){\text{, Cl}}^{\text{-}}\left(aq\right){\text{, Cl}}_{\text{2}}\left(g\right){\text{, Cu}}^{\text{2+}}\left(\text{aq}\right){\text{, Pb}}^{\text{2+}}\left(aq\right){\text{,MnO}}_{\text{4}}\text{(}aq\text{) }\left(\text{in acid}\right)\text{?}$