Lead(IV) oxide, PbO₂, is a good oxidizing agent. Use appropriate data from Appendix D to determine whether PbO₂(s) in a solution with [H₃O⁺] = 1 M is a sufficiently good oxidizing agent to carry the following oxidations to the point at which the concentration of the species being oxidized decreases to one-thousandth of its initial value.

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(a) Fe²+ (1 M) to Fe³+ (b) SO42- (1 M) to S₂08²- 2+ (c) Mn²+ (1 x 104 M) to MnO4