Examine the following half-reactions and select the weakest oxidizing agent among the species listed.

Question

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In order for a species to be a good oxidizing agent, it must have a high tendency to gain electrons (i.e. be reduced). The half-reaction for potassium (K) in option C is K+ + e- → K, which has a reduction potential of -2.92 V. This is the least favorable reduction potential, meaning that potassium has the lowest tendency to gain electrons and therefore is the weakest oxidizing agent.

Examine the Following Half-Reactions and Select the Weakest Oxidizing Agent