The standard reduction potentials at 298 K for the following half reactions are given against each. Which is the strongest reducing agent?
Correct answer: A. Zn(s)
- A. Zn(s)
- B. Cr(s)
- C. H2(g)
- D. Fe2+(aq)
Explanation
The strongest reducing agent is the one that is most easily oxidized, which corresponds to the element or compound with the lowest standard reduction potential. Among the given options, Zn2+(aq) has the lowest reduction potential, meaning Zn(s) is most readily oxidized. Therefore, Zn(s) is the strongest reducing agent. On the other hand, Cr(s), H2(g), and Fe2+(aq) all have higher reduction potentials than Zn, making them less effective as reducing agents.
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Electrochemistry describes electron transfer through oxidation and reduction, identifies oxidizing and reducing agents, and applies oxidation numbers to balance redox equations. It also covers electrode potential and the standard hydrogen electrode, which provides the reference for comparing the reduction tendencies of other electrodes.
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