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The standard reduction potentials at 25°C of Li+ / Li, Ba2+ / Ba, Na+ / Na and Mg2+ / Mg are -3.03, -2.73, -2.71 and -2.37 respectively. Which one of the following is the strongest oxidising agent?

1. Na+
2. Li+
3. Ba2+
4. Mg2+

Correct answer: Li+

Solution

The strongest oxidizing agent corresponds to the species with the most positive reduction potential. Among the given options, Li+ has the most negative reduction potential (-3.03 V), meaning it is the hardest to reduce and thus the strongest oxidizing agent.

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