Question:
Which of the following half-cell reaction has the most negative standard electrode potential?
Which of the following half-cell reaction has the most negative standard electrode potential?
Show Hint
Think of the alkali metals. Lithium is the smallest and has the highest hydration energy, which contributes to its extremely negative electrode potential in aqueous solutions.
Updated On: Apr 29, 2026
- Li\(^+\)(aq)+ e\(^-\) \(\to\) Li(s)
- F\(_2\)(g) +2e\(^-\) \(\to\) 2F\(^-\)(aq)
- Na\(^+\)(aq) + e\(^-\) \(\to\) Na(s)
- I\(_2\)(aq) + 2e\(^-\) \(\to\) 2I\(^-\)(aq)
- Cu\(^+\)(aq) + e\(^-\) \(\to\) Cu(s)
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Standard electrode potential (\(E^\circ\)) measures the tendency of a chemical species to be reduced.
A most negative value means the species has the lowest tendency to be reduced and the highest tendency to be oxidized (best reducing agent).
Step 3: Detailed Explanation:
The electrochemical series lists elements in order of their standard reduction potentials.
- Lithium (Li) is at the very top of the electrochemical series with the most negative reduction potential (approx -3.05 V). This makes it the strongest reducing agent.
- Fluorine (F\(_2\)) has the most positive reduction potential (approx +2.87 V), making it the strongest oxidizing agent.
- Sodium (Na) is also negative but less negative than Lithium.
- Iodine and Copper have positive reduction potentials.
Step 4: Final Answer:
The half-cell reaction for Lithium has the most negative standard electrode potential.
Standard electrode potential (\(E^\circ\)) measures the tendency of a chemical species to be reduced.
A most negative value means the species has the lowest tendency to be reduced and the highest tendency to be oxidized (best reducing agent).
Step 3: Detailed Explanation:
The electrochemical series lists elements in order of their standard reduction potentials.
- Lithium (Li) is at the very top of the electrochemical series with the most negative reduction potential (approx -3.05 V). This makes it the strongest reducing agent.
- Fluorine (F\(_2\)) has the most positive reduction potential (approx +2.87 V), making it the strongest oxidizing agent.
- Sodium (Na) is also negative but less negative than Lithium.
- Iodine and Copper have positive reduction potentials.
Step 4: Final Answer:
The half-cell reaction for Lithium has the most negative standard electrode potential.
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