Question

The standard redox potential of MnO4– / Mn+2 systems is

• A. +1.52 V
• B. -0.51 V
• C. +0.77 V
• D. -0.06 V

Hint:

The standard redox potential of a reaction indicates the strength of the species as an oxidizing or reducing agent. Higher values suggest a stronger oxidizing agent.

Answer 1

The Correct Option is C

Step 1: Understanding redox potentials.
Redox potentials measure the tendency of a chemical species to gain electrons and be reduced. The standard redox potential is a constant for a given reaction under standard conditions.
Step 2: Analyzing the options.

• (A) +1.52 V: Incorrect. This is a high redox potential, but it does not correspond to the MnO4– / Mn+2 system.
• (B) -0.51 V: Incorrect. A negative value indicates a tendency to lose electrons, which is not typical for the MnO4– / Mn+2 system.
• (C) +0.77 V: Correct. The standard redox potential for the MnO4– / Mn+2 system is +0.77 V, indicating a moderate tendency for reduction.
• (D) -0.06 V: Incorrect. This value is too low and does not correspond to the MnO4– / Mn+2 system.

Step 3: Conclusion.
The standard redox potential of the MnO4– / Mn+2 system is +0.77 V, making option (C) the correct answer. Final Answer:} +0.77 V.