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Chemistry · Electrochemical cells: Electrolytic and Galvanic cells, different types of electrodes, electrode potentials including standard electrode potential, half-cell and cell reactions

Among the following, the couple with most positive reduction potential is :

Among the following, the couple with most positive reduction potential is :

  • A. \( M n^{+3} / M n^{+2} \)
  • B. \( C r^{+3} / C r^{+2} \)
  • C. \( F e^{+3} / F e^{+2} \)
  • D. \( C o^{+3} / C o^{+2} \)

Step-by-step solution

Standard reduction potentials: Mn3+/Mn2+ ≈ +1.51 V, Cr3+/Cr2+ ≈ -0.41 V, Fe3+/Fe2+ ≈ +0.77 V, Co3+/Co2+ ≈ +1.92 V. Co3+/Co2+ has the highest value, making it the most positive reduction potential.
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