EᶱCr2O72-/Cr3+ = 1.33V
EᶱMnO4–/Mn2+ = 1.51V
EᶱCl2/Cl– = 1.36V
EᶱCr3+/Cr = -0.74V
(i) Cl–
(ii) Cr
(iii) Cr3+
(iv) Mn
Correct Answer: (ii) Cr
Explanation: The most powerful reducing agent is easily oxidized, that is, with the greatest oxidation potential. Thus, Cr is the strongest reducing agent.