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Question:

Given E°Cl₂/Cl⁻ = 1.36 V, E°Cr³⁺/Cr = -0.74 V, E°Cr₂O₇²⁻/Cr³⁺ = 1.33 V, E°MnO₄⁻/Mn²⁺ = 1.51 V. Among the following, the strongest reducing agent is: Cr³⁺, Mn²⁺, Cl⁻, Cr

Mn2+

Cl−

Cr

Cr3+

Solution:

Cr is the strongest reducing agent as the standard electrode potential E°Cr³⁺/Cr = -0.74 V is most negative.