EasyRe-NEET 2026
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The standard electrode potential (E°) for the half-cell reaction Fe³⁺ + e⁻ → Fe²⁺ at 298 K is (Given : E°(Fe³⁺/Fe) = −0.04 V and E°(Fe²⁺/Fe) = −0.44 V at 298 K)
A
+0.40 V
B
+0.76 V
C
−0.48 V
D
+0.92 V
Explanation
Fe³⁺ + 3e⁻ → Fe ...A) Fe²⁺ + 2e⁻ → Fe ...(B) Fe³⁺ + e⁻ → Fe²⁺ ...(C) Eq. (C) = Eq. A) − Eq. (B) ΔG°₃ = ΔG°₁ − ΔG°₂ −nFE°₃ = −nFE°₁ − (−nFE°₂) −A)FE°₃ = −3FE°₁ − (−2FE°₂) E°₃ = 3E°₁ − 2E°₂ = 3(−0.0D) − 2(−0.4D) = −0.12 + 0.88 = +0.76 V
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