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What is the standard reduction potential $\small \left ( E^{\circ} \right )$ for Fe³⁺ $\small \rightarrow$ Fe ? Given that: Fe²⁺ + 2e^- $\small \rightarrow$ Fe; $\small E^{\circ}$ _{Fe²⁺ /Fe}= -0.47V Fe³⁺ +e^- $\small \rightarrow$ Fe²⁺; $\small E^{\circ}$ _{Fe³⁺/Fe²⁺}=+0.77V
Option: 1 −0.057 V
Option: 2 +0.057 V
Option: 3 +0.30 V
Option: 4 −0.30 V

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