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  4. What is the standard reduction potential (E°) for Fe3+ → Fe ? Given that: Fe2+ + 2e- arrow Fe ; E°Fe2+ / Fe = - 0.47 V Fe3+ + e- arrow Fe2+ ; E°Fe3+ / Fe2+ = + 0.77 V

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Q. What is the standard reduction potential $(E^{\circ}) $ for $\ce{Fe^{3+} \to Fe}$ ?
Given that :
$Fe^{2+} + 2e^{-} \rightarrow Fe ; E^{\circ}_{Fe^{2+} / Fe} = - 0.47\, V $
$Fe^{3+} + e^{-} \rightarrow Fe^{2+} ; E^{\circ}_{Fe^{3+} / Fe^{2+}} = + 0.77 V $

JEE MainJEE Main 2017Electrochemistry

Solution:

Correct answer is (a) $-0.057\, V$