Chemistry · 2017
JEE Main · 8 April 2017, Shift 1 · Q35
What is the standard reduction potential (E°) for Fe^3+ → Fe? Given that: Fe^2++2 e^- → Fe; E_Fe^2+ / Fe^°=-0.47 V; Fe^3++ e^- → Fe^2+; E_Fe^3+ /…
What is the standard reduction potential (E°) for $\displaystyle \mathrm{Fe}^{3+} \rightarrow \mathrm{Fe}$ ?
Given that :
$$\begin{aligned}
& \mathrm{Fe}^{2+}+2 \mathrm{e}^{-} \rightarrow \mathrm{Fe} ; \mathrm{E}_{\mathrm{Fe}^{2+} / \mathrm{Fe}}^{\circ}=-0.47 \mathrm{~V} \\
& \mathrm{Fe}^{3+}+\mathrm{e}^{-} \rightarrow \mathrm{Fe}^{2+} ; \mathrm{E}_{\mathrm{Fe}^{3+} / \mathrm{Fe}^{2+}}^{\circ}=+0.77 \mathrm{~V}
\end{aligned}
$$
Official answer
(1)
-$\displaystyle 0.057$ V
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JEE Main 2017 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.