Neco Model Questions Vol1 2020 Chemistry Question 32
Practice objective / multiple choice question 32 from the 2020 Neco Model Questions Vol1 Chemistry examination.
In acidic solution the redox reaction \(\mathrm{MnO_4^- + Fe^{2+} \rightarrow Mn^{2+} + Fe^{3+}}\) occurs. The standard reduction potentials are \(E^{\circ}(\mathrm{MnO_4^- / Mn^{2+}}) = +1.51\ \text{V}\) and \(E^{\circ}(\mathrm{Fe^{3+} / Fe^{2+}}) = +0.77\ \text{V}\). The reaction is carried out at 25 °C with \([\mathrm{Fe^{2+}}] = 0.010\ \text{M}\), \([\mathrm{Fe^{3+}}] = 0.10\ \text{M}\), \([\mathrm{MnO_4^-}] = 0.020\ \text{M}\) and \([\mathrm{Mn^{2+}}] = 0.050\ \text{M}\). Calculate the cell potential \(E\) under these non‑standard conditions using the Nernst equation and state whether the reaction is spontaneous.
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This is Neco Model Questions Vol1 2020 Chemistry Question 32. It is one of the objective questions from the 2020 Neco Model Questions Vol1 Chemistry examination.
Difficulty level: Medium .
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