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Consider the half-cell reduction reaction: … The E° for the reaction 3 Mn^2+ → Mn^0 +2 Mn^3+, and possibility of the forward reaction are respectively

NEET UG 2013 — Chemistry Physical Chemistry

2013mcqeasy

Consider the half-cell reduction reaction: Mn2++2e−→Mn,Eo=−1.18 VMn2+→Mn3++e−,Eo=1.51 V\begin{aligned} & \mathrm{Mn}^{2+}+2 e^{-} \rightarrow \mathrm{Mn}, \mathrm{E}^{\mathrm{o}}=-1.18 \mathrm{~V} \\ & \mathrm{Mn}^{2+} \rightarrow \mathrm{Mn}^{3+}+e^{-}, \mathrm{E}^{\mathrm{o}}=1.51 \mathrm{~V} \end{aligned}​Mn2++2e−→Mn,Eo=−1.18 VMn2+→Mn3++e−,Eo=1.51 V​ The E∘\mathrm{E}^{\circ}E∘ for the reaction 3Mn2+→Mn03 \mathrm{Mn}^{2+} \rightarrow \mathrm{Mn}^03Mn2+→Mn0 +2Mn3++2 \mathrm{Mn}^{3+}+2Mn3+, and possibility of the forward reaction are respectively

Official previous-year question

Held on 30 Apr 2013 · Verified 9 Jul 2026.

Options

  1. A

    −4.18 V-4.18 \mathrm{~V}−4.18 V and yes

  2. B

    +0.33 V+0.33 \mathrm{~V}+0.33 V and yes

  3. C

    +2.69 V+2.69 \mathrm{~V}+2.69 V and no

  4. D

    −2.69 V-2.69 \mathrm{~V}−2.69 V and no

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