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Identify the reaction from following having top position in EMF series (Std.red. potential) according to their electrode potential at 298K.

NEET UG 2020 — Chemistry Physical Chemistry

2020mcqmedium

Identify the reaction from following having top position in EMF series (Std.red. potential) according to their electrode potential at 298K.298K.298K.

Official previous-year question

Held on 30 Apr 2020 · Verified 9 Jul 2026.

Options

  1. A

    Mg2++2e−→Mg(s){\mathrm{Mg}}^{2+}+2{e}^{-}\rightarrow {\mathrm{Mg}}_{(s)}Mg2++2e−→Mg(s)​

  2. B

    Fe2++2e−→Fe(s){\mathrm{Fe}}^{2+}+2{e}^{-}\rightarrow {\mathrm{Fe}}_{(s)}Fe2++2e−→Fe(s)​

  3. C

    Au3++3e−→Au(s){\mathrm{Au}}^{3+}+3{e}^{-}\rightarrow {\mathrm{Au}}_{(s)}Au3++3e−→Au(s)​

  4. D

    K++e−→K(s){K}^{+}+{e}^{-}\rightarrow {K}_{(s)}K++e−→K(s)​

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