Identify the reaction from following having top position in EMF series (Std.red. potential) according to…

1. ${\mathrm{Mg}}^{2+}+2{\mathrm{e}}^{-}\to {\mathrm{Mg}}_{\left(\mathrm{s}\right)}$
2. ${\mathrm{Fe}}^{2+}+2{\mathrm{e}}^{-}\to {\mathrm{Fe}}_{\left(\mathrm{s}\right)}$
3. ${\mathrm{Au}}^{3+}+3{\mathrm{e}}^{-}\to {\mathrm{Au}}_{\left(\mathrm{s}\right)}$
4. ${\mathrm{K}}^{+}+ {\mathrm{e}}^{-}\to {\mathrm{K}}_{\left(\mathrm{s}\right)}$

Solution

Asked in: NEET 2020 (Phase 2)

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