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Identify the reaction from following having top position in EMF series (Std. red. potential) according to their electrode potential at 298 K.
A
$K^++1e^-\rightarrow K_{(s)}$
B
$Mg^{2+}+2e^-\rightarrow Mg_{(s)}$
C
$Fe^{2+}+2e^-\rightarrow Fe_{(s)}$
D
$Au^{3+}+3e^-\rightarrow Au_{(s)}$
Detailed Solution
In the electrochemical (EMF) series, elements are arranged in order of increasing standard reduction potential. Gold ($Au^{3+}/Au$) has the highest (most positive) standard reduction potential among the given options, placing it at the top of the series.