Identify the reaction from following having top position in EMF series (Std. red. potential) according to their electrode potential at 298 K.
(1) K+ + 1e– → K(s)
(2) Mg2+ + 2e– → Mg(s)
(3) Fe2+ + 2e– → Fe(s)
(4) Au3+ + 3e– → Au(s)
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