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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.

(1) K+ + 1e → K(s)

(2) Mg2+ + 2e → Mg(s)

(3) Fe2+ + 2e → Fe(s)

(4) Au3+ + 3e → Au(s)

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