At 298 K , the standard electrode potentials of Cu^2+/Cu, Zn^2+/Zn, Fe^2+/Fe and Ag^+/Ag are 0.34 V, -0.76 V, -0.44 V and 0.80 V , respectively. On th - Chemistry MCQ NEET 2022 2026 | ExamTest.live

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At 298 K, the standard electrode potentials of Cu^{2 +} / Cu, Zn^{2 +} / Zn, Fe^{2 +} / Fe and Ag^{+} / Ag are 0.34 V, - 0.76 V, - 0.44 V and 0.80 V, respectively. On the basis of standard electrode potential, predict which of the following reaction cannot occur?

Solution & Step-by-step Explanation

A reaction occurs if the E_{ce ll}^{\circ} > 0 . Metals with more negative reduction potentials (stronger reducing agents) can displace metals with more positive reduction potentials.Reduction Potentials (V): Zn (- 0.76) < Fe (- 0.44) < Cu (+ 0.34) < Ag (+ 0.80) .Zn can displace Cu.Fe can displace Cu.Zn can displace Fe.Ag cannot displace Cu because Silver (+ 0.80 V) is a weaker reducing agent than Copper (+ 0.34 V).

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At 298 K, the standard electrode potentials of Cu^{2 +} / Cu, Zn^{2 +} / Zn, Fe^{2 +} / Fe and Ag^{+} / Ag are 0.34 V, - 0.76 V, - 0.44 V and 0.80 V, respectively. On the basis of standard electrode potential, predict which of the following reaction cannot occur?

CuSO_{4} (a q) + Zn (s) \to ZnSO_{4} (a q) + Cu (s)

CuSO_{4} (a q) + Fe (s) \to FeSO_{4} (a q) + Cu (s)

FeSO_{4} (a q) + Zn (s) \to ZnSO_{4} (a q) + Fe (s)

2 CuSO_{4} (a q) + 2 Ag (s) \to 2 Cu (s) + Ag_{2} SO_{4} (a q)

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