At 298 K, the standard electrode potentials of Cu2+ / Cu, Zn2+ / Zn, Fe2+ / Fe and Ag+ / Ag are 0.34 V, $-$0.76 V, $-$0.44 V V and 0.80 V, respectively. On the basis of standard electrode potential, predict which of the following reaction cannot occur?

Question

At 298 K, the standard electrode potentials of Cu²⁺ / Cu, Zn²⁺ / Zn, Fe²⁺ / Fe and Ag⁺ / Ag are 0.34 V, $-$0.76 V, $-$0.44 V V and 0.80 V, respectively.

On the basis of standard electrode potential, predict which of the following reaction cannot occur?

CuSO₄(aq) + Zn(s) $\to$ ZnSO₄(aq) + Cu(s)

CuSO₄(aq) + Fe(s) $\to$ FeSO₄(aq) + Cu(s)

FeSO₄(aq) + Zn(s) $\to$ ZnSO₄(aq) + Fe(s)

2CuSO₄(aq) + 2Ag(s) $\to$ 2Cu(s) + Ag₂SO₄(aq)

Solution

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