At 298K, 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 can not occur?

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${CuSO}_{4} (aq) + Fe (s) \to {FeSO}_{4} (aq) + Cu (s)$

${CuSO}_{4} (aq) + Zn (s) \to {ZnSO}_{4} (aq) + Cu (s)$

$2 {CuSO}_{4} (aq) + 2 Ag (s) \to 2 Cu (s) + {Ag}_{2} {SO}_{4} (aq)$

${FeSO}_{4} (aq) + Zn (s) \to {ZnSO}_{4} (aq) + Fe (s)$

answer is C.

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Detailed Solution

‘Ag’ has high S.R.P, So it oxidises by ‘Cu’ but not reduced.

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