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ChemistryNEET 2022Electrochemical cells and Nernst equation

Electrochemistry

At 298 K, the standard electrode potentials of Cu2+/Cu\mathrm{Cu^{2+}/Cu}, Zn2+/Zn\mathrm{Zn^{2+}/Zn}, Fe2+/Fe\mathrm{Fe^{2+}/Fe} and Ag+/Ag\mathrm{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 reactions cannot occur:

  1. A.2CuSO4(aq)+2Ag(s)→2Cu(s)+Ag2SO4(aq)\mathrm{2CuSO_4(aq) + 2Ag(s) \rightarrow 2Cu(s) + Ag_2SO_4(aq)}✓
  2. B.CuSO4(aq)+Zn(s)→ZnSO4(aq)+Cu(s)\mathrm{CuSO_4(aq) + Zn(s) \rightarrow ZnSO_4(aq) + Cu(s)}
  3. C.CuSO4(aq)+Fe(s)→FeSO4(aq)+Cu(s)\mathrm{CuSO_4(aq) + Fe(s) \rightarrow FeSO_4(aq) + Cu(s)}
  4. D.FeSO4(aq)+Zn(s)→ZnSO4(aq)+Fe(s)\mathrm{FeSO_4(aq) + Zn(s) \rightarrow ZnSO_4(aq) + Fe(s)}

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