Verified Solution • 2025–26 Session moderate

QNEET-2022-Ch-401: NEET 2022 Chemistry - Class 12 NEET-2022-Ch-401 Solution: At 298 K the standard electrode potentials of \(Cu^{2+}/Cu\)…

At 298 K the standard electrode potentials of Cu2+/CuCu^{2+}/Cu Zn2+/ZnZn^{2+}/Zn Fe2+/FeFe^{2+}/Fe and Ag+/AgAg^+/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? CuSO4(aq)+Zn(s)→ZnSO4(aq)+Cu(s)CuSO_4(aq) + Zn(s) \rightarrow ZnSO_4(aq) + Cu(s) CuSO4(aq)+Fe(s)→FeSO4(aq)+Cu(s)CuSO_4(aq) + Fe(s) \rightarrow FeSO_4(aq) + Cu(s) FeSO4(aq)+Zn(s)→ZnSO4(aq)+Fe(s)FeSO_4(aq) + Zn(s) \rightarrow ZnSO_4(aq) + Fe(s) 2CuSO4(aq)+2Ag(s)→2Cu(s)+Ag2SO4(aq)2CuSO_4(aq) + 2Ag(s) \rightarrow 2Cu(s) + Ag_2SO_4(aq)

Multiple Choice Options

  • A CuSO 4 (aq) + Zn(s) →\to _ ZnSO 4 (aq) + Cu(s)
  • B CuSO 4 (aq) + Fe(s) →\to _ FeSO 4 (aq) + Cu(s)
  • C FeSO 4 (aq) + Zn(s) →\to _ ZnSO 4 (aq) + Fe(s)
  • D 2CuSO 4 (aq) + 2Ag(s) →\to _ 2Cu(s) + Ag 2 SO 4 (aq)

Step-by-Step Verified Solution

For a reaction to be spontaneous, E c e l l o must be positive. _ For, FeSO 4 (aq) + Zn(s) _ ZnSO 4 (aq) + Fe(s) E c e l l o = E c a t h o d e o _ E a n o d e o = _ 0.44 V _ ( _ 0.76 V) = 0.32 V _ For, 2CuSO 4 (aq) + 2Ag(s) _ 2Cu(s) + Ag 2 SO 4 (aq) E c e l l o = 0.34 V _ 0.80 V = _ 0.46 V _ For, CuSO 4 (aq) + Zn(s) _ ZnSO 4 (aq) + Cu(s) E c e l l o = 0.34 V _ ( _ 0.76 V) = 1.1 V _ For, CuSO 4 (aq) + Fe(s) _ FeSO 4 (aq) + Cu(s) E c e l l o = 0.80 V _ ( _ 0.44 V) = 1.24 V

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