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Friday, 9 October

NEET UG 2022 · Chemistry · Question 80

NEET 2022 Chemistry, question 80

Question 80 of the NEET 2022 paper (code R1) is a Chemistry question from Electrochemistry. Its idea, Full Cell Potential Calculation, was asked 3 times, in 2017 and 2022, across NEET 2017–2026. The NTA final answer key gives option 1.

Updated 2026-10-08

Q80 · Chemistry

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 reaction can not occur ?

  1. 12CuSO4(aq)+2Ag(s)→2Cu(s)+Ag2SO4(aq)\mathrm{2CuSO_4(aq) + 2Ag(s) \to 2Cu(s) + Ag_2SO_4(aq)}Official answer
  2. 2CuSO4(aq)+Zn(s)→ZnSO4(aq)+Cu(s)\mathrm{CuSO_4(aq) + Zn(s) \to ZnSO_4(aq) + Cu(s)}
  3. 3CuSO4(aq)+Fe(s)→FeSO4(aq)+Cu(s)\mathrm{CuSO_4(aq) + Fe(s) \to FeSO_4(aq) + Cu(s)}
  4. 4FeSO4(aq)+Zn(s)→ZnSO4(aq)+Fe(s)\mathrm{FeSO_4(aq) + Zn(s) \to ZnSO_4(aq) + Fe(s)}

Official answer: option 1 · NTA final answer key

Same idea

Full Cell Potential Calculation, in other papers

NEET asked this idea 3 times, in 2017 and 2022. The other 2 questions below.

  • 2022 Q53Given below are half cell reactions : MnO4−+8H++5e−→Mn2++4H2O\mathrm{MnO_4^- + 8H^+ + 5e^- \to Mn^{2+} + 4H_2O}, EMn2+/MnO4−∘=−1.510E^\circ_{\mathrm{Mn^{2+}/MnO_4^-}} = -1.510…Numerical · Easy
  • 2017 Q63In the electrochemical cell : Zn|ZnSO4\mathrm{ZnSO_4} (0.01 M)||CuSO4\mathrm{CuSO_4} (1.0 M)|Cu, the emf of this Daniel cell is E1E_1. When the…One-line MCQ · Medium

Full Cell Potential Calculation: every question and how it was framed

The chapter

Electrochemistry in ten years of NEET

17 questions from 2017–2026, asked in 10 of 10 papers, about 1.6 a paper. Nernst Equation alone had 9.

Chapter analysisStudy this chapterPractise this chapter

Electrochemistry: questions per paper

0241’171’182’192’202’212’222’232’241’252’26