NEET UG · Chemistry · Electrochemistry

Nernst Equation: NEET previous year questions

9 questions in ten years of NEET, in 7 of 10 papers. Pattern: Every year. Here is how it is asked and which ideas come back.

Asked in 10 years: 9; about 0.9 per paper
Years asked: 7/10; last asked 2026
Chance of a question next paper: 64%; historical rate, how we compute it
Weighted estimate: 0.8; model; history: 0.9 a paper on average, typically 0–2

Key findings

01
Asked in 7 of 10 papers, 9 questions in all: #94 of 204 topics by ten-year total. It comes back every 1.5 years on average.
02
63% of its questions since 2018 tested an idea never asked before; none repeated an idea from the year before.
03
The most repeated idea is Full Cell Potential Calculation, asked 3 times (2017, 2022), usually as “predict feasibility from standard potentials”.
04
NEET has asked 6 of the 82 ideas in this topic; 73 have never been asked, directly or indirectly.
05
Mostly asked as numerical (44%); 33% easy, 0% hard, and down from 1.0 to 0.6 questions a paper since 2024.

Questions per year

Up to 2023: 1.0; per paper
Since 2024: 0.6; -0.3
Usual gap: 1.5 yrs; between papers asking it
Swing: ±0.7; questions, year to year

How it is asked

Difficulty, format and skill

Across all 9 questions on Nernst Equation since 2017.

Difficulty

QUESTIONS

Easy3 · 33%
Medium6 · 67%
Hard0 · 0%

Format

Numerical · 4 Q44%
One-line MCQ · 2 Q22%
Match the lists · 1 Q11%
Assertion–reason · 1 Q11%
Figure-based · 1 Q11%

Skill tested

Calculation · 4 Q44%
Concept · 2 Q22%
Multi-step · 1 Q11%
Application · 1 Q11%
Data or graph · 1 Q11%

Repeats

New idea, or one asked before?

Each column is a paper. Blue questions tested an idea NEET had not asked before; navy ones went back to an idea from an earlier paper. 2017 is the first paper, so everything in it counts as new.

’17’18’19’20’21’22’23’24’25’26

Idea asked for the first time
Idea asked in an earlier paper

Coverage of the topic

NEET has asked 6 of the 82 ideas in this topic. 73 have never been asked yet.

Asked directly6 · 7%
Touched inside another question3 · 4%
Never asked73 · 89%

Ideas come from Lumi’s syllabus map of NCERT. A never-asked idea is not a safe skip: most new questions come from exactly these.

Drill down

Idea, year, question

Every idea NEET tested in this topic, with its ten papers. Open one to read the questions.

ideaAskedShareYears’17’18’19’20’21’22’23’24’25’26

Repeated3 · 33%33%2/102
- 2022 · Q53
  Given below are half cell reactions : $\mathrm{MnO_4^- + 8H^+ + 5e^- \to Mn^{2+} + 4H_2O}$ , $E^\circ_{\mathrm{Mn^{2+}/MnO_4^-}} = -1.510$ …
  easyNumerical
- 2022 · Q80
  At 298 K, the standard electrode potentials of $\mathrm{Cu^{2+}/Cu}$ , $\mathrm{Zn^{2+}/Zn}$ , $\mathrm{Fe^{2+}/Fe}$ and $\mathrm{Ag^+/Ag}$ …
  easyOne-line MCQ
- 2017 · Q63
  In the electrochemical cell : Zn| $\mathrm{ZnSO_4}$ (0.01 M)|| $\mathrm{CuSO_4}$ (1.0 M)|Cu, the emf of this Daniel cell is $E_1$ . When the…
  mediumOne-line MCQNew idea
Repeated2 · 22%22%2/10
1 · 11%11%1/10
1 · 11%11%1/10
1 · 11%11%1/10
1 · 11%11%1/10

Squares are the ten papers, 2017 to 2026; darker means more questions. Share is of the level above.

Ideas

Every idea inside this topic

6 different ideas were tested; 2 came more than once. Full Cell Potential Calculation is the foundation for 36 other ideas in the syllabus.

Full Cell Potential Calculation3×
predict feasibility from standard potentials
One-line MCQ · 6% next · foundation for 36
Gibbs Free Energy and EMF2×
assertion-reason on electrochemical thermodynamics
Assertion–reason · 6% next · foundation for 11
Non-Additivity of E-standard in Half-Reactions1×
numerical
Numerical · 6% next
Determining Electron Transfer Number (n)1×
match list on conversions and faradays
Match the lists · 6% next
Cell Potential and Equilibrium1×
numerical
Numerical · 4% next · foundation for 7
Spontaneity of Disproportionation Reactions1×
identify disproportionating species from potentials
Figure-based · 4% next

Idea	Times	Format	Chance next	Foundation for
Full Cell Potential Calculationpredict feasibility from standard potentials	3	One-line MCQApplication	6%	36 ideas
Gibbs Free Energy and EMFassertion-reason on electrochemical thermodynamics	2	Assertion–reasonCalculation	6%	11 ideas
Non-Additivity of E-standard in Half-Reactionsnumerical	1	NumericalCalculation	6%	–
Determining Electron Transfer Number (n)match list on conversions and faradays	1	Match the listsMulti-step	6%	–
Cell Potential and Equilibriumnumerical	1	NumericalCalculation	4%	7 ideas
Spontaneity of Disproportionation Reactionsidentify disproportionating species from potentials	1	Figure-basedData or graph	4%	–

Chance next is the historical rate at which an idea with this record came back in the following paper. It is low for every idea, which is why learning the topic beats memorising past questions. All repeated ideas

Every question

Nernst Equation questions, year by year

The opening words of each question as it appeared in the official paper, with the idea it tested.

NEET 20261 question

Q56
The standard electrode potential (E $^\circ$ ) for the half-cell reaction $\mathrm{Fe^{3+}+e^-\to Fe^{2+}}$ at 298 K is (Given :…
Idea: Non-Additivity of E-standard in Half-Reactions
New ideaMediumNumerical

NEET 20241 question

Q85
Match List I with List II. List I (Conversion) | List II (Number of Faraday required) A. 1 mol of H $_2$ O to O $_2$ | I. 3F B. 1 mol of…
Idea: Determining Electron Transfer Number (n)
New ideaMediumMatch the lists

NEET 20231 question

Q76
Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R : Assertion A : In equation…
Idea: Gibbs Free Energy and EMF
MediumAssertion–reason

NEET 20222 questions

Q53
Given below are half cell reactions : $\mathrm{MnO_4^- + 8H^+ + 5e^- \to Mn^{2+} + 4H_2O}$ , $E^\circ_{\mathrm{Mn^{2+}/MnO_4^-}} = -1.510$ …
Idea: Full Cell Potential Calculation
EasyNumerical
Q80
At 298 K, the standard electrode potentials of $\mathrm{Cu^{2+}/Cu}$ , $\mathrm{Zn^{2+}/Zn}$ , $\mathrm{Fe^{2+}/Fe}$ and $\mathrm{Ag^+/Ag}$ …
Idea: Full Cell Potential Calculation
EasyOne-line MCQ

NEET 20192 questions

Q53
For the cell reaction $2Fe^{3+}(aq) + 2I^-(aq) \to 2Fe^{2+}(aq) + I_2(aq)$ $E^\ominus_{cell} = 0.24$ V at 298 K. The standard Gibbs energy…
Idea: Gibbs Free Energy and EMF
New ideaEasyNumerical
Q82
For a cell involving one electron $E^\ominus_{cell} = 0.59$ V at 298 K, the equilibrium constant for the cell reaction is : [Given that…
Idea: Cell Potential and Equilibrium
New ideaMediumNumerical

NEET 20181 question

Q81
Consider the change in oxidation state of Bromine corresponding to different emf values as shown in the diagram below :…
Idea: Spontaneity of Disproportionation Reactions
New ideaMediumFigure-based · figure

NEET 20171 question

Q63
In the electrochemical cell : Zn| $\mathrm{ZnSO_4}$ (0.01 M)|| $\mathrm{CuSO_4}$ (1.0 M)|Cu, the emf of this Daniel cell is $E_1$ . When the…
Idea: Full Cell Potential Calculation
MediumOne-line MCQ

Questions from the official NEET UG papers published by NTA (CBSE before 2019). Topic and idea tags, counts and notes are Lumi’s.