NEET UG · Chemistry · Equilibrium

Chemical Equilibrium: NEET previous year questions

11 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: 11; about 1.1 per paper
Years asked: 7/10; last asked 2025
Chance of a question next paper: 64%; historical rate, how we compute it
Weighted estimate: 1.1; model; history: 1.1 a paper on average, typically 0–2

Key findings

01
Asked in 7 of 10 papers, 11 questions in all: #63 of 204 topics by ten-year total. It comes back every 1.3 years on average. Last asked in 2025.
02
89% 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 Standard Gibbs Free Energy and Equilibrium Constant, asked 2 times (2020, 2023), usually as “relation of standard gibbs energy and k”.
04
NEET has asked 10 of the 89 ideas in this topic; 75 have never been asked, directly or indirectly.
05
Mostly asked as numerical (64%); 55% easy, 9% hard, and up from 0.8 to 1.6 questions a paper since 2024.

Questions per year

Up to 2023: 0.8; per paper
Since 2024: 1.6; +0.7
Usual gap: 1.3 yrs; between papers asking it
Swing: ±0.9; questions, year to year

How it is asked

Difficulty, format and skill

Across all 11 questions on Chemical Equilibrium since 2017.

Difficulty

QUESTIONS

641

Easy6 · 55%
Medium4 · 36%
Hard1 · 9%

Format

Numerical · 7 Q64%
One-line MCQ · 3 Q27%
Other · 1 Q9%

Skill tested

Application · 4 Q36%
Calculation · 4 Q36%
Multi-step · 3 Q27%

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 10 of the 89 ideas in this topic. 75 have never been asked yet.

1075

Asked directly10 · 11%
Touched inside another question4 · 4%
Never asked75 · 84%

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

Repeated2 · 18%18%2/10
- 2023 · Q99
  The equilibrium concentrations of the species in the reaction $\mathrm{A+B\rightleftharpoons C+D}$ are 2, 3, 10 and 6 mol L $^{-1}$ ,…
  mediumNumerical
- 2020 · Q94
  Hydrolysis of sucrose is given by the following reaction. Sucrose + $\mathrm{H_2O \rightleftharpoons}$ Glucose + Fructose If the…
  easyNumericalNew idea
1 · 9%9%1/10
1 · 9%9%1/10
1 · 9%9%1/10
1 · 9%9%1/10
1 · 9%9%1/10
1 · 9%9%1/10
1 · 9%9%1/10
1 · 9%9%1/10
1 · 9%9%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

10 different ideas were tested; 1 came more than once. Le Chatelier: Concentration and Pressure is the foundation for 25 other ideas in the syllabus.

Standard Gibbs Free Energy and Equilibrium Constant2×
relation of standard gibbs energy and k
Numerical · 6% next · foundation for 5
Equilibrium and Rate Constants1×
numerical
Numerical · 6% next · foundation for 1
Le Chatelier: Temperature Effect1×
conditions for higher yield by le chatelier
Other · 6% next · foundation for 10
Degree of Dissociation and Equilibrium Constant1×
numerical
Numerical · 6% next · foundation for 10
Reaction Quotient and Direction1×
numerical
Numerical · 6% next · foundation for 4
Relationship Between Kp and Kc1×
identify reaction where condition holds
One-line MCQ · 6% next · foundation for 2
Equilibrium Concentration Calculations1×
numerical
Numerical · 4% next · foundation for 16
Le Chatelier: Concentration and Pressure1×
conditions favouring product formation
One-line MCQ · 4% next · foundation for 25
Kp for Solid Thermal Decomposition1×
numerical
Numerical · 4% next
Manipulation of Equilibrium Constant1×
numerical
One-line MCQ · 4% next · foundation for 1

Idea	Times	Format	Chance next	Foundation for
Standard Gibbs Free Energy and Equilibrium Constantrelation of standard gibbs energy and k	2	NumericalApplication	6%	5 ideas
Equilibrium and Rate Constantsnumerical	1	NumericalMulti-step	6%	1 ideas
Le Chatelier: Temperature Effectconditions for higher yield by le chatelier	1	OtherApplication	6%	10 ideas
Degree of Dissociation and Equilibrium Constantnumerical	1	NumericalMulti-step	6%	10 ideas
Reaction Quotient and Directionnumerical	1	NumericalCalculation	6%	4 ideas
Relationship Between Kp and Kcidentify reaction where condition holds	1	One-line MCQApplication	6%	2 ideas
Equilibrium Concentration Calculationsnumerical	1	NumericalCalculation	4%	16 ideas
Le Chatelier: Concentration and Pressureconditions favouring product formation	1	One-line MCQApplication	4%	25 ideas
Kp for Solid Thermal Decompositionnumerical	1	NumericalMulti-step	4%	–
Manipulation of Equilibrium Constantnumerical	1	One-line MCQCalculation	4%	1 ideas

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

Chemical Equilibrium questions, year by year

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

NEET 20252 questions

Q73
For the reaction $A(g) \rightleftharpoons 2B(g)$ , the backward reaction rate constant is higher than the forward reaction rate constant by…
Idea: Equilibrium and Rate Constants
New ideaMediumNumerical
Q88
Higher yield of NO in $N_2(g) + O_2(g) \rightleftharpoons 2NO(g)$ can be obtained at [ΔH of the reaction = + 180.7 kJ mol $^{-1}$ ] A.…
Idea: Le Chatelier: Temperature Effect
New ideaEasyOther

NEET 20243 questions

Q64
For the reaction 2A $\rightleftharpoons$ B + C, K $_c$ = $4\times10^{-3}$ . At a given time, the composition of reaction mixture is : [A] =…
Idea: Reaction Quotient and Direction
New ideaEasyNumerical
Q74
In which of the following equilibria, K $_p$ and K $_c$ are NOT equal?
Idea: Relationship Between Kp and Kc
New ideaEasyOne-line MCQ
Q95
Consider the following reaction in a sealed vessel at equilibrium with concentrations of N $_2$ = $3.0\times10^{-3}$ M, O $_2$ =…
Idea: Degree of Dissociation and Equilibrium Constant
New ideaHardNumerical

NEET 20231 question

Q99
The equilibrium concentrations of the species in the reaction $\mathrm{A+B\rightleftharpoons C+D}$ are 2, 3, 10 and 6 mol L $^{-1}$ ,…
Idea: Standard Gibbs Free Energy and Equilibrium Constant
MediumNumerical

NEET 20221 question

Q93
$\mathrm{3O_2(g) \rightleftharpoons 2O_3(g)}$ for the above reaction at 298 K, $K_c$ is found to be $3.0\times10^{-59}$ . If the…
Idea: Equilibrium Concentration Calculations
New ideaMediumNumerical

NEET 20201 question

Q94
Hydrolysis of sucrose is given by the following reaction. Sucrose + $\mathrm{H_2O \rightleftharpoons}$ Glucose + Fructose If the…
Idea: Standard Gibbs Free Energy and Equilibrium Constant
New ideaEasyNumerical

NEET 20181 question

Q83
Which one of the following conditions will favour maximum formation of the product in the reaction,…
Idea: Le Chatelier: Concentration and Pressure
New ideaEasyOne-line MCQ

NEET 20172 questions

Q69
A 20 litre container at 400 K contains $\mathrm{CO_2(g)}$ at pressure 0.4 atm and an excess of SrO (neglect the volume of solid SrO). The…
Idea: Kp for Solid Thermal Decomposition
MediumNumerical
Q86
The equilibrium constants of the following are : $\mathrm{N_2 + 3H_2 \rightleftharpoons 2NH_3}$ $K_1$ …
Idea: Manipulation of Equilibrium Constant
EasyOne-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.