NEET UG · Chemistry · Class 11

Equilibrium: NEET previous year questions

26 questions in ten years of NEET, asked in 10 of 10 years. Here is what this chapter tests and how.

Asked in 10 years: 26; 10 of 10 papers
10-year average: 2.5; a paper · 3.2 since 2024 +0.9
Typical range: 1–4; questions a paper; fewest 1, most 5
Weighted estimate: 2.7; model, recent papers count more · about 11 marks

Typical range (fact)
10-year average (fact)
Weighted estimate (model)

Typical range: questions per paper in the middle eight of the ten papers, leaving out the single highest and lowest year (about the 10th to 90th percentile), each paper scaled to 180 questions. The ten-year average and the range are historical fact. The weighted estimate is a model: each paper's share, with recent papers counting more (half-life three years), and dropped syllabus removed. It is a guide to effort, not a forecast.

What to do

How to spend time on Equilibrium

Priority

Must do

Among the chapters that held the first half of all NEET questions in ten years. How bands are set

Past questions: 26in 10 of 10 papers
Study plan gives it: 18 hover 12 months; 14 h over 6

Study this chapter →Practise →

Ideas asked most often

Group Separation of Cations2×
Standard Gibbs Free Energy and Equilibrium Constant2×
Solubility Product from Solubility2×

154 of the 180 ideas in Lumi’s map of this chapter have not been asked or touched in ten years. New questions often come from ideas like these, so learn the whole chapter, not just the list above.

Questions per year

Kind of question

SHARE OF 10 YEARS

Calculation62%
Application15%
Recall12%
Concept8%
Match the lists4%

Most common asks: numerical (14); conditions favouring product formation (1); relation of standard gibbs energy and k (1).

Profile

This chapter in numbers

Where it ranks, how steady it is, and what it costs to study.

Rank, all NEET chapters: #23; of 80 by weighted estimate
Rank in Chemistry: #5; of 21 chapters
Share of the paper: 1.4%; ten-year average
Busiest year: 2024; 5 questions
Year to year: Some swing; varies by about 1.1 questions
Long-run direction: -0.02; questions per paper, per year
Easy questions: 50%; 68% of ideas rated hard
With a figure: 4%; graph, diagram or structure
Study time: 18 h; 14 h on a 6-month plan
Marks per study hour: 0.60; #29 of 80 chapters
Foundation for others: 39%; of its ideas are used in other chapters

Difficulty, year by year

Each question rated easy, medium or hard against NCERT.

20173
20183
20193
20202
20211
20222
20232
20245
20254
20261

Easy
Medium
Hard

What it asks you to do

SHARE OF QUESTIONS

Calculation46%
Application19%
Recall15%
Multi-step12%
Concept8%

Coverage

How much of the chapter NEET has used

We split the chapter into 180 ideas. In ten years NEET built a question around 18 of them. Most of the chapter has never been asked, which is why learning it whole beats memorising past questions.

Asked as the main idea: 18
Touched on in a question: 8
Never asked: 154

Topics

What repeats, topic by topic

Questions per topic in each year's paper. Topics that come every year are worth learning first.

pH and Buffer Solutions · Every year13
1231111111
Chemical Equilibrium · Every year11
2111132
Qualitative Inorganic Analysis · New since 20242
11

’17’18’19’20’21’22’23’24’25’26

Topic	2017	’18	2019	’20	2021	’22	2023	’24	2025	’26	Total
pH and Buffer SolutionsEvery year	1	2	3	1	1	1	1	1	1	1	13
Chemical EquilibriumEvery year	2	1	·	1	·	1	1	3	2	·	11
Qualitative Inorganic AnalysisNew since 2024	·	·	·	·	·	·	·	1	1	·	2

03+questions in that year’s paper

Drill down

Topic, idea, question

Open a topic to see every idea NEET tested inside it, then open an idea to read the questions. Each row shows its ten papers.

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

Open13 · 50%50%10/1023
12 ideas inside
- Repeated2 · 15%15%2/10
- 1 · 8%8%1/10
- 1 · 8%8%1/10
- 1 · 8%8%1/10
- 1 · 8%8%1/10
- 1 · 8%8%1/10
- 1 · 8%8%1/10
- 1 · 8%8%1/10
- 1 · 8%8%1/10
- 1 · 8%8%1/10
- 1 · 8%8%1/10
- 1 · 8%8%1/10
Open11 · 42%42%7/10232
Open2 · 8%8%2/10

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

Ideas

The exact ideas NEET has asked

Inside the topics, 23 different ideas were tested. These came more than once, or are new since 2024.

Group Separation of CationsNew2×
order of groups in qualitative analysis
Standard Gibbs Free Energy and Equilibrium Constant2×
relation of standard gibbs energy and k
Solubility Product from Solubility2×
numerical
Solubility from KspNew1×
order/ranking of solubility from ksp
Le Chatelier: Temperature EffectNew1×
conditions for higher yield by le chatelier
Equilibrium and Rate ConstantsNew1×
numerical
pH of Polyprotic AcidsNew1×
count correct statements on polyprotic acid
Degree of Dissociation and Equilibrium ConstantNew1×
numerical
Relationship Between Kp and KcNew1×
identify reaction where condition holds
Reaction Quotient and DirectionNew1×
numerical
pH of Salt SolutionsNew1×
identify reagent to suppress a process

Idea	Times	Usually asked as
Group Separation of Cationsorder of groups in qualitative analysis	2	Match the listsNew
Standard Gibbs Free Energy and Equilibrium Constantrelation of standard gibbs energy and k	2	Numerical
Solubility Product from Solubilitynumerical	2	Numerical
Solubility from Ksporder/ranking of solubility from ksp	1	One-line MCQNew
Le Chatelier: Temperature Effectconditions for higher yield by le chatelier	1	OtherNew
Equilibrium and Rate Constantsnumerical	1	NumericalNew
pH of Polyprotic Acidscount correct statements on polyprotic acid	1	OtherNew
Degree of Dissociation and Equilibrium Constantnumerical	1	NumericalNew
Relationship Between Kp and Kcidentify reaction where condition holds	1	One-line MCQNew
Reaction Quotient and Directionnumerical	1	NumericalNew
pH of Salt Solutionsidentify reagent to suppress a process	1	One-line MCQNew

Every question

Equilibrium questions, year by year

The opening words of each question as it appeared in the official paper.

NEET 20261 question

Q52The correct order of solubility of the given salts in water at 298 K is Salt | $K_{sp}$ at 298 K AgBr | $5.0\times10^{-13}$ …One-line MCQ · figure

NEET 20254 questions

Q48Match List I with List II List I (Ion) | List II (Group Number in Cation Analysis) A. $Co^{2+}$ | I. Group-I B. $Mg^{2+}$ | II. Group-III…Match the lists
Q59Phosphoric acid ionizes in three steps with their ionization constant values $K_{a_1}$ , $K_{a_2}$ and $K_{a_3}$ , respectively, while K is…Other
Q73For the reaction $A(g) \rightleftharpoons 2B(g)$ , the backward reaction rate constant is higher than the forward reaction rate constant by…Numerical
Q88Higher 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.…Other

NEET 20245 questions

Q64For the reaction 2A $\rightleftharpoons$ B + C, K $_c$ = $4\times10^{-3}$ . At a given time, the composition of reaction mixture is : [A] =…Numerical
Q74In which of the following equilibria, K $_p$ and K $_c$ are NOT equal?One-line MCQ
Q89Given below are certain cations. Using inorganic qualitative analysis, arrange them in increasing group number from 0 to VI. A. Al $^{3+}$ …Other
Q93During the preparation of Mohr's salt solution (Ferrous ammonium sulphate), which of the following acid is added to prevent hydrolysis of…One-line MCQ
Q95Consider the following reaction in a sealed vessel at equilibrium with concentrations of N $_2$ = $3.0\times10^{-3}$ M, O $_2$ =…Numerical

NEET 20232 questions

Q83Amongst the given options which of the following molecules / ion acts as a Lewis acid?One-line MCQ
Q99The equilibrium concentrations of the species in the reaction $\mathrm{A+B\rightleftharpoons C+D}$ are 2, 3, 10 and 6 mol L $^{-1}$ ,…Numerical

NEET 20222 questions

Q56The pH of the solution containing 50 mL each of 0.10 M sodium acetate and 0.01 M acetic acid is [Given p $K_a$ of $\mathrm{CH_3COOH}$ = 4.57]Numerical
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…Numerical

NEET 20211 question

Q54The $\mathrm{pK_b}$ of dimethylamine and $\mathrm{pK_a}$ of acetic acid are 3.27 and 4.77 respectively at T (K). The correct option for…Numerical

NEET 20202 questions

Q92Find out the solubility of $\mathrm{Ni(OH)_2}$ in 0.1 M NaOH. Given that the ionic product of $\mathrm{Ni(OH)_2}$ is $2\times10^{-15}$ .Numerical
Q94Hydrolysis of sucrose is given by the following reaction. Sucrose + $\mathrm{H_2O \rightleftharpoons}$ Glucose + Fructose If the…Numerical

NEET 20193 questions

Q62pH of a saturated solution of $Ca(OH)_2$ is 9. The solubility product $(K_{sp})$ of $Ca(OH)_2$ is :Numerical
Q71Conjugate base for Brönsted acids $H_2O$ and HF are :One-line MCQ
Q77Which will make basic buffer ?One-line MCQ

NEET 20183 questions

Q74Following solutions were prepared by mixing different volumes of NaOH and HCl of different concentrations : a. 60 mL $\frac{M}{10}$ HCl +…Numerical
Q77The solubility of $\mathrm{BaSO_4}$ in water is $2.42\times10^{-3}$ gL $^{-1}$ at 298 K. The value of its solubility product ( $K_{sp}$ )…Numerical
Q83Which one of the following conditions will favour maximum formation of the product in the reaction,…One-line MCQ

NEET 20173 questions

Q51Concentration of the $\mathrm{Ag^+}$ ions in a saturated solution of $\mathrm{Ag_2C_2O_4}$ is $2.2\times10^{-4}$ mol $\mathrm{L^{-1}}$ .…Numerical
Q69A 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…Numerical
Q86The equilibrium constants of the following are : $\mathrm{N_2 + 3H_2 \rightleftharpoons 2NH_3}$ $K_1$ …One-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.

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