NEET UG · Chemistry · States of Matter

Ideal Gas Law: NEET previous year questions

This topic’s chapter, States of Matter, is not in the NEET UG 2026 syllabus. It had 10 questions from 2017 to 2023; they are kept here for reference.

Asked in 10 years: 10; about 0.9 per paper
Years asked: 6/10; last asked 2023
Syllabus: Dropped; not in NEET UG 2026
Last asked: 2023; 3 papers ago

Key findings

01
Asked in 6 of 10 papers, 10 questions in all: #84 of 204 topics by ten-year total. Last asked in 2023.
02
80% of its questions since 2018 tested an idea never asked before; 1 repeated an idea from the year before.
03
The most repeated idea is Dalton's Law of Partial Pressures, asked 2 times (2020, 2022), usually as “numerical”.
04
NEET has asked 4 of the 81 ideas in this topic; 67 have never been asked, directly or indirectly.
05
Mostly asked as one-line MCQ (40%); 60% easy, 0% hard, and down from 1.4 to 0.0 questions a paper since 2024.

Questions per year

Up to 2023: 1.4; per paper
Since 2024: 0.0; -1.4
Usual gap: 1.0 yrs; between papers asking it
Swing: ±0.8; questions, year to year

How it is asked

Difficulty, format and skill

Across all 10 questions on Ideal Gas Law since 2017.

Difficulty

QUESTIONS

Easy6 · 60%
Medium4 · 40%
Hard0 · 0%

Format

One-line MCQ · 4 Q40%
Numerical · 3 Q30%
Figure-based · 2 Q20%
Other · 1 Q10%

Skill tested

Concept · 3 Q30%
Recall · 2 Q20%
Data or graph · 2 Q20%
Calculation · 2 Q20%
Multi-step · 1 Q10%

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 4 of the 81 ideas in this topic. 67 have never been asked yet.

1067

Asked directly4 · 5%
Touched inside another question10 · 12%
Never asked67 · 83%

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 · 20%20%2/10
- 2022 · Q60
  Which one is not correct mathematical equation for Dalton's Law of partial pressure ? Here p = total pressure of gaseous mixture
  mediumOne-line MCQ
- 2020 · Q110
  A mixture of $\mathrm{N_2}$ and Ar gases in a cylinder contains 7 g of $\mathrm{N_2}$ and 8 g of Ar. If the total pressure of the mixture…
  easyNumericalNew idea
Repeated2 · 20%20%2/10
2 · 20%20%1/102
1 · 10%10%1/10
1 · 10%10%1/10
1 · 10%10%1/10
1 · 10%10%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

7 different ideas were tested; 3 came more than once. Ideal Gas Equation is the foundation for 21 other ideas in the syllabus.

Dalton's Law of Partial Pressures2×
numerical
Numerical · 4% next · foundation for 7
Ideal Gas Equation2×
numerical
Numerical · 4% next · foundation for 21
van der Waals Equation2×
compare liquefaction using van der waals a
One-line MCQ · 4% next
Boyle's Law Isotherm Graphs1×
graph interpretation of gas law
Figure-based · 4% next
Types of Intermolecular Forces1×
count correct statements on intermolecular forces
Other · 4% next
Isotherm Temperature Comparison1×
graph interpretation of boyle's law isotherms
Figure-based · 4% next
Compressibility Factor1×
interpret compressibility factor of a gas
One-line MCQ · 4% next

Idea	Times	Format	Chance next	Foundation for
Dalton's Law of Partial Pressuresnumerical	2	NumericalCalculation	4%	7 ideas
Ideal Gas Equationnumerical	2	NumericalCalculation	4%	21 ideas
van der Waals Equationcompare liquefaction using van der waals a	2	One-line MCQConcept	4%	–
Boyle's Law Isotherm Graphsgraph interpretation of gas law	1	Figure-basedData or graph	4%	–
Types of Intermolecular Forcescount correct statements on intermolecular forces	1	OtherRecall	4%	–
Isotherm Temperature Comparisongraph interpretation of boyle's law isotherms	1	Figure-basedData or graph	4%	–
Compressibility Factorinterpret compressibility factor of a gas	1	One-line MCQConcept	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

Ideal Gas Law questions, year by year

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

NEET 20232 questions

Q72
Intermolecular forces are forces of attraction and repulsion between interacting particles that will include : A. dipole - dipole forces.…
Idea: Types of Intermolecular Forces
New ideaEasyOther
Q77
Which amongst the following options is correct graphical representation of Boyle's Law?
Idea: Boyle's Law Isotherm Graphs
New ideaMediumFigure-based · figure

NEET 20222 questions

Q60
Which one is not correct mathematical equation for Dalton's Law of partial pressure ? Here p = total pressure of gaseous mixture
Idea: Dalton's Law of Partial Pressures
MediumOne-line MCQ
Q99
A 10.0 L flask contains 64 g of oxygen at 27°C. (Assume $\mathrm{O_2}$ gas is behaving ideally). The pressure inside the flask in bar is…
Idea: Ideal Gas Equation
Asked last yearEasyNumerical

NEET 20212 questions

Q70
Choose the correct option for graphical representation of Boyle's law, which shows a graph of pressure vs. volume of a gas at different…
Idea: Isotherm Temperature Comparison
New ideaMediumFigure-based · figure
Q90
Choose the correct option for the total pressure (in atm.) in a mixture of 4 g $\mathrm{O_2}$ and 2 g $\mathrm{H_2}$ confined in a total…
Idea: Ideal Gas Equation
New ideaEasyNumerical

NEET 20201 question

Q110
A mixture of $\mathrm{N_2}$ and Ar gases in a cylinder contains 7 g of $\mathrm{N_2}$ and 8 g of Ar. If the total pressure of the mixture…
Idea: Dalton's Law of Partial Pressures
New ideaEasyNumerical

NEET 20191 question

Q84
A gas at 350 K and 15 bar has molar volume 20 percent smaller than that for an ideal gas under the same conditions. The correct option…
Idea: Compressibility Factor
New ideaMediumOne-line MCQ

NEET 20182 questions

Q76
Given van der Waals constant for $\mathrm{NH_3}$ , $\mathrm{H_2}$ , $\mathrm{O_2}$ and $\mathrm{CO_2}$ are respectively 4.17, 0.244, 1.36…
Idea: van der Waals Equation
New ideaEasyOne-line MCQ
Q86
The correction factor 'a' to the ideal gas equation corresponds to
Idea: van der Waals Equation
New ideaEasyOne-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.