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Sunday, 25 October

JEE Main · Chemistry · Class 11

States of Matter: JEE Main previous year questions

This chapter is not in NTA's JEE Main 2026 syllabus. It had 36 questions in the shifts Lumi analysed; they are kept here for reference.

Questions
36
in 35 of 108 shifts · 5 of 8 years
Average a shift
0.2
of 25 Chemistry · 0.0 since 2024 -0.3
Typical range
0.0–0.4
questions a shift; fewest 0.0, most 0.5
Syllabus
Dropped
NTA JEE Main 2026 syllabus
  • Typical range (fact)
  • Average a shift (fact)
  • Weighted estimate (model)

Questions are counted per shift, out of the 25 each subject has, in the shifts Lumi analysed; papers that offered 30 a subject (2017, 2021–2024) are scaled to 25. Typical range: the middle six of the eight years (2017, 2020–2026), leaving out the single highest and lowest year. The average and the range are historical fact. The weighted estimate is a model: each year's share, with recent years counting more (half-life three years), and chapters NTA dropped from the syllabus set near zero. It is a guide to effort, not a forecast of the paper.

Key findings

States of Matter at a glance

  1. 01

    81%

    of the 104 ideas in Lumi's map of the chapter have not been asked or touched on in the shifts analysed.

  2. 02

    69%

    of its questions asked for a numerical answer, 2.3 times the Chemistry average.

  3. 03

    0%

    of its questions were rated hard, against 6% across all Chemistry questions in the same shifts.

Questions a shift, year by year

Out of the 25 Chemistry questions in a shift. Years differ in how many shifts Lumi analysed, so each year is scaled to one shift.

0240’170.3’200.4’210.5’220.3’230’240.1’250’26

Raw count: 2017: 0 in 1 shift · 2020: 4 in 12 shifts · 2021: 11 in 24 shifts · 2022: 15 in 24 shifts · 2023: 5 in 12 shifts · 2024: 0 in 18 shifts · 2025: 1 in 8 shifts · 2026: 0 in 9 shifts.

Kind of question

SHARE OF QUESTIONS
  • Numerical answer69%
  • Diagram based8%
  • Conceptual6%
  • Multi-step3%
  • Calculation3%
  • Application3%
  • Match the list3%
  • Two statements3%
  • Data or graph3%

Most common asks: statement i/ii on melting of ice (1); mass of gas from pv=nrt (1); graph interpretation of pressure vs density (1).

Profile

This chapter in numbers

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

Syllabus
Dropped
NTA JEE Main 2026
Last asked
2025
Share of Chemistry
0.9%
of its questions, all shifts analysed
Busiest year
2022
0.5 questions a shift
Year to year
Swings a lot
varies by about 0.2 questions a shift
Long-run direction
-0.01
questions a shift, per year
Easy questions
47%
0% rated hard
Numerical answer
69%
2.3× the Chemistry rate
With a figure
17%
graph, diagram or structure
Foundation for others
96%
of its ideas are used in other chapters

Difficulty, year by year

Each question rated easy, medium or hard. Each bar is that year’s split, so years compare directly; the number is the questions in that year’s analysed shifts (1 to 24 shifts a year).

  • 2017
  • 20204
  • 202111
  • 202215
  • 20235
  • 2024
  • 20251
  • 2026
  • Easy
  • Medium
  • Hard

What it asks you to do

SHARE OF QUESTIONS
  • Calculation69%
  • Data or graph11%
  • Conceptual8%
  • Multi-step6%
  • Application3%
  • Recall3%

Coverage

How much of the chapter JEE Main has used

We split the chapter into 104 ideas. In the 108 shifts analysed, JEE Main built a question around 16 of them. Most of the chapter has never been the main idea of a question, so past questions alone leave most of it out.

Asked as the main idea
16
Touched on in a question
4
Never asked
84

Topics

What repeats, topic by topic

This chapter's questions per topic in each year's analysed shifts. The number is the count; the shade is scaled to one shift, so a year with more analysed shifts (1 to 24 a year) does not look darker. 1 questions had no close topic in Lumi's map and count for the chapter only.

’17’20’21’22’23’24’25’26
012+questions in that year’s analysed shifts, shaded per shift
  • Ideal Gas Laws

    As a topic: 35 questions in 6 of 8 years, most often numerical value, 66% numerical answer.

  • Real Gases

    As a topic: 7 questions in 4 of 8 years, most often single correct, 43% numerical answer.

  • Colligative Properties

    As a topic: 89 questions in 8 of 8 years, most often numerical value, 70% numerical answer. Recent asks: count correct statements on colligative properties; numerical: vapour pressure from mole fraction; statement I/II on osmosis and osmotic pressure.

  • Enthalpy and Hess's Law

    As a topic: 62 questions in 8 of 8 years, most often numerical value, 74% numerical answer. Recent asks: numerical: enthalpy of reaction from formation enthalpies; numerical: enthalpy of formation from bomb calorimetry; statement I/II on heat capacities of ideal gas.

Drill down

Topic, idea, question

Open a topic to see every idea JEE Main tested inside it, then open an idea to read the questions. Each row shows its 8 years.

  • Open26 · 72%29123

    10 ideas inside

    • OpenRepeated8 · 31%26
    • OpenRepeated5 · 19%3
    • OpenRepeated3 · 12%2
    • OpenRepeated2 · 8%
    • Open2 · 8%2
    • OpenRepeated2 · 8%
    • Open1 · 4%
    • Open1 · 4%
    • Open1 · 4%
    • Open1 · 4%
  • Open6 · 17%222
  • Open1 · 3%
  • Open1 · 3%
  • Open1 · 3%

Squares are the 8 years with analysed shifts, 2017 to 2026. A number is the questions that year when there is more than one; the shade is scaled to one shift, so a year with more analysed shifts (1 to 24 a year) does not look darker. Share is of the level above.

Ideas

The exact ideas JEE Main has asked

Inside the topics, 14 different ideas were tested; 6 came more than once. These are the repeats, then the ideas new since 2024.

Dots are the 8 years with analysed shifts, 2017 to 2026.

Every question

All 36 States of Matter questions

Newest first, shift by shift. Each opens with its options and the official answer.

JEE Main 20251 question

  1. 3 Apr 2025, Shift 2 · Q53Given below are two statements: Statement I : When a system containing ice in equilibrium with water (liquid) is heated, heat is absorbed…EasyTwo statements

JEE Main 20235 questions

  1. 8 Apr 2023, Shift 1 · Q81[figure: three bulbs joined by pipes with stopcocks] Three bulbs are filled with CH4\mathrm{CH_4}, CO2\mathrm{CO_2} and Ne as shown in the…MediumNumerical valueHas a figure
  2. 8 Apr 2023, Shift 2 · Q62Arrange the following gases in increasing order of van der Waals constant 'a' A. Ar B. CH4\mathrm{CH_4} C. H2O\mathrm{H_2O} D.…EasyOther
  3. 10 Apr 2023, Shift 1 · Q81At constant temperature, a gas is at a pressure of 940.3 mm Hg. The pressure at which its volume decreases by 40% is __________ mm Hg.…EasyNumerical value
  4. 12 Apr 2023, Shift 1 · Q81At 600K, the root mean square (rms) speed of gas X (molar mass = 40) is equal to the most probable speed of gas Y at 90K. The molar mass…EasyNumerical value
  5. 13 Apr 2023, Shift 1 · Q82A certain quantity of real gas occupies a volume of 0.15 dm30.15\ \mathrm{dm^3} at 100 atm and 500 K when its compressibility factor is 1.07.…MediumNumerical value

JEE Main 202215 questions

  1. 25 Jul 2022, Shift 1 · Q83The pressure of a moist gas at 27∘27^\circC is 44 atm. The volume of the container is doubled at the same temperature. The new pressure of…MediumNumerical value
  2. 25 Jul 2022, Shift 2 · Q82A sealed flask with a capacity of 2 dm3^3 contains 11 g of propane gas. The flask is so weak that it will burst if the pressure becomes 2…MediumNumerical value
  3. 26 Jul 2022, Shift 1 · Q82A mixture of hydrogen and oxygen contains 40% hydrogen by mass when the pressure is 2.2 bar. The partial pressure of hydrogen is…MediumNumerical value
  4. 26 Jul 2022, Shift 2 · Q81A 10 g mixture of hydrogen and helium is contained in a vessel of capacity 0.0125 m3\mathrm{m^3} at 6 bar and 27°C. The mass of helium in…MediumNumerical value
  5. 27 Jul 2022, Shift 2 · Q82For a real gas at 25°C temperature and high pressure (99 bar) the value of compressibility factor is 2, so the value of Vander Waal’s…MediumNumerical value
  6. 29 Jul 2022, Shift 2 · Q81‘x’ g of molecular oxygen (O2\mathrm{O_2}) is mixed with 200 g of neon (Ne). The total pressure of the non-reactive mixture of…EasyNumerical value
  7. 30 Jul 2022, Shift 2 · Q31Combination of temperature and pressure causing the greatest deviation from ideal gas behaviour is;EasySingle correct
  8. 24 Jun 2022, Shift 2 · Q81At 300 K, a sample of 3.0 g of gas A occupies the same volume as 0.2 g of hydrogen at 200 K at the same pressure. The molar mass of gas A…MediumNumerical value
  9. 25 Jun 2022, Shift 2 · Q82A rigid nitrogen tank stored inside a laboratory has a pressure of 30 atm at 06:00 am when the temperature is 27 °C. At 03:00 pm, when the…EasyNumerical value
  10. 26 Jun 2022, Shift 1 · Q62An evacuated glass vessel weighs 40.0 g when empty, 135.0 g when filled with a liquid of density 0.95 g mL−1^{-1} and 40.5 g when filled…MediumSingle correct
  11. 26 Jun 2022, Shift 1 · Q852.0 g of H2\mathrm{H_2} gas is adsorbed on 2.5 g of platinum powder at 300 K and 1 bar pressure. The volume of the gas adsorbed per gram…MediumNumerical value
  12. 27 Jun 2022, Shift 2 · Q61Which amongst the given plots is the correct plot for pressure (p) vs density (d) for an ideal gas?EasyDiagram basedHas a figure
  13. 28 Jun 2022, Shift 2 · Q81100 g of an ideal gas is kept in a cylinder of 416 L volume at 27°C under 1.5 bar pressure. The molar mass of the gas is __________ g…MediumNumerical value
  14. 29 Jun 2022, Shift 1 · Q81Geraniol, a volatile organic compound, is a component of rose oil. The density of the vapour is 0.46 gL−10.46\ \mathrm{gL^{-1}} at…MediumNumerical value
  15. 29 Jun 2022, Shift 2 · Q81A box contains 0.90 g of liquid water in equilibrium with water vapour at 27°C. The equilibrium vapour pressure of water at 27°C is 32.0…MediumNumerical value

JEE Main 202111 questions

  1. 3 Aug 2021, Shift 1 · Q51Assuming H2\mathrm{H_2} is an ideal gas, consider the quantity “P.dd”, where ‘P’ is the pressure in atm and ‘dd’ is the density in g…MediumNumerical value
  2. 3 Aug 2021, Shift 2 · Q52The total kinetic energy of 10 moles of a monoatomic ideal gas at 25°C in kJ is ‾\underline{\hspace{2em}}. (Nearest integer) [R = 8.314 J…EasyNumerical value
  3. 27 Aug 2021, Shift 1 · Q31The unit of the van der Waals gas equation parameter ‘a’ in…EasySingle correct
  4. 27 Aug 2021, Shift 2 · Q52Two flasks I and II shown below are connected by a valve of negligible volume. [figure: two circular flasks joined through a valve; flask…MediumNumerical valueHas a figure
  5. 31 Aug 2021, Shift 1 · Q31Which one of the following is the correct PV vs P plot at constant temperature for an ideal gas ? (P and V stand for pressure and volume…EasyDiagram basedHas a figure
  6. 24 Feb 2021, Shift 2 · Q52The volume occupied by 4.75 g of acetylene gas at 50∘50^\circC and 740 mmHg pressure is __________ L. (Rounded off to the nearest integer)…EasyNumerical value
  7. 25 Feb 2021, Shift 1 · Q52A car tyre is filled with nitrogen gas at 35 psi at 27∘27^\circC. It will burst if pressure exceeds 40 psi. The temperature in ∘^\circC at…EasyNumerical value
  8. 26 Feb 2021, Shift 1 · Q52A certain gas obeys P(Vm−b)=RT\mathrm{P(V_m - b) = RT}. The value of (∂Z∂P)T\left(\frac{\partial Z}{\partial P}\right)_T is xbRT\frac{xb}{RT}. The value…MediumNumerical value
  9. 25 Jul 2021, Shift 1 · Q52A home owner uses 4.00×103 m34.00\times10^3\ \mathrm{m^3} of methane (CH4\mathrm{CH_4}) gas, (assume CH4\mathrm{CH_4} is an ideal gas) in a year to…EasyNumerical value
  10. 25 Jul 2021, Shift 2 · Q52An LPG cylinder contains gas at a pressure of 300 kPa at 27°C. The cylinder can withstand the pressure of 1.2×1061.2 \times 10^{6} Pa. The room…EasyNumerical value
  11. 17 Mar 2021, Shift 1 · Q52The pressure exerted by a non-reactive gaseous mixture of 6.4 g of methane and 8.8 g of carbon dioxide in a 10 L vessel at 27∘27^\circC is…EasyNumerical value

JEE Main 20204 questions

  1. 8 Jan 2020, Shift 1 · Q31A graph of vapour pressure and temperature for three different liquids X, Y, and Z is shown below : The following inferences are made :…MediumOtherHas a figure
  2. 2 Sep 2020, Shift 1 · Q31Which one of the following graphs is not correct for ideal gas ? dd = Density, PP = Pressure, TT = TemperatureMediumDiagram basedHas a figure
  3. 2 Sep 2020, Shift 2 · Q31Match the type of interaction in column A with the distance dependence of their interaction energy in column B : A (I) ion-ion (II) dipole…MediumMatch the list
  4. 3 Sep 2020, Shift 2 · Q31A mixture of one mole each of H2\mathrm{H_2}, He and O2\mathrm{O_2} each are enclosed in a cylinder of volume V at temperature T. If the…EasySingle correct

Questions from the official JEE Main papers published by NTA. Chapter, topic and idea tags, counts and notes are Lumi’s. Pattern: Asked most years.

More Chemistry, Class 11

All JEE Main chaptersJEE Main Chemistry analysisStudy plan