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Chemistry - States of Matter

Practise 84 JEE Main previous year questions on States of Matter, compiled from papers spanning 2002 to 2025. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty JEE Main tests.

States of Matter has been asked in 20 of the 25 years of JEE Main papers analysed (2002–2026), with 84 questions in all. 43% of them were easy, 46% moderate and 11% tough. Most of its questions came from 2022, with 13 questions that year. In the last three years (2024–2026) it had 2 questions across 49 papers, about 0 per paper.

The chapter's 6 topics are not weighted equally: Gas laws and Ideal Gas Equation (37 questions, 44%), Kinetic theory of gases (14 questions, 17%), and Real Gases and Van der Waal's Equation (14 questions, 17%) have been asked the most. Gas laws and Ideal Gas Equation has also led over the last five years, with 12 questions. Real Gases and Van der Waal's Equation has produced the most tough questions (4).

  1. 1At the sea level, the dry air mass percentage composition is given as nitrogen gas : 70.0, oxygen gas : 27.0 and argon gas : 3.0. If total p07 Apr, 2025 (M)Mixture of gases
  2. 2For a reaction, in a constant volume container, no products were present initially. The final pressure of the system when of reaction gets c24 Jan, 2025 (M)Mixture of gases
  3. 3A certain quantity of real gas occupies a volume of 0 . 15 dm 3 at 100 atm and 500 K when its compressibility factor is 1 . 07 . Its volume 13 Apr, 2023 (M)Real Gases and Van der Waal's Equation
  4. 4At 600 K , the root mean square ( rms ) speed of gas X (molar mass = 40 ) is equal to the most probable speed of gas Y at 90 K . The molar m12 Apr, 2023 (M)Kinetic theory of gases
  5. 5At 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 . (Nea10 Apr, 2023 (M)Gas laws and Ideal Gas Equation
  6. 6Three bulbs are filled with CH 4 , CO 2 and Ne as shown in the picture. The bulbs are connected through pipes of zero volume. When the stopc08 Apr, 2023 (M)Gas laws and Ideal Gas Equation
  7. 7Arrange the following gases in increasing order of van der Waals constant ' a ' (A) Ar (B) CH 4 (C) H 2 O (D) C 6 H 6 Choose the correct opt08 Apr, 2023 (E)Critical phenomena and liquefaction
  8. 8For 1 mol of gas, the plot of pV vs p is shown below. p is the pressure and V is the volume of the gas. What is the value of compressibility29 Jan, 2023 (M)Gas laws and Ideal Gas Equation
  9. 9The number of statement s, which are correct with respect to the compression of carbon dioxide from point (a) in the Andrews isotherm from t24 Jan, 2023 (E)Critical phenomena and liquefaction
  10. 10Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R . Assertion A : Activated charcoal adso27 Jul, 2022 (M)Critical phenomena and liquefaction
  11. 11for a real gas at 25 C temperature and high pressure ( 99 bar) the value of compressibility factor is 2 , so the value of Van 1der Waal s co27 Jul, 2022 (E)Real Gases and Van der Waal's Equation
  12. 12A mixture of hydrogen and oxygen contains 40 % hydrogen by mass when the pressure is 2 . 2 bar. The partial pressure of hydrogen is bar.26 Jul, 2022 (M)Mixture of gases
  13. 13A 10 g mixture of hydrogen and helium is contained in a vessel of capacity 0 . 0125 m 3 at 6 bar and 27 C . The mass of helium in the mixtur26 Jul, 2022 (E)Gas laws and Ideal Gas Equation
  14. 14The pressure of a moist gas at 27 C is 4 atm . The volume of the container is doubled at the same temperature. The new pressure of the moist25 Jul, 2022 (M)Mixture of gases
  15. 15A sealed flask with a capacity of 2 dm 3 contains 11 g of propane gas. The flask is so weak that it will burst if the pressure becomes 2 MPa25 Jul, 2022 (E)Gas laws and Ideal Gas Equation
  16. 16Geraniol, a volatile organic compound, is a component of rose oil. The density of the vapour is 0 . 46 gL - 1 at 257 C and 100 mmHg . The mo29 Jun, 2022 (M)Gas laws and Ideal Gas Equation
  17. 17A 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 32 . 0 T29 Jun, 2022 (E)Gas laws and Ideal Gas Equation
  18. 18100 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 mol - 1 . (Near28 Jun, 2022 (E)Gas laws and Ideal Gas Equation
  19. 19Which amongst the given plots is the correct plot for pressure p vs density d for an ideal gas?27 Jun, 2022 (E)Gas laws and Ideal Gas Equation
  20. 20An evacuated glass vessel weighs 40 . 0 g when empty, 135 . 0 g when filled with a liquid of density 0 . 95 g mL - 1 and 40 . 5 g when fille26 Jun, 2022 (M)Gas laws and Ideal Gas Equation
  21. 21A 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 25 Jun, 2022 (E)Gas laws and Ideal Gas Equation
  22. 22At 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 gas24 Jun, 2022 (E)Gas laws and Ideal Gas Equation
  23. 23An empty LPG cylinder weighs 14 . 8 kg . When full, it weighs 29 . 0 kg and shows a pressure of 3 . 47 atm . In the course of use at ambient01 Sep, 2021 (E)Gas laws and Ideal Gas Equation
  24. 24Which 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 of31 Aug, 2021 (M)Gas laws and Ideal Gas Equation
  25. 25The unit of the van der Waals gas equation parameter ' a ' in P + an 2 V 2 ( V - nb ) = nRT is:27 Aug, 2021 (M)Real Gases and Van der Waal's Equation
  26. 26Two flasks I and II shown below are connected by a valve of negligible volume. When the valve is opened, the final pressure of the system in27 Aug, 2021 (E)Gas laws and Ideal Gas Equation
  27. 27A home owner uses 4 . 00 10 3 m 3 of methane CH 4 gas, (assume CH 4 is an ideal gas) in a year to heat his home. Under the pressure of 1 . 025 Jul, 2021 (M)Gas laws and Ideal Gas Equation
  28. 28An LPG cylinder contains gas at a pressure of 300 kPa at 27 C . The cylinder can withstand the pressure of 1 . 2 10 6 Pa . The room in which25 Jul, 2021 (E)Gas laws and Ideal Gas Equation
  29. 29The 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 C is _____17 Mar, 2021 (M)Mixture of gases
  30. 30The number of chlorine atoms in 20 mL of chlorine gas at STP is _______ 10 21 . (Round off to the Nearest Integer). [Assume chlorine is an i17 Mar, 2021 (E)Gas laws and Ideal Gas Equation
  31. 31A certain gas obeys P V m - b = RT . The value of Z P T is xb RT . The value of x is (Integer answer) ( Z : compressibility factor)26 Feb, 2021 (M)Gas laws and Ideal Gas Equation
  32. 32A car tyre is filled with nitrogen gas at 35 psi at 27 C . It will burst if pressure exceeds 40 psi. The temperature in C at which the car t25 Feb, 2021 (M)Gas laws and Ideal Gas Equation
  33. 33The volume occupied by 4 . 75 g of acetylene gas at 50 C and 740 mm Hg pressure is ____________ L . (Rounded off to the nearest integer) [Gi24 Feb, 2021 (E)Gas laws and Ideal Gas Equation
  34. 34A spherical balloon of radius 3 cm containing helium gas has a pressure of 48 10 - 3 bar. At the same temperature, the pressure, of a spheri06 Sep, 2020 (M)Gas laws and Ideal Gas Equation
  35. 35A mixture of one mole each of H 2 , He and O 2 each are enclosed in a cylinder of volume V at temperature T. If the partial pressure of H 2 03 Sep, 2020 (E)Mixture of gases
  36. 36Which one of the following graphs is not correct for ideal gas? d = Density, P = Pressure, T = Temperature02 Sep, 2020 (M)Gas laws and Ideal Gas Equation
  37. 37A mixture of gases O 2 , H 2 and C O are taken in a closed vessel containing charcoal The graph that represents the correct behaviour of pre09 Jan, 2020 (E)Mixture of gases
  38. 38NaClO 3 is used, even in spacecrafts, to produce O 2 . The daily consumption of pure O 2 by a person in 492 L at 1 atm, 300 K . How much amo08 Jan, 2020 (E)Gas laws and Ideal Gas Equation
  39. 39Identify the correct labels of A , B and C in the following graph from the options given below: Root mean square speed V r m s ; most proabl07 Jan, 2020 (E)Kinetic theory of gases
  40. 40Consider the following table: Gas a / k P a d m 6 m o l - 1 b / d m 3 m o l - 1 A 642.32 0.05196 B 155.21 0.04136 C 431.91 0.05196 D 155.21 10 Apr, 2019 (M)Real Gases and Van der Waal's Equation
  41. 41Points I , I I and I I I in the following plot respectively correspond to ( V m p : most probable velocity)10 Apr, 2019 (E)Kinetic theory of gases
  42. 42Consider the van der Waal s constants, a and b , for the following gases. Gas A r N e K r X e a / ( a t m d m 6 m o l - 2 ) 1.3 0.2 5.1 4.1 09 Apr, 2019 (M)Critical phenomena and liquefaction
  43. 43At a given temperature T , gases N e , A r , X e and K r are found to deviate from ideal gas behaviour. Their equation of state is given as 09 Apr, 2019 (E)Real Gases and Van der Waal's Equation
  44. 44Given: On the basis of data given above, predict which of the following gases shows the least adsorption on a definite amount of charcoal?12 Jan, 2019 (M)Critical phenomena and liquefaction
  45. 45The volume of gas A is twice than that of gas B . The compressibility factor of gas A is thrice than that of gas B at same temperature. What12 Jan, 2019 (M)Real Gases and Van der Waal's Equation
  46. 46An open vessel at 27 o C is heated until two fifth of the air (assumed as an ideal gas) in it has escaped from the vessel. Assuming that the12 Jan, 2019 (E)Gas laws and Ideal Gas Equation
  47. 470.5 moles of gas A and x moles of gas B exert a pressure of 200 P a in a container of volume 10 m 3 at 1000 K . Given, R is the gas constant09 Jan, 2019 (M)Gas laws and Ideal Gas Equation
  48. 48Assuming ideal gas behavior, the ratio of density of ammonia to that of hydrogen chloride at same temperature and pressure is: (Atomic weigh16 Apr, 2018 (Online)Gas laws and Ideal Gas Equation
  49. 49At 300 K , the density of a certain gaseous molecule at 2 bar is double to that of dinitrogen N 2 at 4 bar. The molar mass of the gaseous mo09 Apr, 2017 (Online)Gas laws and Ideal Gas Equation
  50. 50Among the following, the incorrect statement is:08 Apr, 2017 (Online)Real Gases and Van der Waal's Equation

Frequently Asked Questions

1.How many questions are available for States of Matter?

This chapter includes 84 questions compiled from JEE Main papers spanning 2002 to 2025.

2.Are these questions only from JEE Main, or from other exams too?

These are JEE Main questions specifically for the States of Matter chapter. Questions from other exams like NTA Abhyas (JEE Main) or JEE Advanced are organised separately under their respective exam sections.

3.Is States of Matter an important chapter for JEE Main Chemistry?

States of Matter has appeared in 20 of the 25 years of JEE Main papers covered here, with 84 questions across 75 papers - about one per paper it appears in.

4.What is the difficulty level of States of Matter questions in JEE Main?

Of the 84 questions analysed for this chapter, 43% are easy, 46% moderate and 11% tough. 2022 had the most, with 13 questions.

5.Which topics in States of Matter should I focus on?

These topics have carried the most weightage in States of Matter:

  • Gas laws and Ideal Gas Equation - 37 questions (44%)
  • Kinetic theory of gases - 14 questions (17%)
  • Real Gases and Van der Waal's Equation - 14 questions (17%)
  • Real Gases and Van der Waal's Equation has produced the most tough questions (4).
6.Is States of Matter's weightage in JEE Main going up or down?

Across all 75 papers analysed, States of Matter has averaged about 1.1 questions per paper. In the last three years (2024–2026), that average has fallen, at about 0.0 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.