Chemistry - States of Matter
Practise 25 WBJEE previous year questions on States of Matter, compiled from papers spanning 2010 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty WBJEE tests.
States of Matter has been asked in 14 of the 18 years of WBJEE papers analysed (2009–2026), with 25 questions in all. 44% of them were easy, 48% moderate and 8% tough. Most of its questions came from 2014, with 4 questions that year. In the last three years (2024–2026) it had 5 questions across 3 papers, about 1.7 per paper.
The chapter's 5 topics are not weighted equally: Kinetic theory of gases (8 questions, 32%), Real Gases and Van der Waal's Equation (5 questions, 20%), and Mixture of gases (4 questions, 16%) have been asked the most. Kinetic theory of gases has also led over the last five years, with 4 questions. Mixture of gases has produced the most tough questions (1).
- 1The van der Waal's equation: is valid for2026Real Gases and Van der Waal's Equation
- 2Which of the following plot(s) is/are correct representation(s) of Boyle's Law?2026Gas laws and Ideal Gas Equation
- 3An LPG (Liquified Petroleum Gas) cylinder weighs 15.0 kg when empty. When full, it weighs 30.0 kg and shows a pressure of 3.0 atm . In the c2025Gas laws and Ideal Gas Equation
- 4of a hydrocabon diffuses in 30 minutes, while under the same conditions of gas diffuses in one hour. The molecular formula of the hydrocabon2025Mixture of gases
- 5The compressibility factor for a van der Waal gas at high pressure is2024Real Gases and Van der Waal's Equation
- 6The root mean square (rms) speed of \(X_2\) gas is \( {x} {m/s}\) at a given temperature. When the temperature is doubled, the \( {X}_2\) mo2023Kinetic theory of gases
- 7Case \(-1:\) An ideal gas of molecular weight \(M\) at temperature \(T\). Case \(-2:\) Another ideal gas of molecular weight \(2 {M}\) at te2023Kinetic theory of gases
- 8Which statement(s) is/are applicable above critical temperature?2023Critical phenomena and liquefaction
- 9The average speed of at is equal to that of at . The ratio is2022Kinetic theory of gases
- 10Let is the r.m.s speed of at . At what temperature, the most probable speed of helium will be half of ?2022Kinetic theory of gases
- 11Molecular velocities of two gases at the same temperature are and Their masses are and respectively. Which of the following expressions is c2021Mixture of gases
- 12At temperature and pressure, the density of a gas is The gas is2020Gas laws and Ideal Gas Equation
- 13For a van der Waals' gas, the term represents some2019Real Gases and Van der Waal's Equation
- 14The quantity corresponds to2019Kinetic theory of gases
- 15For same mass of two different ideal gases of molecular weights and , Plots of log vs log at a given constant temperature are shown. Identif2017Gas laws and Ideal Gas Equation
- 16Amongst the following, which should have the highest rms speed at the same temperature?2016Kinetic theory of gases
- 17The RMS velocity of CO gas molecules at is approximately . For molecules at , the RMS velocity is approximately2015Kinetic theory of gases
- 18A gas can be liquefied at temperature T and pressure provided2015Critical phenomena and liquefaction
- 19The units of surface tension and viscosity of liquids respectively are2015Critical phenomena and liquefaction
- 20At a certain temperature the time required for the complete diffusion of of gas is 30 min. The time required for the complete diffusion of o2014Mixture of gases
- 21Four gases and have almost sande values of but their ' values are van det Waals' constants) are in the order At a particular temperation amo2014Critical phenomena and liquefaction
- 22The compressibility factor of one mole of a van der Waals' gas of negligible ' ' value is2014Real Gases and Van der Waal's Equation
- 23Two gases (molecular weight ) and Y (molecular weight ) are at the same temperature in two different containers. Their root mean square velo2014Kinetic theory of gases
- 24A van der Waals' gas may behave ideally when2013Real Gases and Van der Waal's Equation
- 25of a hydrocarbon having molecular formula . What is the value of ' '?2010Mixture of gases
Frequently Asked Questions
1.How many questions are available for States of Matter?
This chapter includes 25 questions compiled from WBJEE papers spanning 2010 to 2026.
2.Are these questions only from WBJEE, or from other exams too?
These are WBJEE questions specifically for the States of Matter chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.
3.Is States of Matter an important chapter for WBJEE Chemistry?
States of Matter has appeared in 14 of the 18 years of WBJEE papers covered here, with 25 questions across 14 papers - about 2 per paper it appears in.
4.What is the difficulty level of States of Matter questions in WBJEE?
Of the 25 questions analysed for this chapter, 44% are easy, 48% moderate and 8% tough. 2014 had the most, with 4 questions.
5.Which topics in States of Matter should I focus on?
These topics have carried the most weightage in States of Matter:
- Kinetic theory of gases - 8 questions (32%)
- Real Gases and Van der Waal's Equation - 5 questions (20%)
- Mixture of gases - 4 questions (16%)
- Mixture of gases has produced the most tough questions (1).
6.Is States of Matter's weightage in WBJEE going up or down?
Across all 14 papers analysed, States of Matter has averaged about 1.8 questions per paper. In the last three years (2024–2026), that average has stayed about the same, at about 1.7 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.