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States of Matter JEE Main MCQ & Practice Questions

Practice States of Matter MCQs for JEE Main Chemistry with answers, explanations, chapter revision and related ChemNexa mock tests.

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States of Matter Revision Guide for JEE Main Chemistry

States of Matter is part of JEE Main Chemistry preparation. A strong revision plan should combine concept review with exam-style questions so that definitions, relationships, calculations and exceptions are recalled accurately.

Use the sample MCQs on this page to check understanding, then attempt the related ChemNexa tests for broader practice. When an answer is wrong, review the explanation and return to the underlying concept before attempting another set.

Important Topics

  • Core definitions and principles
  • Important equations or relationships
  • Common applications and examples
  • Frequently confused concepts
  • Exam-style multiple-choice questions
  • Error review and targeted revision

Revision Tip

Create a one-page summary of trends, structures, reactions, exceptions and key terminology for States of Matter, then test recall with mixed MCQs.

What to practise in States of Matter

Concept Revision

Revise definitions, principles, equations, trends and core ideas from States of Matter before attempting MCQs.

Exam-style MCQs

Use chapter-focused multiple-choice practice to improve accuracy, recall and application for JEE Main Chemistry.

Performance Practice

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Top 20 States of Matter MCQs with Answers

These public questions are selected from the exact States of Matter chapter, screened for topic relevance and deduplicated so repeated versions of the same MCQ are not shown publicly. Use them for quick revision, then sign in to attempt the complete test experience with more questions, results and performance review.

JEE Main Chemistry · States of Matter · Very Very Hard

1. Boyle's law at constant temperature relates pressure inversely to:

  • A. Moles only
  • B. Density only
  • C. Volume
  • D. Temperature
Answer: C
Explanation: PV is constant for a fixed amount of gas at constant T.

JEE Main Chemistry · States of Matter · Very Very Hard

2. Charles' law at constant pressure states volume is proportional to:

  • A. Density
  • B. Absolute temperature
  • C. Pressure
  • D. Molar mass
Answer: B
Explanation: V/T is constant at fixed pressure.

JEE Main Chemistry · States of Matter · Very Very Hard

3. Avogadro's law states gas volume at fixed T and P is proportional to:

  • A. Number of moles
  • B. Molar mass
  • C. Density
  • D. Pressure
Answer: A
Explanation: V is proportional to n.

JEE Main Chemistry · States of Matter · Very Very Hard

4. The ideal gas equation is:

  • A. P=nVRT
  • B. V=nPRT
  • C. PV=RT/n
  • D. PV=nRT
Answer: D
Explanation: Combining elementary gas laws gives PV=nRT.

JEE Main Chemistry · States of Matter · Very Very Hard

5. At STP, one mole of an ideal gas occupies approximately:

  • A. 44.8 L
  • B. 1 L
  • C. 22.4 L
  • D. 11.2 L
Answer: C
Explanation: At 273.15 K and 1 atm the conventional molar volume is about 22.4 L.

JEE Main Chemistry · States of Matter · Very Very Hard

6. Dalton's law states total pressure equals:

  • A. Highest partial pressure
  • B. Sum of partial pressures
  • C. Product of partial pressures
  • D. Average pressure
Answer: B
Explanation: For an ideal gas mixture Ptotal=sum Pi.

JEE Main Chemistry · States of Matter · Very Very Hard

7. Partial pressure of component i in an ideal mixture is:

  • A. xi Ptotal
  • B. Ptotal/xi
  • C. xi/Ptotal
  • D. niRT
Answer: A
Explanation: Dalton's law gives Pi=xiPtotal.

JEE Main Chemistry · States of Matter · Very Very Hard

8. Graham's law gives rate of diffusion proportional to:

  • A. M
  • B. sqrt(M)
  • C. 1/M
  • D. 1/sqrt(M)
Answer: D
Explanation: Diffusion/effusion rate varies inversely with square root of molar mass.

JEE Main Chemistry · States of Matter · Very Very Hard

9. Average translational kinetic energy of an ideal gas molecule depends only on:

  • A. Volume
  • B. Molar mass
  • C. Absolute temperature
  • D. Pressure
Answer: C
Explanation: Average translational KE is 3kT/2.

JEE Main Chemistry · States of Matter · Very Very Hard

10. Root-mean-square speed of gas molecules is:

  • A. sqrt(2RT/M)
  • B. sqrt(3RT/M)
  • C. sqrt(RT/3M)
  • D. 3RT/M
Answer: B
Explanation: urms=sqrt(3RT/M).

JEE Main Chemistry · States of Matter · Very Very Hard

11. At the same temperature, the gas with lower molar mass has:

  • A. Higher rms speed
  • B. Lower rms speed
  • C. Same rms speed
  • D. Zero rms speed
Answer: A
Explanation: urms varies as 1/sqrt(M).

JEE Main Chemistry · States of Matter · Very Very Hard

12. For a Maxwell speed distribution, the correct order is:

  • A. ump > uavg > urms
  • B. uavg > urms > ump
  • C. All equal
  • D. urms > uavg > ump
Answer: D
Explanation: For an ideal gas urms exceeds average speed, which exceeds most probable speed.

JEE Main Chemistry · States of Matter · Very Very Hard

13. Real gases approach ideal behaviour best at:

  • A. High pressure only
  • B. Low temperature only
  • C. Low pressure and high temperature
  • D. High pressure and low temperature
Answer: C
Explanation: Low density and weak intermolecular attractions favour ideality.

JEE Main Chemistry · States of Matter · Very Very Hard

14. The van der Waals constant a corrects mainly for:

  • A. Molar mass
  • B. Intermolecular attractions
  • C. Molecular volume
  • D. Temperature
Answer: B
Explanation: Attractions reduce measured pressure relative to ideal behaviour.

JEE Main Chemistry · States of Matter · Very Very Hard

15. The van der Waals constant b corrects mainly for:

  • A. Finite molecular volume
  • B. Attractive forces
  • C. Temperature
  • D. Pressure units
Answer: A
Explanation: b represents excluded volume.

JEE Main Chemistry · States of Matter · Very Very Hard

16. For an ideal gas, compressibility factor Z equals:

  • A. 0
  • B. RT
  • C. Infinity
  • D. 1
Answer: D
Explanation: Z=PV/nRT=1 for an ideal gas.

JEE Main Chemistry · States of Matter · Very Very Hard

17. A real gas with Z<1 is dominated relatively by:

  • A. No interactions
  • B. Nuclear forces
  • C. Attractive interactions
  • D. Repulsive interactions
Answer: C
Explanation: Attractions make PV smaller than ideal.

JEE Main Chemistry · States of Matter · Very Very Hard

18. A real gas with Z>1 shows dominant:

  • A. Condensation only
  • B. Repulsive effects
  • C. Attractive effects
  • D. No molecular volume
Answer: B
Explanation: Repulsive/excluded-volume effects raise PV relative to ideal.

JEE Main Chemistry · States of Matter · Very Very Hard

19. Critical temperature is the temperature:

  • A. Above which a gas cannot be liquefied by pressure alone
  • B. Below which no liquid exists
  • C. At which pressure is zero
  • D. At which ideality is exact
Answer: A
Explanation: Above Tc no amount of pressure alone produces liquefaction.

JEE Main Chemistry · States of Matter · Very Very Hard

20. A gas is most easily liquefied when intermolecular forces are:

  • A. Weak
  • B. Absent
  • C. Purely repulsive
  • D. Strong
Answer: D
Explanation: Stronger attractions favour condensation.

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States of Matter Practice Tests

States of Matter Frequently Asked Questions

How should I prepare States of Matter for JEE Main Chemistry?

Revise the core concepts first, make a short list of important relationships or exceptions, and then solve chapter-focused MCQs while reviewing every error.

How can ChemNexa help with States of Matter practice?

This page provides public sample questions and links to published ChemNexa tests so you can combine quick revision with structured practice.

What should I do after getting an MCQ wrong?

Identify whether the mistake came from a concept gap, calculation, unit, sign, wording or memory error, review that point, and then attempt a similar question again.

Continue with another chapter to build connected concepts and strengthen your overall Chemistry preparation.

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