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States of Matter — NEET Chemistry Practice MCQs

Topic-wise States of Matter MCQs for NEET aspirants with stepwise answers and clear explanations. Use chapter revision notes and related ChemNexa mock tests.

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States of Matter Revision Guide for NEET Chemistry

States of Matter is part of NEET 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

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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.

NEET Chemistry · States of Matter · Very Hard

1. At constant temperature, the pressure of an ideal gas is doubled. Its volume becomes:

  • A. Four times
  • B. Unchanged
  • C. Half
  • D. Double
Answer: C
Explanation: By Boyle's law, P1V1 = P2V2 at constant temperature. Doubling pressure halves volume.

NEET Chemistry · States of Matter · Very Hard

2. A gas occupies 300 mL at 300 K. At constant pressure, its volume at 450 K is:

  • A. 600 mL
  • B. 200 mL
  • C. 300 mL
  • D. 450 mL
Answer: D
Explanation: By Charles' law, V2 = V1T2/T1 = 300×450/300 = 450 mL.

NEET Chemistry · States of Matter · Very Hard

3. A gas at 1 atm and 300 K is heated to 600 K at constant volume. Its final pressure is:

  • A. 0.5 atm
  • B. 1 atm
  • C. 2 atm
  • D. 4 atm
Answer: C
Explanation: At constant volume, P/T is constant. P2 = 1×600/300 = 2 atm.

NEET Chemistry · States of Matter · Very Hard

4. Which equation represents the combined gas law?

  • A. P1/T1 = P2/T2 only
  • B. V1T1 = V2T2
  • C. P1V1 = P2V2T2
  • D. P1V1/T1 = P2V2/T2
Answer: D
Explanation: For a fixed amount of gas, PV/T remains constant.

NEET Chemistry · States of Matter · Very Hard

5. The value of the gas constant R in L atm mol−1 K−1 is closest to:

  • A. 1.987
  • B. 22.4
  • C. 0.0821
  • D. 8.314
Answer: C
Explanation: R = 0.0821 L atm mol−1 K−1.

NEET Chemistry · States of Matter · Very Hard

6. Which gas diffuses fastest at the same temperature?

  • A. O2
  • B. H2
  • C. He
  • D. N2
Answer: B
Explanation: By Graham's law, rate is inversely proportional to square root of molar mass. H2 has the smallest molar mass.

NEET Chemistry · States of Matter · Very Hard

7. The ratio of diffusion rates of H2 and O2 is:

  • A. 1:4
  • B. 4:1
  • C. 1:16
  • D. 16:1
Answer: B
Explanation: rH2/rO2 = sqrt(32/2) = sqrt(16) = 4.

NEET Chemistry · States of Matter · Very Hard

8. The average kinetic energy of gas molecules depends only on:

  • A. Volume
  • B. Absolute temperature
  • C. Molar mass
  • D. Pressure
Answer: B
Explanation: Average translational kinetic energy is proportional only to absolute temperature.

NEET Chemistry · States of Matter · Very Hard

9. At the same temperature, which gas has the highest root-mean-square speed?

  • A. N2
  • B. CO2
  • C. H2
  • D. He
Answer: C
Explanation: urms = sqrt(3RT/M), so the lowest molar mass gives the highest speed.

NEET Chemistry · States of Matter · Very Hard

10. For an ideal gas, the compressibility factor Z equals:

  • A. Less than 1 always
  • B. 0
  • C. 1
  • D. Greater than 1 always
Answer: C
Explanation: Z = PV/nRT. For an ideal gas, PV = nRT, so Z = 1.

NEET Chemistry · States of Matter · Very Hard

11. A real gas shows positive deviation from ideal behaviour when:

  • A. Repulsive forces dominate
  • B. Attractive forces dominate
  • C. Volume becomes zero
  • D. Temperature is absolute zero
Answer: A
Explanation: Positive deviation, Z > 1, occurs when repulsive interactions dominate.

NEET Chemistry · States of Matter · Very Hard

12. A real gas shows negative deviation from ideal behaviour when:

  • A. Attractive forces dominate
  • B. Pressure is zero
  • C. Molar volume is infinite
  • D. Repulsive forces dominate
Answer: A
Explanation: Negative deviation, Z < 1, occurs when attractive forces dominate.

NEET Chemistry · States of Matter · Very Hard

13. In the van der Waals equation, the constant a corrects for:

  • A. Temperature
  • B. Number of moles
  • C. Molecular volume
  • D. Intermolecular attraction
Answer: D
Explanation: The a term accounts for attractive forces that reduce observed pressure.

NEET Chemistry · States of Matter · Very Hard

14. In the van der Waals equation, the constant b corrects for:

  • A. External pressure
  • B. Intermolecular attraction
  • C. Finite molecular volume
  • D. Kinetic energy
Answer: C
Explanation: The b term represents excluded volume due to finite molecular size.

NEET Chemistry · States of Matter · Very Hard

15. At very low pressure, a real gas behaves nearly ideally because:

  • A. Molecular volume and interactions become negligible
  • B. Molecules stop moving
  • C. Temperature becomes zero
  • D. Pressure corrections dominate
Answer: A
Explanation: At low pressure, molecules are far apart, so attractions and molecular volume are negligible.

NEET Chemistry · States of Matter · Very Hard

16. Which conditions favour liquefaction of a gas?

  • A. Low temperature and high pressure
  • B. High temperature and high pressure only
  • C. Low temperature and low pressure only
  • D. High temperature and low pressure
Answer: A
Explanation: Low temperature reduces kinetic energy and high pressure brings molecules closer, favouring liquefaction.

NEET Chemistry · States of Matter · Very Hard

17. The critical temperature of a gas is the temperature:

  • A. At which pressure becomes zero
  • B. At which molecular motion stops
  • C. Below which it can be liquefied by pressure
  • D. Above which it can be liquefied by pressure
Answer: C
Explanation: A gas can be liquefied by pressure only below its critical temperature.

NEET Chemistry · States of Matter · Very Hard

18. The vapour pressure of a liquid increases with temperature because:

  • A. Molecular mass decreases
  • B. More molecules acquire sufficient kinetic energy to escape
  • C. Intermolecular forces become stronger
  • D. Liquid density always increases
Answer: B
Explanation: Heating increases the fraction of molecules energetic enough to enter the vapour phase.

NEET Chemistry · States of Matter · Very Hard

19. Boiling occurs when vapour pressure becomes equal to:

  • A. Zero
  • B. Atmospheric pressure
  • C. Critical pressure always
  • D. Internal energy
Answer: B
Explanation: A liquid boils when its vapour pressure equals the external pressure.

NEET Chemistry · States of Matter · Very Hard

20. Which liquid is expected to have the highest boiling point?

  • A. NH3
  • B. H2O
  • C. H2S
  • D. CH4
Answer: B
Explanation: Water forms an extensive hydrogen-bonded network, giving the highest boiling point.

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States of Matter Practice Tests

States of Matter Frequently Asked Questions

How should I prepare States of Matter for NEET 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.

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