CN  ChemNexa

States of Matter: Gases and Liquids CBSE Class 11 MCQ & Practice Questions

Practice States of Matter: Gases and Liquids MCQs for CBSE Class 11 Chemistry with answers, explanations, chapter revision and related ChemNexa mock tests.

Register Free for Full Chemistry Practice

States of Matter: Gases and Liquids Revision Guide for CBSE Class 11 Chemistry

States of Matter: Gases and Liquids is part of CBSE Class 11 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: Gases and Liquids, then test recall with mixed MCQs.

What to practise in States of Matter: Gases and Liquids

Concept Revision

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

Exam-style MCQs

Use chapter-focused multiple-choice practice to improve accuracy, recall and application for CBSE Class 11 Chemistry.

Performance Practice

Attempt ChemNexa tests, review results and return to weak areas for another round of targeted revision.

Top 20 States of Matter: Gases and Liquids MCQs with Answers

These public questions are selected from the exact States of Matter: Gases and Liquids 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.

CBSE Class 11 Chemistry · States of Matter: Gases and Liquids · Very Very Hard

1. Boyle's law is represented by:

  • A. V ∝ P
  • B. V ∝ 1/P at constant T
  • C. P ∝ T at constant V
  • D. V ∝ T at constant P
Answer: B
Explanation: At constant temperature, pressure is inversely proportional to volume.

CBSE Class 11 Chemistry · States of Matter: Gases and Liquids · Very Very Hard

2. Charles' law states that at constant pressure:

  • A. V ∝ T(K)
  • B. V ∝ 1/T
  • C. P ∝ V
  • D. PV is constant
Answer: A
Explanation: Gas volume is directly proportional to absolute temperature.

CBSE Class 11 Chemistry · States of Matter: Gases and Liquids · Very Very Hard

3. The combined gas law is:

  • A. P₁V₁/T₁ = P₂V₂/T₂
  • B. P₁/T₁ = V₂/P₂
  • C. P₁V₂ = P₂V₁
  • D. V₁T₁ = V₂T₂
Answer: A
Explanation: For a fixed amount of gas, PV/T remains constant.

CBSE Class 11 Chemistry · States of Matter: Gases and Liquids · Very Very Hard

4. The ideal gas equation is:

  • A. PV = RT
  • B. PV = nRT
  • C. P = nRTV
  • D. V = PRT/n
Answer: B
Explanation: For n moles of an ideal gas, PV = nRT.

CBSE Class 11 Chemistry · States of Matter: Gases and Liquids · Very Very Hard

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

  • A. 11.2 L
  • B. 22.4 L
  • C. 24.5 L
  • D. 44.8 L
Answer: B
Explanation: At 273.15 K and 1 atm, molar volume is about 22.4 L.

CBSE Class 11 Chemistry · States of Matter: Gases and Liquids · Very Very Hard

6. The SI unit of pressure is:

  • A. atm
  • B. bar
  • C. pascal
  • D. torr
Answer: C
Explanation: The SI unit of pressure is pascal (Pa).

CBSE Class 11 Chemistry · States of Matter: Gases and Liquids · Very Very Hard

7. 1 atm is approximately equal to:

  • A. 76 mm Hg
  • B. 760 mm Hg
  • C. 7600 mm Hg
  • D. 1 mm Hg
Answer: B
Explanation: 1 atm = 760 mm Hg.

CBSE Class 11 Chemistry · States of Matter: Gases and Liquids · Very Very Hard

8. Dalton's law of partial pressures applies to:

  • A. Reactive gas mixtures only
  • B. Non-reacting gas mixtures
  • C. Liquids only
  • D. Solids only
Answer: B
Explanation: Total pressure equals the sum of partial pressures of non-reacting gases.

CBSE Class 11 Chemistry · States of Matter: Gases and Liquids · Very Very Hard

9. The partial pressure of a gas in a mixture is:

  • A. xᵢPtotal
  • B. Ptotal/xᵢ
  • C. xᵢ/V
  • D. nRT only
Answer: A
Explanation: pᵢ = xᵢPtotal for an ideal mixture.

CBSE Class 11 Chemistry · States of Matter: Gases and Liquids · Very Very Hard

10. Graham's law states that rate of diffusion is inversely proportional to:

  • A. Molar mass
  • B. Square root of molar mass
  • C. Pressure
  • D. Temperature
Answer: B
Explanation: r ∝ 1/√M.

CBSE Class 11 Chemistry · States of Matter: Gases and Liquids · Very Very Hard

11. Which gas diffuses fastest?

  • A. H₂
  • B. N₂
  • C. O₂
  • D. CO₂
Answer: A
Explanation: Hydrogen has the lowest molar mass and therefore the highest diffusion rate.

CBSE Class 11 Chemistry · States of Matter: Gases and Liquids · Very Very Hard

12. According to kinetic theory, average kinetic energy of gas molecules depends only on:

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

CBSE Class 11 Chemistry · States of Matter: Gases and Liquids · Very Very Hard

13. At the same temperature, H₂ and O₂ molecules have the same:

  • A. Average speed
  • B. RMS speed
  • C. Average kinetic energy
  • D. Momentum
Answer: C
Explanation: Average kinetic energy depends only on temperature.

CBSE Class 11 Chemistry · States of Matter: Gases and Liquids · Very Very Hard

14. The RMS speed of a gas is proportional to:

  • A. √(T/M)
  • B. T/M
  • C. M/T
  • D. √(M/T)
Answer: A
Explanation: u_rms = √(3RT/M).

CBSE Class 11 Chemistry · States of Matter: Gases and Liquids · Very Very Hard

15. For the same gas, RMS speed increases when:

  • A. Temperature decreases
  • B. Temperature increases
  • C. Pressure alone increases at constant T
  • D. Molar mass increases
Answer: B
Explanation: u_rms ∝ √T.

CBSE Class 11 Chemistry · States of Matter: Gases and Liquids · Very Very Hard

16. Real gases deviate most from ideal behaviour at:

  • A. Low pressure and high temperature
  • B. High pressure and low temperature
  • C. Low pressure and low temperature
  • D. High temperature only
Answer: B
Explanation: Intermolecular forces and molecular volume become important at high pressure and low temperature.

CBSE Class 11 Chemistry · States of Matter: Gases and Liquids · Very Very Hard

17. The van der Waals constant a corrects for:

  • A. Molecular volume
  • B. Intermolecular attraction
  • C. Gas mass
  • D. Temperature
Answer: B
Explanation: a accounts for attractive forces between molecules.

CBSE Class 11 Chemistry · States of Matter: Gases and Liquids · Very Very Hard

18. The van der Waals constant b corrects for:

  • A. Intermolecular attraction
  • B. Finite molecular volume
  • C. Pressure calibration
  • D. Temperature error
Answer: B
Explanation: b represents excluded volume due to finite molecular size.

CBSE Class 11 Chemistry · States of Matter: Gases and Liquids · Very Very Hard

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

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

CBSE Class 11 Chemistry · States of Matter: Gases and Liquids · Very Very Hard

20. When Z < 1, attractive forces are:

  • A. Negligible
  • B. Dominant
  • C. Repulsive only
  • D. Absent
Answer: B
Explanation: Z below unity indicates that attractions reduce the measured pressure/volume product.

Login to Start Full Test

States of Matter: Gases and Liquids Practice Tests

States of Matter: Gases and Liquids Frequently Asked Questions

How should I prepare States of Matter: Gases and Liquids for CBSE Class 11 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: Gases and Liquids 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.

Continue CBSE Class 11 Chemistry

View all CBSE Class 11 chapters and testsBrowse all Chemistry PracticeCreate a free account