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

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

States of Matter: Gases and Liquids is part of WBCHSE 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.

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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

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What to practise in States of Matter: Gases and Liquids

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

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

1. Boyle's law for a fixed amount of gas at constant temperature is:

  • A. P/T = constant
  • B. P/V = constant
  • C. PV = constant
  • D. V/T = constant
Answer: C
Explanation: At constant temperature, pressure varies inversely with volume.

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

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

  • A. Density
  • B. Absolute temperature
  • C. Pressure
  • D. Molar mass
Answer: B
Explanation: For a fixed amount of gas, V/T is constant at constant pressure.

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

3. Gay-Lussac's pressure law at constant volume gives:

  • A. P/T = constant
  • B. PV = constant
  • C. V/T = constant
  • D. P×T = constant
Answer: A
Explanation: Pressure is directly proportional to absolute temperature at constant volume.

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

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

  • A. Molar mass
  • B. Pressure
  • C. Density
  • D. Number of moles
Answer: D
Explanation: Equal volumes at the same T and P contain equal numbers of molecules.

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

5. The ideal gas equation is:

  • A. PV=RT/n
  • B. PVT=nR
  • C. PV=nRT
  • D. P=nR/V
Answer: C
Explanation: The combined gas laws lead to PV=nRT.

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

6. The SI unit of pressure is:

  • A. mm Hg
  • B. Pascal
  • C. Atmosphere
  • D. Torr
Answer: B
Explanation: The pascal is the SI derived unit of pressure.

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

7. One atmosphere is approximately:

  • A. 760 mm Hg
  • B. 76 mm Hg
  • C. 7600 mm Hg
  • D. 1 mm Hg
Answer: A
Explanation: Standard atmospheric pressure is approximately 760 mm Hg.

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

8. Gas density in terms of molar mass M is:

  • A. d=RT/PM
  • B. d=P/RTM
  • C. d=MRT/P
  • D. d=PM/RT
Answer: D
Explanation: Using PV=nRT and n=m/M gives d=m/V=PM/RT.

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

9. At fixed temperature and pressure, density of an ideal gas is directly proportional to:

  • A. Gas constant
  • B. Inverse pressure
  • C. Molar mass
  • D. Volume
Answer: C
Explanation: From d=PM/RT, density is proportional to molar mass.

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

10. Dalton's law states that total pressure of non-reacting gases equals:

  • A. Largest partial pressure
  • B. Sum of partial pressures
  • C. Product of partial pressures
  • D. Mean partial pressure
Answer: B
Explanation: Each gas contributes independently to the total pressure.

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

11. The partial pressure of a component in an ideal gas mixture is:

  • A. Pi=XiP
  • B. Pi=P/Xi
  • C. Pi=Xi/P
  • D. Pi=P-Xi
Answer: A
Explanation: Partial pressure equals mole fraction times total pressure.

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

12. A gas collected over water has dry-gas pressure equal to:

  • A. Total pressure plus water vapour pressure
  • B. Water vapour pressure only
  • C. Total pressure always
  • D. Total pressure minus water vapour pressure
Answer: D
Explanation: The measured total pressure includes both gas and water vapour.

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

13. According to kinetic theory, ideal gas molecules are in:

  • A. Fixed circular paths
  • B. Only translational motion downward
  • C. Continuous random motion
  • D. Complete rest
Answer: C
Explanation: Gas molecules move continuously and randomly.

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

14. Ideal-gas molecular collisions are assumed to be:

  • A. Nuclear
  • B. Perfectly elastic
  • C. Perfectly inelastic
  • D. Impossible
Answer: B
Explanation: No net kinetic energy is lost in ideal elastic collisions.

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

15. The average translational kinetic energy of an ideal gas depends only on:

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

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

16. At the same temperature, H2 and O2 have equal:

  • A. RMS speed
  • B. Average momentum
  • C. Density
  • D. Average translational kinetic energy
Answer: D
Explanation: Average molecular kinetic energy depends only on temperature.

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

17. The RMS speed of gas molecules is:

  • A. sqrt(RT/3M)
  • B. RT/M
  • C. sqrt(3RT/M)
  • D. 3RT/M
Answer: C
Explanation: Root-mean-square speed is √(3RT/M).

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

18. At the same temperature, the lighter gas has:

  • A. Zero RMS speed
  • B. Greater RMS speed
  • C. Lower RMS speed
  • D. Same RMS speed
Answer: B
Explanation: RMS speed varies inversely as square root of molar mass.

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

19. For a Maxwell distribution, the speed order is:

  • A. urms > uavg > ump
  • B. ump > uavg > urms
  • C. uavg > urms > ump
  • D. All equal
Answer: A
Explanation: RMS speed is greatest, followed by average and most probable speeds.

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

20. Graham's law gives diffusion rate proportional to:

  • A. M
  • B. sqrt(M)
  • C. 1/M²
  • D. 1/sqrt(M)
Answer: D
Explanation: Lighter gases diffuse faster, with rate inversely proportional to √M.

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States of Matter: Gases and Liquids Practice Tests

States of Matter: Gases and Liquids Frequently Asked Questions

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