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

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

States of Matter: Gases and Liquids is part of ISC 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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ISC Class 11 Chemistry · States of Matter: Gases and Liquids · Very Hard

1. The pressure of a gas is caused primarily by:

  • A. Mass of container
  • B. Colour of gas
  • C. Collisions of gas molecules with container walls
  • D. Attraction between gas molecules only
Answer: C
Explanation: Gas pressure results from molecular collisions with the walls.

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

2. Boyle's law at constant temperature states that pressure is:

  • A. Proportional to volume squared
  • B. Inversely proportional to volume
  • C. Directly proportional to volume
  • D. Independent of volume
Answer: B
Explanation: For a fixed amount of gas at constant temperature, PV is constant.

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

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

  • A. Absolute temperature
  • B. Celsius temperature directly
  • C. Pressure
  • D. Molar mass
Answer: A
Explanation: V/T remains constant when pressure and amount are fixed.

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

4. Gay-Lussac's pressure law states at constant volume P is proportional to:

  • A. Volume
  • B. Molar mass
  • C. Density only
  • D. Absolute temperature
Answer: D
Explanation: P/T is constant for a fixed amount of gas at constant volume.

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

5. Avogadro's law states equal volumes of gases at the same T and P contain equal:

  • A. Densities
  • B. Molar masses
  • C. Numbers of molecules
  • D. Masses
Answer: C
Explanation: Equal gas volumes under identical conditions contain equal numbers of molecules.

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

6. The ideal gas equation is:

  • A. PVT=nR
  • B. PV=nRT
  • C. P=nRT/V^2
  • D. PV=RT/n
Answer: B
Explanation: Combining fundamental gas laws yields PV=nRT.

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

7. The SI unit of pressure is:

  • A. Pascal
  • B. Atmosphere
  • C. Torr
  • D. Bar
Answer: A
Explanation: The pascal (Pa) is the SI derived unit of pressure.

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

8. One atmosphere is approximately:

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

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

9. The density of an ideal gas may be written as:

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

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

10. At fixed T and P, gas density is proportional to:

  • A. Gas constant
  • B. Molar mass
  • C. Inverse molar mass
  • D. Volume squared
Answer: B
Explanation: d=PM/RT, so at fixed T and P density varies directly with M.

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

11. Dalton's law states total pressure of a non-reacting gas mixture equals:

  • A. Sum of partial pressures
  • B. Product of partial pressures
  • C. Average molecular mass
  • D. Highest partial pressure
Answer: A
Explanation: Each gas contributes independently to total pressure in an ideal mixture.

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

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

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

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

13. A gas collected over water has measured pressure equal to:

  • A. Water vapour pressure only
  • B. Difference always zero
  • C. Dry gas pressure plus water vapour pressure
  • D. Dry gas pressure only
Answer: C
Explanation: The collected gas mixture contains the gas plus water vapour.

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

14. According to kinetic theory, gas molecules are in:

  • A. Only vertical motion
  • B. Continuous random motion
  • C. Complete rest
  • D. Circular fixed orbits
Answer: B
Explanation: Molecules move continuously and randomly.

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

15. In the ideal kinetic model, collisions between gas molecules are:

  • A. Perfectly elastic
  • B. Perfectly inelastic
  • C. Impossible
  • D. Nuclear
Answer: A
Explanation: Ideal-gas collisions conserve total kinetic energy.

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

16. The average translational kinetic energy of ideal gas molecules depends only on:

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

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

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

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

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

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

  • A. Zero rms speed
  • B. Higher rms speed
  • C. Lower rms speed
  • D. Same rms speed always
Answer: B
Explanation: urms is proportional to 1/sqrt(M) at fixed temperature.

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

19. The rms speed of a gas is proportional to:

  • A. Square root of absolute temperature
  • B. Temperature squared
  • C. Inverse temperature
  • D. Pressure only
Answer: A
Explanation: urms=sqrt(3RT/M).

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

20. The correct order of molecular speeds for a gas is:

  • A. ump > uavg > urms
  • B. uavg > urms > ump
  • C. All are equal
  • D. urms > uavg > ump
Answer: D
Explanation: For Maxwell distribution, rms speed exceeds average speed, which exceeds most probable speed.

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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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