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States of Matter: Gases and Liquids JENPAS MCQ & Practice Questions

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States of Matter: Gases and Liquids Revision Guide for JENPAS Chemistry

States of Matter: Gases and Liquids is part of JENPAS 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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JENPAS Chemistry · States of Matter: Gases and Liquids · Very Very Hard

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

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

JENPAS Chemistry · States of Matter: Gases and Liquids · Very Very Hard

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

  • A. Density
  • B. Absolute temperature
  • C. Pressure
  • D. Molar mass
Answer: B
Explanation: At constant pressure, V is directly proportional to T in kelvin.

JENPAS Chemistry · States of Matter: Gases and Liquids · Very Very Hard

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

  • A. Number of moles
  • B. Molar mass
  • C. Density
  • D. Pressure
Answer: A
Explanation: V is directly proportional to n at constant temperature and pressure.

JENPAS Chemistry · States of Matter: Gases and Liquids · Very Very Hard

4. The ideal gas equation is:

  • A. P=nRT/V^2
  • B. PV=RT/n
  • C. PVT=nR
  • D. PV=nRT
Answer: D
Explanation: The combined gas laws lead to PV=nRT.

JENPAS Chemistry · States of Matter: Gases and Liquids · Very Very Hard

5. For one mole of an ideal gas, compressibility factor Z is:

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

JENPAS Chemistry · States of Matter: Gases and Liquids · Very Very Hard

6. The density of an ideal gas is given by:

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

JENPAS Chemistry · States of Matter: Gases and Liquids · Very Very Hard

7. At the same T and P, gas density is proportional to:

  • A. Molar mass
  • B. Inverse molar mass
  • C. Square root of pressure only
  • D. Universal gas constant
Answer: A
Explanation: d=PM/RT.

JENPAS Chemistry · States of Matter: Gases and Liquids · Very Very Hard

8. Graham's law states diffusion rate is inversely proportional to:

  • A. Molar mass
  • B. Pressure squared
  • C. Temperature
  • D. Square root of molar mass
Answer: D
Explanation: r is proportional to 1/sqrt(M).

JENPAS Chemistry · States of Matter: Gases and Liquids · Very Very Hard

9. Average translational kinetic energy per gas molecule depends only on:

  • A. Molar mass only
  • B. Volume only
  • C. Absolute temperature
  • D. Pressure only
Answer: C
Explanation: Average kinetic energy is (3/2)kT.

JENPAS Chemistry · States of Matter: Gases and Liquids · Very Very Hard

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

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

JENPAS Chemistry · States of Matter: Gases and Liquids · Very Very Hard

11. At the same temperature, a lighter gas has:

  • A. Higher rms speed
  • B. Lower rms speed
  • C. Same rms speed
  • D. Zero rms speed
Answer: A
Explanation: u_rms=sqrt(3RT/M).

JENPAS Chemistry · States of Matter: Gases and Liquids · Very Very Hard

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

  • A. Absolute temperature
  • B. Inverse temperature
  • C. Pressure only
  • D. Square root of absolute temperature
Answer: D
Explanation: For fixed molar mass, u_rms ∝ sqrt(T).

JENPAS Chemistry · States of Matter: Gases and Liquids · Very Very Hard

13. If absolute temperature doubles, rms speed changes by a factor:

  • A. 4
  • B. 1/2
  • C. sqrt(2)
  • D. 2
Answer: C
Explanation: u_rms ∝ sqrt(T).

JENPAS Chemistry · States of Matter: Gases and Liquids · Very Very Hard

14. Correct ordering of molecular speeds is:

  • A. All equal
  • B. u_rms > u_avg > u_mp
  • C. u_mp > u_avg > u_rms
  • D. u_avg > u_rms > u_mp
Answer: B
Explanation: For Maxwell distribution, rms speed exceeds average speed, which exceeds most probable speed.

JENPAS Chemistry · States of Matter: Gases and Liquids · Very Very Hard

15. Most probable speed is:

  • A. sqrt(2RT/M)
  • B. sqrt(3RT/M)
  • C. sqrt(8RT/pi M)
  • D. RT/M
Answer: A
Explanation: u_mp=sqrt(2RT/M).

JENPAS Chemistry · States of Matter: Gases and Liquids · Very Very Hard

16. Average speed of gas molecules is:

  • A. sqrt(2RT/M)
  • B. sqrt(3RT/M)
  • C. 3RT/M
  • D. sqrt(8RT/pi M)
Answer: D
Explanation: The mean speed from Maxwell distribution is sqrt(8RT/pi M).

JENPAS Chemistry · States of Matter: Gases and Liquids · Very Very Hard

17. Root-mean-square speed is:

  • A. sqrt(8RT/pi M)
  • B. RT/M
  • C. sqrt(3RT/M)
  • D. sqrt(2RT/M)
Answer: C
Explanation: u_rms=sqrt(3RT/M).

JENPAS Chemistry · States of Matter: Gases and Liquids · Very Very Hard

18. Gas pressure arises primarily from:

  • A. Molecular rest energy
  • B. Molecular collisions with container walls
  • C. Gravitational force only
  • D. Chemical reaction with walls
Answer: B
Explanation: Pressure results from momentum transfer during wall collisions.

JENPAS Chemistry · States of Matter: Gases and Liquids · Very Very Hard

19. Ideal-gas molecules are assumed to have:

  • A. Negligible intermolecular forces except during collisions
  • B. Strong permanent attractions
  • C. Infinite molecular volume
  • D. Zero kinetic energy
Answer: A
Explanation: The ideal model neglects intermolecular attractions.

JENPAS Chemistry · States of Matter: Gases and Liquids · Very Very Hard

20. Ideal-gas collisions are assumed to be:

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

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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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