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Gaseous State WBJEE MCQ & Practice Questions

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Gaseous State Revision Guide for WBJEE Chemistry

Gaseous State is part of WBJEE 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 Gaseous State, then test recall with mixed MCQs.

What to practise in Gaseous State

Concept Revision

Revise definitions, principles, equations, trends and core ideas from Gaseous State before attempting MCQs.

Exam-style MCQs

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

Performance Practice

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

Top 20 Gaseous State MCQs with Answers

These public questions are selected from the exact Gaseous State 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.

WBJEE Chemistry · Gaseous State · 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 T, PV is constant.

WBJEE Chemistry · Gaseous State · Very Very Hard

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

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

WBJEE Chemistry · Gaseous State · Very Very Hard

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

  • A. Number of moles
  • B. Molar mass
  • C. Density
  • D. Pressure
Answer: A
Explanation: V is proportional to n at fixed T and P.

WBJEE Chemistry · Gaseous State · 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: Combining the elementary gas laws gives PV=nRT.

WBJEE Chemistry · Gaseous State · Very Very Hard

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

  • A. RT
  • B. P/V
  • C. 1
  • D. 0
Answer: C
Explanation: Z=PV/(nRT), so an ideal gas has Z=1.

WBJEE Chemistry · Gaseous State · Very Very Hard

6. The density of an ideal gas is represented 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, d=m/V=PM/RT.

WBJEE Chemistry · Gaseous State · 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.

WBJEE Chemistry · Gaseous State · Very Very Hard

8. Graham's law states that rate of diffusion 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).

WBJEE Chemistry · Gaseous State · Very Very Hard

9. According to kinetic theory, average translational kinetic energy per molecule depends only on:

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

WBJEE Chemistry · Gaseous State · Very Very Hard

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

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

WBJEE Chemistry · Gaseous State · Very Very Hard

11. At the same temperature, the gas with lower molar mass 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).

WBJEE Chemistry · Gaseous State · 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: u_rms is proportional to sqrt(T) for fixed molar mass.

WBJEE Chemistry · Gaseous State · Very Very Hard

13. For a given gas, doubling absolute temperature changes rms speed by a factor:

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

WBJEE Chemistry · Gaseous State · Very Very Hard

14. The 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 a Maxwell distribution, rms > average > most probable speed.

WBJEE Chemistry · Gaseous State · Very Very Hard

15. Most probable speed is given by:

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

WBJEE Chemistry · Gaseous State · Very Very Hard

16. Average molecular speed is:

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

WBJEE Chemistry · Gaseous State · 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).

WBJEE Chemistry · Gaseous State · Very Very Hard

18. Gas pressure in kinetic theory arises from:

  • A. Chemical reaction with walls
  • B. Molecular collisions with container walls
  • C. Attraction to Earth's centre only
  • D. Molecular rest energy
Answer: B
Explanation: Momentum transfer during wall collisions produces pressure.

WBJEE Chemistry · Gaseous State · 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.

WBJEE Chemistry · Gaseous State · Very Very Hard

20. Ideal-gas molecular 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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Gaseous State Practice Tests

Gaseous State Frequently Asked Questions

How should I prepare Gaseous State for WBJEE 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 Gaseous State 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.

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