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Class 11 Chemistry — Chapter 5: States of Matter Online Test

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Class 11 Chemistry: States of Matter Online Test (Paper 1)

Welcome to Paper 1! This is your foundation to build confidence and get you ready to tackle the challenges ahead.

  • Total Questions: 20
  • Time Allotted: 30 minutes
  • Passing Score: 40%
  • Randomization: No
  • Certificate: No
  • Retake: Allowed
  • Price: 100% Free

Good luck! 👍

1 / 20

1. A rigid vessel at contains mol and mol . An electric spark causes complete reaction . After cooling back to , what is the final pressure?

2 / 20

2. Which property makes supercritical fluids useful as solvents in industry?

3 / 20

3. Which curve best represents the relation between vapour pressure and temperature?

4 / 20

4. What is the critical temperature of CO₂ observed in Andrews’ experiments?

5 / 20

5. The van der Waals constant has which units (for 1 mol gas)?

6 / 20

6. Why is added to pressure in the van der Waals equation?

7 / 20

7. At very low pressure, the compressibility factor of a real gas approaches:

8 / 20

8. If for a gas, it means:

9 / 20

9. If hydrogen () has an RMS speed of 1840 m/s at a given temperature, what is the RMS speed of oxygen () at the same temperature?

10 / 20

10. Which relation connects pressure, volume, and average kinetic energy of molecules?

11 / 20

11. Which constant directly connects molecular kinetic energy with absolute temperature?

12 / 20

12. Which assumption of kinetic theory explains the compressibility of gases?

13 / 20

13. Which of the following statements is correct about Dalton’s law?

14 / 20

14. If 3 L of nitrogen gas contains molecules at constant T and P, how many molecules will 6 L of nitrogen contain?

15 / 20

15. Which statement is true about Avogadro’s number ()?

16 / 20

16. The graph of Gay Lussac’s law (Pressure vs Temperature) is:

17 / 20

17. Which everyday example best demonstrates Charles’ law?

18 / 20

18. Boyle’s law is valid under which condition?

19 / 20

19. Which has stronger intermolecular forces: or ?

20 / 20

20. The correct order of diffusion rate at room temperature is:

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Class 11 Chemistry: States of Matter Online Test (Paper 2)

Welcome to Paper 2! You’ve mastered the basics, and now it’s time to test your understanding with a more challenging set of questions.

Get new questions on each attempt

  • Total Questions: 30
  • Time Allotted: 45 minutes
  • Passing Score: 50%
  • Randomization: Yes
  • Certificate: No
  • Retake: Allowed
  • Price: 100% Free

Good luck! 👍

1 / 30

1. Why does the pressure inside a car tire increase when the car is driven for a long distance?

2 / 30

2. Why is the discovery of critical constants important from Andrews’ experiments?

3 / 30

3. How many liters of at and form when decomposes completely?

4 / 30

4. At very low pressure, the compressibility factor of a real gas approaches:

5 / 30

5. Which of the following equations is used to measure viscosity of liquids using capillary flow?

6 / 30

6. In an experiment, two gases diffuse through the same pinhole. If gas A takes 36 s and gas B takes 64 s, the ratio of their molar masses () is:

7 / 30

7. Which type of intermolecular force exists in all substances, regardless of polarity?

8 / 30

8. Which of the following terms refers to the direct conversion of a solid into vapor without passing through the liquid state?

9 / 30

9. Which statement about boiling and evaporation is correct?

10 / 30

10. How does viscosity of a liquid change with temperature?

11 / 30

11. If a gas exerts 760 mmHg pressure at 273 K, what pressure will it exert at 546 K at constant volume?

12 / 30

12. 200 mL of H₂ at 27 °C and 1 atm is mixed with 200 mL of O₂ at 27 °C and 2 atm. The final pressure in 400 mL vessel at 27 °C will be:

13 / 30

13. Which process explains the formation of dew drops on grass in the early morning?

14 / 30

14. Which curve obtained by Andrews is called the "isotherm of critical temperature"?

15 / 30

15. Which of the following liquids forms a convex meniscus in a glass capillary?

16 / 30

16. Why must temperature always be measured in Kelvin when applying Gay Lussac’s law?

17 / 30

17. Why is the critical temperature () important in the liquefaction of gases?

18 / 30

18. Why does ethanol have a lower boiling point than water, even though both exhibit hydrogen bonding?

19 / 30

19. Which of the following is NOT a characteristic property of gases?

20 / 30

20. Which of the following is assumed to remain constant during molecular collisions in kinetic theory?

21 / 30

21. Viscosity of a liquid is defined as:

22 / 30

22. Dalton’s law can be combined with the ideal gas equation to give:

23 / 30

23. Which of the following pairs of quantities always remain constant in Boyle’s law?

24 / 30

24. When ammonia and hydrogen chloride gases diffuse toward each other, a white ring of forms closer to HCl because:

25 / 30

25. Which of the following statements is correct about Dalton’s law?

26 / 30

26. Which relation connects , , and for a van der Waals gas?

27 / 30

27. In deriving pressure, why is the motion of molecules along y and z directions considered?

28 / 30

28. A 2 L container has 0.50 mol of and 0.50 mol of at 300 K. The total pressure is 24.6 atm. What is the partial pressure of each gas?

29 / 30

29. Which assumption of kinetic theory best explains why gases have very low densities compared to liquids and solids?

30 / 30

30. For a real gas, indicates:

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Class 11 Chemistry: States of Matter Online Test (Paper 3)

Welcome to Paper 3! You’ve warmed up—now it's time to step up your game and conquer the challenge with tougher questions!

Earn a certificate upon passing

Get new questions with every attempt

  • Total Questions: 50
  • Time Allotted: 75 minutes
  • Passing Score: 70%
  • Randomization: Yes
  • Certificate: Yes
  • Retake: Allowed
  • Price: 100% Free

Good luck! 👍

1 / 50

1. If 3 L of nitrogen gas contains molecules at constant T and P, how many molecules will 6 L of nitrogen contain?

2 / 50

2. Which application of surface tension is used in medicine?

3 / 50

3. Which critical property primarily determines gas storage safety in pressurized cylinders?

4 / 50

4. Which real-life application uses Graham’s law of diffusion?

5 / 50

5. Which of the following best explains why detergents help in cleaning greasy clothes?

6 / 50

6. At temperatures above the critical temperature, Andrews found that:

7 / 50

7. What causes dipole–dipole interaction strength to increase?

8 / 50

8. Which statement is true about Avogadro’s number ()?

9 / 50

9. Which assumption of kinetic theory is mainly violated when real gases deviate from ideal behavior?

10 / 50

10. Which condition minimizes deviation from ideality caused by both intermolecular forces and molecular volume?

11 / 50

11. A mixture of gases at 27°C and 1 atm contains 0.4 mol of and 0.6 mol of . What is the partial pressure of nitrogen?

12 / 50

12. In the isotherms of CO₂ obtained by Andrews, the horizontal flat portion represents:

13 / 50

13. Why do liquids evaporate even at temperatures below their boiling point?

14 / 50

14. The critical constants () are related to which equation of state?

15 / 50

15. The heat absorbed during the conversion of 1 mole of ice at to water at is called:

16 / 50

16. For an ideal gas, how does the vs plot appear at constant temperature?

17 / 50

17. Why does methane () have a very low boiling point?

18 / 50

18. Which of the following mathematical forms correctly represents Boyle’s law?

19 / 50

19. A 2 L container has 0.50 mol of and 0.50 mol of at 300 K. The total pressure is 24.6 atm. What is the partial pressure of each gas?

20 / 50

20. Which of the following correctly represents enthalpy of sublimation ()?

21 / 50

21. The value of for CO₂ at moderate pressures is often less than 1. This indicates:

22 / 50

22. Which critical constants of CO₂ make it easy to use as a supercritical fluid?

23 / 50

23. At very low pressure, the compressibility factor of a real gas approaches:

24 / 50

24. Which of the following correctly describes motion of gas molecules according to kinetic theory?

25 / 50

25. Why does Dalton’s law hold true for ideal gases?

26 / 50

26. A sample of gas occupies 4.0 L at 2 atm pressure. What will be its volume at 1 atm, keeping temperature constant?

27 / 50

27. Why does high pressure promote liquefaction of gases?

28 / 50

28. Which is the main cause of deviation of real gases from ideal behavior at low temperature?

29 / 50

29. When ammonia and hydrogen chloride gases diffuse toward each other, a white ring of forms closer to HCl because:

30 / 50

30. Why do liquid crystals exhibit anisotropy in electrical and optical properties?

31 / 50

31. What is the critical temperature of CO₂ observed in Andrews’ experiments?

32 / 50

32. Which expression represents the pressure of an ideal gas derived from kinetic theory?

33 / 50

33. At STP, 1 mole of an ideal gas occupies:

34 / 50

34. A gas has a volume of 4.0 L at 27°C. What will be its volume at 127°C, keeping pressure constant?

35 / 50

35. In Andrews’ CO₂ isotherm, what does the portion beyond the horizontal line (on further compression) represent?

36 / 50

36. Graham’s law of diffusion states that the rate of diffusion of a gas is:

37 / 50

37. Which of the following pairs of quantities always remain constant in Boyle’s law?

38 / 50

38. The expression for the most probable speed () is:

39 / 50

39. A 10 L container has 2 mol of N₂ and 3 mol of H₂ at 300 K. A spark is introduced and gases react to form NH₃. If reaction goes to completion, what is the total pressure after cooling to 300 K? ()

40 / 50

40. A sample of NH₃ effuses in 30 seconds. How long will an equal volume of SO₂ take to effuse under same conditions? (M of NH₃ = 17, SO₂ = 64).

41 / 50

41. Why does viscosity of gases increase with temperature, unlike liquids?

42 / 50

42. Why does water exist as a liquid at room temperature while exists as a gas?

43 / 50

43. For a van der Waals gas, the compressibility factor at the critical point is:

44 / 50

44. Which of the following statements is correct for Boyle’s law?

45 / 50

45. A balloon filled with air at 1 atm has a volume of 2.5 L. If the balloon is squeezed until volume becomes 1.25 L, the new pressure inside will be:

46 / 50

46. Which type of intermolecular force exists in all substances, regardless of polarity?

47 / 50

47. Why do small liquid drops form spherical shapes?

48 / 50

48. The critical pressure () is defined as:

49 / 50

49. Why does a football appear deflated when taken out on a cold winter morning?

50 / 50

50. Why is used in the van der Waals equation?

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Practice States of Matter MCQs
Download Class 11 Chemistry MCQ Study Bundle

Class 11 Chemistry — Chapter 5: States of Matter Online Test

Welcome to the Class 11 Chemistry: Chapter 5 – States of Matter Online Test page. This test offers a collection of 494 MCQs that cover the essential concepts of the states of matter, including gases, liquids, and solids. The online test is designed to help you strengthen your understanding and master the key topics in this chapter. It is free, aligned with the CBSE/NCERT curriculum, and available for unlimited attempts. Each paper is timed, and you will get instant feedback after each attempt.

Struggling with the gas laws, or trying to understand intermolecular forces? This test is an excellent way to practice and prepare yourself for upcoming exams. Think of this as your personal online mock test for the States of Matter chapter, available anytime on your phone or computer. Whether you’re a beginner or an advanced learner, you can progress through the Easy, Medium, and Hard levels, and track your improvements as you go.

What is this Class 11 Chemistry: States of Matter Online Test?

This page features three different difficulty levels of the MCQ test for Chapter 5:

  • Paper 1 (Easy) — Foundation: 20 questions · 30 min · Pass 40% · Fixed set
  • Paper 2 (Medium) — Mixed: 30 questions · 45 min · Pass 50% · Randomized from a pool of ~494 questions
  • Paper 3 (Hard) — Challenge: 50 questions · 75 min · Pass 70% · Randomized from the same pool + Certificate on pass

Note: Paper 2 and Paper 3 are randomized, so you’ll get a new set of questions on each attempt. The test is timed, and once you submit your answers, you’ll instantly see your score and a review of your responses.

Topics covered in these online tests

This test focuses on essential topics in Chapter 5, which covers the three states of matter and their properties. The main concepts that you will practice include:

  • Properties of Gases — Ideal gas law, gas laws, Boyle’s law, Charles’ law, and real gases
  • Ideal Gas Equation — PV = nRT, applications of the ideal gas equation
  • Liquids — Properties of liquids, viscosity, surface tension, and capillarity
  • Solids — Properties of solids, crystal lattices, and unit cells
  • Intermolecular Forces — Types of forces, dipole-dipole interactions, hydrogen bonding, London dispersion forces
  • Gas Laws & Kinetic Molecular Theory — Kinetic theory of gases, deviations from ideal gas behavior, Maxwell’s distribution of velocities
  • Liquefaction of Gases — Critical temperature, critical pressure, Van der Waals equation of state
  • Real Gases — Compressibility factor, deviations from ideal gas behavior
  • Surface Chemistry — Adsorption, adsorption isotherms, catalysis

How This Exam-Style Online Test Works

Simple Steps: Select a paper → Answer the questions within the time limit → Submit → View your results instantly with a detailed breakdown.

What you’ll experience in this test

  • MCQs: One question with four possible answers (A, B, C, D).
  • Timer on top: Paper 1: 30 minutes • Paper 2: 45 minutes • Paper 3: 75 minutes.
  • Pagination: Typically 10 questions per page. Use navigation to move between questions.
  • Answer Review: After finishing the test, you’ll receive your score, along with the correct answers and detailed explanations.
  • Instant Feedback: Click View Result to see your score, and review the questions you answered incorrectly.
  • Retake Option: Click Restart Test to try again with a new set of questions (Paper 2 & 3).

Note: Share your feedback on the result page after completing the test to help us improve.

Marking & Pass Criteria

  • Scoring: +1 for every correct answer, 0 for incorrect (no negative marking).
  • Passing Marks: Paper 1 — 40% • Paper 2 — 50% • Paper 3 — 70%.
  • Randomization: Paper 2 & Paper 3 will shuffle questions from a pool of ~494 questions. Paper 1 remains fixed.

Who can take this test?

  • Class 11 CBSE students preparing for unit tests, half-yearlies, and final exams.
  • Class 12 bridge students revising basic concepts of States of Matter.
  • JEE/NEET aspirants focusing on understanding gas laws, properties of gases, and real gases for competitive exams.
  • School teachers / tutors needing a ready-to-use, chapter-specific test for homework, practice, or revision.
  • Self-learners and homeschoolers who wish to test their knowledge and improve concepts.

Benefits of this online test

  • Exam-like experience: Get a feel for timed, exam-style questions with real-time feedback.
  • Instant results: Learn from your mistakes immediately after each attempt.
  • Stepped-up difficulty: Start with the basics, progress to intermediate questions, and challenge yourself with harder ones.
  • Unlimited attempts: Practice as often as you like to improve speed and accuracy.
  • Zero cost: No fees or hidden charges — completely free for all students.

How this test can help you study better

  • Step 1 – Initial understanding: Try Paper 1 to check your knowledge on fundamental concepts.
  • Step 2 – Consolidate learning: Move to Paper 2 (randomized) to cover intermediate-level questions.
  • Step 3 – Challenge yourself: Attempt Paper 3 to strengthen exam-readiness with tougher questions.
  • Step 4 – Review mistakes: Revisit wrong answers, learn from them, and improve your accuracy.

Important Notes (read before starting)

  • Do not refresh or close the test tab to avoid losing progress.
  • Best experience: Use a modern browser (Chrome/Edge), stable internet connection, and a distraction-free environment.
  • Allow cookies / local storage for smooth tracking of progress and results.
  • Safety: This test is 100% FREE, and there are no hidden charges.

Additional Practice for Class 11 Chemistry

To continue your preparation, explore the full collection of Class 11 Chemistry MCQs: Class 11 Chemistry Online Test Index or practice all chapters from the Class 11 Chemistry MCQ Collection.

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