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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. A balloon filled with 2 mol of H₂ and 2 mol of O₂ is at 300 K and 5 atm total pressure. What is the partial pressure of H₂?

2 / 30

2. The functioning of LCD screens is based on:

3 / 30

3. Which of the following correctly relates root mean square speed to pressure equation?

4 / 30

4. Which factor increases both melting and boiling points of a substance?

5 / 30

5. Mountaineers experience breathing difficulties at high altitude mainly due to:

6 / 30

6. The work required to increase the surface area of a liquid by 1 unit is equal to:

7 / 30

7. What happens to the viscosity of liquids when strong intermolecular hydrogen bonding is present?

8 / 30

8. Which additional application of supercritical fluids is correct?

9 / 30

9. If a gas mixture contains 3 mol of , 1 mol of , and 2 mol of , and total pressure is 6 atm, what is the partial pressure of ?

10 / 30

10. Why does a soft drink fizz more when opened at room temperature compared to when it is chilled?

11 / 30

11. In Andrews’ experiment, what happened to CO₂ when pressure was increased at a temperature below its critical temperature?

12 / 30

12. Which postulate of the kinetic molecular theory explains the pressure exerted by gases?

13 / 30

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

14 / 30

14. At what temperature will the average kinetic energy of oxygen molecules be twice that at 300 K?

15 / 30

15. Which of the following correctly matches the gas speeds?

16 / 30

16. Which property enables gases to be stored in large amounts in small steel cylinders?

17 / 30

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

18 / 30

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

19 / 30

19. The critical volume () is:

20 / 30

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

21 / 30

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

22 / 30

22. A 1:1 mixture of H₂ (M = 2) and CH₄ (M = 16) diffuses through a porous plug. What is the relative rate of diffusion of the mixture compared to O₂ (M = 32)?

23 / 30

23. Which of the following gases will have the same average kinetic energy at 300 K?

24 / 30

24. At very low pressures, the compressibility factor of real gases approaches unity because:

25 / 30

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

26 / 30

26. Which intermolecular force is the weakest?

27 / 30

27. Why does boiling point increase as we move from helium to xenon among noble gases?

28 / 30

28. Which device demonstrates Gay Lussac’s law in everyday life?

29 / 30

29. Which gas law relates pressure and volume at constant temperature?

30 / 30

30. Which condition is essential for the validity of Gay Lussac’s law?

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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. According to kinetic theory, the average kinetic energy of gas molecules is directly proportional to:

2 / 50

2. Which real-life application uses cholesteric liquid crystals?

3 / 50

3. The most common supercritical fluid used in food and pharmaceutical industries is:

4 / 50

4. Which of the following correctly relates root mean square speed to pressure equation?

5 / 50

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

6 / 50

6. Which of the following is the correct dimension of the term in the pressure equation?

7 / 50

7. Which intermolecular force plays the major role in dissolving NaCl in water?

8 / 50

8. Which intermolecular force is primarily responsible for the liquefaction of nonpolar gases like and ?

9 / 50

9. In which state is surface tension a characteristic, macroscopically measurable property of the bulk phase?

10 / 50

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

11 / 50

11. Vapour pressure of a liquid is defined as:

12 / 50

12. Which gas behaves most ideally under ordinary conditions?

13 / 50

13. The minimum point in a vs curve (below unity) corresponds to:

14 / 50

14. A 5 L container has a mixture of 2 mol of O₂ and 3 mol of N₂ at 300 K. Calculate the total pressure of the gas mixture. ( L·atm·K⁻¹·mol⁻¹)

15 / 50

15. A binary mixture of and effuses times faster than pure at the same and . What is the mole fraction of in the mixture?

16 / 50

16. Which application of gas laws explains why patients are given oxygen under high pressure in hyperbaric chambers?

17 / 50

17. Which has stronger intermolecular forces: or ?

18 / 50

18. Which property of nematic liquid crystals is primarily exploited in LCD screens?

19 / 50

19. Why does a soft drink fizz more when opened at room temperature compared to when it is chilled?

20 / 50

20. Why does vapour pressure increase rapidly with temperature?

21 / 50

21. Which formula relates partial pressure of a gas to its mole fraction?

22 / 50

22. Which row correctly matches “shape–volume” for the three states?

23 / 50

23. When repulsive forces dominate over attractive forces in a gas, what happens to compressibility factor ?

24 / 50

24. Which property of supercritical fluids is closer to gases?

25 / 50

25. A gas has a volume of 500 mL at 27°C. What will be its volume at 127°C if pressure is constant?

26 / 50

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

27 / 50

27. At 100 °C, water boils because:

28 / 50

28. Why does butter remain solid in a refrigerator but melt at room temperature?

29 / 50

29. Which intermolecular force is strongest among the following interactions?

30 / 50

30. A gas has density at STP. Its molar mass is approximately:

31 / 50

31. Two gases diffuse through a porous membrane. If H₂ diffuses 4 times faster than gas X, what is the molar mass of X?

32 / 50

32. The bends (decompression sickness) in divers is caused mainly due to:

33 / 50

33. Which of the following gases shows the largest deviation in compressibility factor due to hydrogen bonding?

34 / 50

34. Which assumption of kinetic theory explains why gases have neither definite shape nor definite volume?

35 / 50

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

36 / 50

36. At what temperature will the average kinetic energy of oxygen molecules be twice that at 300 K?

37 / 50

37. Which gas law explains why lungs may overexpand and rupture if a scuba diver ascends too quickly?

38 / 50

38. A balloon filled with 2 mol of H₂ and 2 mol of O₂ is at 300 K and 5 atm total pressure. What is the partial pressure of H₂?

39 / 50

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

40 / 50

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

41 / 50

41. In the smectic phase of liquid crystals, molecules are:

42 / 50

42. Which of the following best describes the nematic liquid crystal phase?

43 / 50

43. Which of the following correctly matches the gas speeds?

44 / 50

44. Which important conclusion arises from the derivation of the pressure equation?

45 / 50

45. Which of the following substances lowers surface tension when added to water?

46 / 50

46. Which gas shows the greatest deviation from ideal behavior?

47 / 50

47. Order the intermolecular forces from weakest to strongest:

48 / 50

48. According to Avogadro’s law, equal volumes of gases at the same temperature and pressure contain:

49 / 50

49. 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?

50 / 50

50. Why does graphite have a very high melting point?

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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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