Exam-Style Online Test | Class 11: States Of Matter Test

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. Which statement about densities is correct?

2 / 30

2. A scuba tank has 10 L volume and contains O₂ at 150 atm, 300 K. How many grams of O₂ are present? (R = 0.0821).

3 / 30

3. The diffusion rate of (M=28) compared to (M=44) is:

4 / 30

4. In scuba diving, the composition of compressed air cylinders must consider Dalton’s law because:

5 / 30

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

6 / 30

6. Which condition makes the van der Waals equation reduce to the ideal gas law?

7 / 30

7. Which property of supercritical fluids is closer to liquids?

8 / 30

8. A steel cylinder contains oxygen gas at 10 atm and 300 K. If the cylinder is heated to 600 K without changing volume, what will be the new pressure?

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

11 / 30

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

12 / 30

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

13 / 30

13. How many liters of nitrogen gas at STP contain molecules?

14 / 30

14. The physical state of a substance at a given temperature depends mainly on the balance between:

15 / 30

15. 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)

16 / 30

16. A 10 g sample of helium occupies 5.6 L at STP (273 K, 1 atm). Using ideal gas law, calculate molar mass of helium.

17 / 30

17. The van der Waals equation for real gases is:

18 / 30

18. Which step is essential in deriving the kinetic theory equation for pressure?

19 / 30

19. Which of the following gases cannot be liquefied at room temperature (298 K) by applying pressure?

20 / 30

20. For a gas at constant temperature, when volume decreases by half, pressure:

21 / 30

21. If 5 L of hydrogen reacts with 2.5 L of oxygen at constant T and P, what is the volume of steam formed?

22 / 30

22. If the rms speed of oxygen molecules at 300 K is , what will be their rms speed at 1200 K?

23 / 30

23. In the compressibility curve of hydrogen and helium, the value is always:

24 / 30

24. If for a gas, it means:

25 / 30

25. If for a real gas, this means:

26 / 30

26. Which of the following will have greater thermal energy at the same temperature?

27 / 30

27. A sample of hydrogen gas is collected over water at 25°C. If total pressure is 760 mmHg and vapor pressure of water is 24 mmHg, what is the pressure of hydrogen?

28 / 30

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

29 / 30

29. A vessel contains 1 mol of O₂ and 2 mol of H₂ at 300 K. If total pressure = 9 atm, calculate the partial pressure of O₂.

30 / 30

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

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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. Dalton’s law of partial pressures states that:

2 / 50

2. Why does adding alcohol to water decrease its surface tension?

3 / 50

3. Which conclusion can be drawn from the three types of molecular speeds?

4 / 50

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

5 / 50

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

6 / 50

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

7 / 50

7. Which of the following best explains Brownian motion?

8 / 50

8. 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?

9 / 50

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

10 / 50

10. For nitrogen gas at 300 K, the three molecular speeds are approximately:

11 / 50

11. In liquids, compared to solids, molecules exhibit:

12 / 50

12. Which chemical equation shows the role of surface tension in dissolving detergent micelles?

13 / 50

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

14 / 50

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

15 / 50

15. A gas sample at constant volume has a pressure of 400 mmHg at 200 K. What will be the pressure at 400 K?

16 / 50

16. For a real gas, indicates:

17 / 50

17. Avogadro’s law states that:

18 / 50

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

19 / 50

19. A mixture of 2 mol , 3 mol , and 5 mol exerts 9 atm total pressure. The partial pressure of is:

20 / 50

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

21 / 50

21. Which of the following best explains why gases are compressible but solids are not?

22 / 50

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

23 / 50

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

24 / 50

24. The coefficient of viscosity is related to viscous drag force by the equation:

25 / 50

25. Which practical device works on the principle of Boyle’s law?

26 / 50

26. 1 L of H₂ effuses through a hole in 10 minutes. How long will it take for the same volume of CO₂ (M = 44) under identical conditions?

27 / 50

27. Which of the following best explains why compressibility factor is useful?

28 / 50

28. Which of the following correctly arranges intermolecular forces in increasing order of strength?

29 / 50

29. 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)?

30 / 50

30. Which condition favors ideal behavior most strongly?

31 / 50

31. A sample of methane effuses through a porous plug in 20 s. How long will it take for an equal volume of SO₂ to effuse under same conditions?

32 / 50

32. If the pressure of a fixed mass of gas is plotted against its reciprocal of volume (1/V), the graph is:

33 / 50

33. Which factor does not affect the vapour pressure of a liquid?

34 / 50

34. Hydrogen gas was collected over water at in a inverted jar. Barometric pressure was ; vapour pressure of water at is . How many moles of dry were collected?

35 / 50

35. What happens to the motion of particles when a solid melts into a liquid?

36 / 50

36. Which compound has the highest boiling point due to intermolecular forces?

37 / 50

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

38 / 50

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

39 / 50

39. Which of the following is not an assumption of the kinetic theory of gases?

40 / 50

40. Which statement best describes the internal arrangement (“order”) of particles?

41 / 50

41. The capillary rise of water is due to:

42 / 50

42. Which example demonstrates thermal energy being reduced until intermolecular forces dominate?

43 / 50

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

44 / 50

44. In an experiment, 100 mL of hydrogen diffuses in 25 seconds. How long will it take for the same volume of oxygen () to diffuse under identical conditions?

45 / 50

45. Which equation best describes the boundary between liquid and supercritical fluid?

46 / 50

46. In scuba diving, the composition of compressed air cylinders must consider Dalton’s law because:

47 / 50

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

48 / 50

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

49 / 50

49. Surface tension becomes zero at:

50 / 50

50. Why do molecular solids like naphthalene have relatively low melting points compared to ionic solids?

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Practice States of Matter MCQs
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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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