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Class 11 Chemistry — Chapter 1: Some Basic Concepts of Chemistry Online Test

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Class 11 Chemistry: Some Basic Concepts of Chemistry 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. In the combustion of methane, , if 16 g CH₄ and 64 g O₂ are used, the limiting reagent is:

2 / 20

2. In the reaction , how many grams of AlCl₃ are produced from 54 g of Al?

3 / 20

3. In the reaction , how many moles of water are formed when 4 moles of hydrogen react with excess oxygen?

4 / 20

4. What mass of calcium carbonate is required to produce 44 g of CO₂ on decomposition? Reaction:

5 / 20

5. In the balanced combustion reaction of methane: , what is the coefficient of water?

6 / 20

6. Calculate the percentage of oxygen in water ().

7 / 20

7. In the synthesis of ammonia: , if 10 L of nitrogen is used, what volume of hydrogen is required at STP?

8 / 20

8. What is the atomicity of ammonium nitrate, ?

9 / 20

9. Determine the atomicity of (ammonium sulfate).

10 / 20

10. Which particle is directly rearranged during molecular chemical reactions?

11 / 20

11. Which of the following was a major merit of Dalton’s Atomic Theory?

12 / 20

12. Which of the following provides direct evidence for Avogadro’s Hypothesis?

13 / 20

13. In a closed system, 10 g of hydrogen reacts with 80 g of oxygen. What will be the total mass of water formed?

14 / 20

14. The Law of Definite Proportions states that:

15 / 20

15. According to the Law of Multiple Proportions, the ratios must always be:

16 / 20

16. In the reaction: the ratio of volumes of hydrogen, chlorine, and hydrogen chloride is:

17 / 20

17. What is the molecular mass of ?

18 / 20

18. The number is known as:

19 / 20

19. How many molecules of nitrogen gas are in 28 g of N₂?

20 / 20

20. What is the general formula for percentage composition of an element in a compound?

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Class 11 Chemistry: Some Basic Concepts of Chemistry 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 chemical is commonly used as an octane booster in fuels?

2 / 30

2. Avogadro’s Hypothesis states that:

3 / 30

3. Which experimental evidence supports Dalton’s Law of Multiple Proportions?

4 / 30

4. In determining empirical formula, why is the assumption of 100 g sample useful?

5 / 30

5. Which compound has 53.3% oxygen by mass?

6 / 30

6. What does the term atomicity refer to?

7 / 30

7. What is the percentage composition of nitrogen in ammonia ()?

8 / 30

8. The formula for percentage yield is:

9 / 30

9. Which of the following is not true about molecular mass?

10 / 30

10. What is meant by molecular mass of a substance?

11 / 30

11. Which equation best illustrates a chemical reaction at the atomic level?

12 / 30

12. In a reaction, 5 g of calcium reacts with 2 g of oxygen to form calcium oxide. The mass of CaO produced will be:

13 / 30

13. Which statement is true about empirical and molecular formulas?

14 / 30

14. Which chemical compound is responsible for the pungent smell of onions?

15 / 30

15. Dalton’s theory helped chemistry advance because it:

16 / 30

16. How many liters of oxygen gas are present at STP in 0.5 mole?

17 / 30

17. In the reaction of carbon monoxide and oxygen: , the volume ratio of CO : O₂ : CO₂ is:

18 / 30

18. Which law explains why all gases occupy 22.4 L per mole at STP?

19 / 30

19. Which of the following correctly expresses the relation between moles and mass?

20 / 30

20. Why is the empirical formula important in chemistry?

21 / 30

21. If boron has two isotopes B-10 (20% abundance) and B-11 (80% abundance), what is its average atomic mass?

22 / 30

22. If a compound has empirical formula CH and molar mass 78 g/mol, what is the molecular formula?

23 / 30

23. The molecular formula of benzene is C₆H₆. Its empirical formula is:

24 / 30

24. Which chemical is responsible for the preservation of food in pickles?

25 / 30

25. Which of the following compounds has the same empirical and molecular formula?

26 / 30

26. What is the relation between a molecular formula and an empirical formula?

27 / 30

27. How many molecules of nitrogen gas are in 28 g of N₂?

28 / 30

28. Which chemical process is the basis of the cement industry?

29 / 30

29. Which of the following shows chemistry’s importance in modern agriculture?

30 / 30

30. What is the mass of 5.6 L of oxygen gas at STP? (Molar mass = 32 g/mol)

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Class 11 Chemistry: Some Basic Concepts of Chemistry 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!

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

Good luck! 👍

1 / 50

1. Which of the following statements from Dalton’s theory is still valid today?

2 / 50

2. If 88 g of CO₂ are taken, how many moles are present? (Molar mass of CO₂ = 44 g/mol)

3 / 50

3. Which phenomenon (same molecular formula, different properties) Dalton’s theory could not explain?

4 / 50

4. The concept of alloys like brass and bronze shows the relation of chemistry with:

5 / 50

5. How many atoms are present in 2 moles of aluminium?

6 / 50

6. A sample of CO₂ obtained from coal combustion contains 27.3% carbon and 72.7% oxygen. Another sample of CO₂ from fermentation contains 27.3% carbon and 72.7% oxygen. This confirms:

7 / 50

7. If the mole ratios are not whole numbers (e.g., 1 : 1.5 : 2), what should be done?

8 / 50

8. What mass of carbon dioxide is present in 2 moles?

9 / 50

9. What is the empirical formula of acetic acid ()?

10 / 50

10. Why is the molar volume of gases important in chemical calculations?

11 / 50

11. If a compound has empirical formula CH and molar mass 78 g/mol, what is the molecular formula?

12 / 50

12. Which observation about isotopes exposes a limitation of Dalton’s “identical properties” postulate?

13 / 50

13. Which of the following correctly gives the percentage composition of oxygen in sulphur dioxide ()?

14 / 50

14. Which chemical is commonly used as an octane booster in fuels?

15 / 50

15. Which statement is true regarding the Law of Definite Proportions?

16 / 50

16. A compound contains 80% carbon and 20% hydrogen by mass. What is its empirical formula?

17 / 50

17. How many liters of hydrogen gas at STP are produced when 2 g of hydrogen is taken? (Molar mass H₂ = 2 g/mol)

18 / 50

18. The Haber process for ammonia synthesis demonstrates chemistry’s role in which field?

19 / 50

19. Which interdisciplinary area combines chemistry and physics for medical imaging technologies like MRI?

20 / 50

20. What volume will 3.5 moles of O₂ gas occupy at STP?

21 / 50

21. Which of the following is an industrial use of sulphuric acid, often called the “king of chemicals”?

22 / 50

22. Dalton did not distinguish clearly between atoms and molecules (e.g., he treated elemental gases as monatomic). Which idea resolved this?

23 / 50

23. Which of the following is not an importance of chemistry in everyday life?

24 / 50

24. In CO and CO₂, 12 g of carbon combines with 16 g and 32 g of oxygen, respectively. The ratio of masses of oxygen combining with the same mass of carbon is:

25 / 50

25. Which postulate forms the basis of the Law of Definite Proportions?

26 / 50

26. Which of the following processes demonstrates the combined role of chemistry and biology?

27 / 50

27. Which branch of chemistry is most relevant for developing renewable energy technologies like solar cells?

28 / 50

28. What is meant by the molar volume of a gas at STP?

29 / 50

29. Why are noble gases (e.g., Ar, Ne) classified as atoms rather than molecules?

30 / 50

30. Which compound has 53.3% oxygen by mass?

31 / 50

31. What is the relation between 1 mole of carbon-12 atoms and amu?

32 / 50

32. What is the percentage of carbon in carbon dioxide ()?

33 / 50

33. Which information cannot be obtained directly from the molecular formula?

34 / 50

34. Chlorine occurs in two isotopes: Cl-35 (75% abundance) and Cl-37 (25% abundance). What is the average atomic mass of chlorine?

35 / 50

35. Which chemical is commonly used as an artificial sweetener in food products?

36 / 50

36. What is meant by theoretical yield of a chemical reaction?

37 / 50

37. Which statement is true about formula mass?

38 / 50

38. What is the molecular mass of ?

39 / 50

39. Which is the first requirement to determine molecular formula experimentally?

40 / 50

40. In H₂O, 2 g of hydrogen combines with 16 g of oxygen. In H₂S, 2 g of hydrogen combines with 32 g of sulphur. According to Richter’s law, the ratio of masses of oxygen and sulphur that combine with each other should be:

41 / 50

41. Which compound is often cited as an example of the Law of Definite Proportions?

42 / 50

42. Which is the correct molecular mass of ammonia ()?

43 / 50

43. What is meant by molecular mass of a substance?

44 / 50

44. What is the stoichiometric coefficient of CO₂ in the equation ?

45 / 50

45. Which of the following is true about the relation between mole, mass, and volume?

46 / 50

46. Which contribution of Dalton’s theory led to the calculation of relative atomic masses?

47 / 50

47. Which branch of physics directly supports chemistry in explaining atomic orbitals?

48 / 50

48. Which chemical compound is responsible for the pungent smell of onions?

49 / 50

49. What is the mass of 5.6 L of oxygen gas at STP? (Molar mass = 32 g/mol)

50 / 50

50. Which of the following pairs correctly shows “atom vs molecule”?

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Practice Some Basic Concepts of Chemistry MCQs
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Class 11 Chemistry: Chapter 1 — Some Basic Concepts of Chemistry Online Test

The Class 11 Chemistry: Chapter 1 – Some Basic Concepts of Chemistry Online Test provides a comprehensive pool of 394 MCQs designed to test and enhance your understanding of fundamental concepts in Chemistry. This test is free, CBSE/NCERT-aligned, and helps you assess your grasp on the key topics that form the foundation of the subject. With three difficulty levels, you can progressively challenge yourself and track your improvement over time.

What is this Chapter 1 Online Test?

This test contains three exam-style MCQ papers for Chapter 1: Some Basic Concepts of Chemistry:

  • 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 ~394 questions
  • Paper 3 (Hard) — Challenge: 50 questions · 75 min · Pass 70% · Randomized from the same pool + Certificate on pass

Note: Each paper is timed, auto-evaluated, and displays your score with answer reviews right after submission.

Topics covered in these online tests

In this test, you will practice essential topics from Chapter 1: Some Basic Concepts of Chemistry, which include:

  • Importance of Chemistry — Introduction to Chemistry, its relevance in real life and scientific advancements
  • Laws of Chemical Combination — Law of Mass Conservation, Law of Definite Proportions
  • Dalton’s Atomic Theory — Basic postulates, understanding atoms, and molecules
  • Mole Concept — Mole, Avogadro’s Number, Concept of Molar Mass, and Concept of Chemical Calculations
  • Molar Mass — Determining molar mass and its importance in chemical reactions
  • Percentage Composition — Calculation of percentage composition of compounds
  • Empirical & Molecular Formula — Concepts of empirical formula and molecular formula derivation
  • Stoichiometry — Concept of limiting reagent, and calculation of quantities involved in chemical reactions
  • Limiting Reagent — Importance in chemical reactions and stoichiometric calculations

How This Exam-Style Online Test Works

  • Pick a paper → Answer MCQs within time → Submit → Get instant score and answer review.
  • Timed MCQs: The test is timed, with Paper 1 being 30 minutes, Paper 2 being 45 minutes, and Paper 3 being 75 minutes.
  • Instant Feedback: After each paper, view your score along with a detailed summary and answer explanation.
  • Unlimited Retakes: You can retake the test as many times as you like, with fresh questions in Paper 2 and Paper 3.
  • Certificate: You will earn a certificate after passing Paper 3 with a score of 70% or more.

Who Can Take This Test?

  • Class 11 CBSE/NCERT students who are preparing for unit tests, mid-term exams, or final exams.
  • Students seeking to build a strong foundation in Chemistry for JEE/NEET or other competitive exams.
  • School students who need extra practice and want to assess their understanding of Chapter 1.
  • Teachers and tutors who want to provide students with extra practice and assess their skills.
  • Self-learners and home-schoolers who want a structured, easy-to-use resource to practice Chapter 1 topics.

Advantages of this Online Test

  • Real exam feel: Timed questions and instant feedback help you practice effectively under exam-like conditions.
  • Step-up difficulty: Start with easy questions in Paper 1, move to medium in Paper 2, and take the final challenge in Paper 3.
  • Unlimited attempts: Practice as many times as you like to perfect your skills and improve your score.
  • Completely free: No fees, no charges—just unlimited access to the online test.

How This Test Helps You Study Better

  • Step 1 – Concept Check: Take Paper 1 to check your understanding of basic concepts.
  • Step 2 – Reinforce Learning: Attempt Paper 2 for a mix of concept and numerical questions.
  • Step 3 – Challenge Yourself: Attempt Paper 3 to assess your readiness for exams.
  • Step 4 – Review: Carefully analyze your results and revisit concepts you missed.

Important Notes (Read Before You Start)

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  • Best experience: Use a stable internet connection and the latest browser for the best performance.
  • Allow cookies / local storage to save your progress and results.
  • Safety: This test is 100% free, and there are no hidden charges.

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