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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.

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

Good luck! 👍

1 / 30

1. In the steel industry, chemistry is crucial for:

2 / 30

2. Which concept of physics is essential to understand spectroscopy in chemistry?

3 / 30

3. Which atmospheric process is explained through chemistry?

4 / 30

4. What is the mass of water formed when 2 g of H₂ reacts with excess O₂? Reaction:

5 / 30

5. In the combustion of 16 g of CH₄, what is the theoretical yield of CO₂? Reaction:

6 / 30

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

7 / 30

7. What is the atomicity of sulphur in its most stable molecular form?

8 / 30

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

9 / 30

9. The number of oxygen atoms in 18 g of water is:

10 / 30

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

11 / 30

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

12 / 30

12. The Law of Conservation of Mass is not strictly valid in:

13 / 30

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

14 / 30

14. Which property belongs to molecules but not to individual atoms?

15 / 30

15. Which of the following is an example where the molecular and empirical formula are the same?

16 / 30

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

17 / 30

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

18 / 30

18. Which law of chemical combination is directly explained by Dalton’s Atomic Theory?

19 / 30

19. Which environmental issue is directly related to chemical use of chlorofluorocarbons (CFCs)?

20 / 30

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

21 / 30

21. Which equation illustrates a molecular chemical reaction?

22 / 30

22. Who proposed Avogadro’s Hypothesis?

23 / 30

23. Which of the following correctly represents 1 mole of oxygen gas?

24 / 30

24. Which law states: “When two elements combine to form two or more compounds, the masses of one element combining with a fixed mass of the other are in the ratio of small whole numbers”?

25 / 30

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

26 / 30

26. How many grams of oxygen are present in 10 g of water ()?

27 / 30

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

28 / 30

28. In the reaction , if 1 mole C₂H₆ is burned with 2 moles O₂, which is limiting?

29 / 30

29. In 36 g of water, how much hydrogen is present?

30 / 30

30. Which is a polyatomic elemental molecule?

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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 chemical process is the basis of the cement industry?

2 / 50

2. Why is the Law of Definite Proportions important in chemistry?

3 / 50

3. Which law states: “When two elements combine to form two or more compounds, the masses of one element combining with a fixed mass of the other are in the ratio of small whole numbers”?

4 / 50

4. Which of the following is not a limitation of Dalton’s theory (i.e., it is actually a strength/merit)?

5 / 50

5. Where are protons and neutrons located in an atom?

6 / 50

6. Which of the following correctly represents 1 mole of oxygen gas?

7 / 50

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

8 / 50

8. If the empirical formula of a compound is CH₂ and its molar mass is 28 g/mol, what is the molecular formula?

9 / 50

9. Dalton’s postulates emphasized that compounds are formed by:

10 / 50

10. The molecular mass of (ethane) is:

11 / 50

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

12 / 50

12. Two oxides of nitrogen contain 30 g of nitrogen each. In one, oxygen is 34.3 g, and in the other, oxygen is 68.6 g. The ratio of masses of oxygen combining with nitrogen is:

13 / 50

13. Which is correct about molar volume of gases at STP?

14 / 50

14. If 10 g of CaCO₃ is decomposed, what volume of CO₂ at STP is theoretically produced? Reaction:

15 / 50

15. Which of the following statements is false?

16 / 50

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

17 / 50

17. In the reaction , if 1 mole C₂H₆ is burned with 2 moles O₂, which is limiting?

18 / 50

18. How many carbon atoms are in 1 mole of glucose ()?

19 / 50

19. The SI unit of molar mass is:

20 / 50

20. Which of the following is an example where the molecular and empirical formula are the same?

21 / 50

21. The Haber process, an industrial application of equilibrium chemistry, is used to manufacture:

22 / 50

22. Which of the following best distinguishes an atom from a molecule?

23 / 50

23. Which statement about halogens is correct regarding atomicity at standard conditions?

24 / 50

24. Which statement correctly describes molecular composition?

25 / 50

25. In the balanced equation , what is the stoichiometric coefficient of oxygen?

26 / 50

26. Why is Dalton’s Atomic Theory still important today despite its limitations?

27 / 50

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

28 / 50

28. In the reaction , if 5 moles of H₂ and 2 moles of O₂ are mixed, which is the limiting reagent?

29 / 50

29. Which experiment supported Avogadro’s Hypothesis?

30 / 50

30. Who proposed Avogadro’s Hypothesis?

31 / 50

31. In , the percentage of chlorine is:

32 / 50

32. How many molecules are there in 44 g of carbon dioxide (CO₂)?

33 / 50

33. Which of the following particles has the smallest mass in atomic mass units?

34 / 50

34. Which of the following reactions best demonstrates the Law of Conservation of Mass?

35 / 50

35. What is the atomicity of sulphur in its most stable molecular form?

36 / 50

36. What is the mass of calcium present in 50 g of calcium carbonate ()?

37 / 50

37. Which compound has 53.3% oxygen by mass?

38 / 50

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

39 / 50

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

40 / 50

40. The Law of Definite Proportions states that:

41 / 50

41. According to Dalton’s Atomic Theory, matter is composed of:

42 / 50

42. Which of the following is the correct order of steps to determine an empirical formula?

43 / 50

43. Which statement is correct about molar mass?

44 / 50

44. Which branch of science integrates chemistry and biology to study processes such as enzyme action?

45 / 50

45. Which of the following statements is a limitation of Dalton’s postulates?

46 / 50

46. What is meant by the empirical formula of a compound?

47 / 50

47. In NH₃, 14 g of nitrogen combines with 3 g of hydrogen. In H₂O, 16 g of oxygen combines with 2 g of hydrogen. If nitrogen and oxygen combine to form NO, the ratio of oxygen to nitrogen is:

48 / 50

48. Which concept of physics is essential to understand spectroscopy in chemistry?

49 / 50

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

50 / 50

50. Dalton’s Atomic Theory helped in the development of:

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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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