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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. If 4 g of hydrogen reacts with 32 g of oxygen, which is the limiting reagent in ?

2 / 30

2. Why were Dalton’s postulates revolutionary for his time?

3 / 30

3. Which discovery proved Dalton wrong about atoms of an element being identical?

4 / 30

4. Which atmospheric process is explained through chemistry?

5 / 30

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

6 / 30

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

7 / 30

7. In the reaction , 160 g Fe₂O₃ reacts with 84 g CO. Which is the limiting reagent?

8 / 30

8. Find the percentage of carbon in carbon dioxide ().

9 / 30

9. Sulfur vapour at very high temperature contains . The atomicity of is:

10 / 30

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

11 / 30

11. What is the mass of carbon in 22 g of CO₂?

12 / 30

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

13 / 30

13. How many liters of CO₂ at STP are produced by complete combustion of 1 mole of CH₄? Reaction:

14 / 30

14. Which of the following is true about molecules but not about atoms?

15 / 30

15. Which element pair and common element verify the Law of Reciprocal Proportions?

16 / 30

16. How many grams of CO₂ are produced when 44 g of propane () is completely burnt? Reaction:

17 / 30

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

18 / 30

18. Which modern concept can be seen as a direct extension of the Law of Reciprocal Proportions?

19 / 30

19. Which polymer is commonly used for making plastic bottles?

20 / 30

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

21 / 30

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

22 / 30

22. The molecular mass of (ethane) is:

23 / 30

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

24 / 30

24. Which of the following is a polyatomic molecule?

25 / 30

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

26 / 30

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

27 / 30

27. Which discovery first showed that atoms are divisible, contradicting Dalton’s “indivisible atom” postulate?

28 / 30

28. Why was the concept of atomic mass unit (amu) introduced?

29 / 30

29. Which statement is correct about molar mass?

30 / 30

30. Why is the Law of Multiple Proportions important in chemistry?

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

2 / 50

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

3 / 50

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

4 / 50

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

5 / 50

5. Which of the following correctly represents the atomic composition of oxygen-16?

6 / 50

6. Which statement best summarizes Gay-Lussac’s Law of Gaseous Volumes?

7 / 50

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

8 / 50

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

9 / 50

9. Who is credited with proposing the first modern atomic theory?

10 / 50

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

11 / 50

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

12 / 50

12. In the reaction , what mass of AlCl₃ is formed from 54 g of Al (assuming 100% yield)?

13 / 50

13. Which of the following chemicals is widely used in the fertilizer industry to enhance nitrogen content in soil?

14 / 50

14. Which of the following has the highest molecular mass?

15 / 50

15. The mass of one atom of oxygen-16 isotope is:

16 / 50

16. Which data is essential to calculate an empirical formula?

17 / 50

17. Which of the following molecules is diatomic?

18 / 50

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

19 / 50

19. Which statement is true about formula mass?

20 / 50

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

21 / 50

21. If the empirical formula mass and molecular mass are equal, what does it imply?

22 / 50

22. Which of the following compounds has a molecular mass of 18 u?

23 / 50

23. Which reaction verifies Gay-Lussac’s Law?

24 / 50

24. Why are atoms considered neutral?

25 / 50

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

26 / 50

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

27 / 50

27. Which of the following shows the correct relation between mole and volume of a gas at STP?

28 / 50

28. What is the first step in determining the empirical formula of a compound from experimental data?

29 / 50

29. What is the atomicity of ammonium nitrate, ?

30 / 50

30. Which discovery first showed that atoms are divisible, contradicting Dalton’s “indivisible atom” postulate?

31 / 50

31. Which of the following best describes how Dalton’s theory supported the Law of Multiple Proportions?

32 / 50

32. What is the formula mass of potassium sulfate ()?

33 / 50

33. What is the molar mass of nitrogen gas ()?

34 / 50

34. Which of the following correctly represents the atomicity of ozone?

35 / 50

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

36 / 50

36. Which of the following is not true about molar volume of gases?

37 / 50

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

38 / 50

38. Who is credited with proposing the Law of Conservation of Mass?

39 / 50

39. Why is chemistry considered central among sciences?

40 / 50

40. Which statement about metals in the solid state and atomicity is most accurate?

41 / 50

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

42 / 50

42. The law of conservation of mass was first proposed by:

43 / 50

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

44 / 50

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

45 / 50

45. Which compound has the molar mass of 98 g/mol?

46 / 50

46. The molecular mass of (ethane) is:

47 / 50

47. Which of the following is a triatomic molecule?

48 / 50

48. How many grams of NaOH are required to neutralize 49 g of H₂SO₄? Reaction:

49 / 50

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

50 / 50

50. How many moles of oxygen are required to completely combust 2 moles of ethane ()? Reaction:

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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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