Exam-Style Online Test | Class 11 Chemistry: Basic Concepts
GK Aim: A Treasure of MCQs

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

Start Your Test by Choosing a Paper

0%

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?

Please provide information to view your result.

Your score is

Share your achievement!

LinkedIn Facebook
0%

Please provide your feedback.

Thank you for your valuable feedback.

0%

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

2 / 30

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

3 / 30

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

4 / 30

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

5 / 30

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

6 / 30

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

7 / 30

7. Why is molecular formula considered more informative than empirical formula?

8 / 30

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

9 / 30

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

10 / 30

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

11 / 30

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

12 / 30

12. Which of the following best illustrates the Law of Multiple Proportions?

13 / 30

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

14 / 30

14. Which particle is responsible for the chemical behavior of an atom?

15 / 30

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

16 / 30

16. One key merit of Dalton’s theory was that it provided:

17 / 30

17. Which engineering material is designed using chemical knowledge of polymers?

18 / 30

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

19 / 30

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

20 / 30

20. In the reaction , 12 g Mg reacts with 16 g O₂. Which is limiting?

21 / 30

21. What is meant by actual yield of a reaction?

22 / 30

22. What is the atomicity of ammonium nitrate, ?

23 / 30

23. The molar mass of calcium carbonate () is:

24 / 30

24. Who proposed the Law of Definite Proportions?

25 / 30

25. How many grams of NaCl are formed when 5.85 g Na reacts with excess Cl₂? Reaction:

26 / 30

26. Which of the following correctly explains why mass is conserved in chemical reactions?

27 / 30

27. In , the percentage of chlorine is:

28 / 30

28. Which of the following laws is directly supported by the Law of Reciprocal Proportions?

29 / 30

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

30 / 30

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

Please provide information to view your result.

Your score is

Share your achievement!

LinkedIn Facebook
0%

Please provide your feedback.

Thank you for your valuable feedback.

0%

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!

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. Which postulate explains the Law of Conservation of Mass?

2 / 50

2. Which discovery challenged Dalton’s idea that atoms are indivisible?

3 / 50

3. 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:

4 / 50

4. Which formula is used to calculate molecular mass?

5 / 50

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

6 / 50

6. What is the atomicity of glucose ?

7 / 50

7. What is the definition of a mole in chemistry?

8 / 50

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

9 / 50

9. What is the atomicity of calcium hydroxide, ?

10 / 50

10. In the equation , the coefficient of hydrogen gas is:

11 / 50

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

12 / 50

12. Which merit of Dalton’s theory helped establish chemical formulae?

13 / 50

13. Which particle is responsible for the chemical behavior of an atom?

14 / 50

14. Which chemical is used in the agriculture industry as a pesticide?

15 / 50

15. Which condition is necessary to apply Gay-Lussac’s Law of Gaseous Volumes correctly?

16 / 50

16. Which of the following is a molecule and not a compound?

17 / 50

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

18 / 50

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

19 / 50

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

20 / 50

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

21 / 50

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

22 / 50

22. What does the term atomicity refer to?

23 / 50

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

24 / 50

24. Which of the following correctly links Avogadro’s number and molar mass?

25 / 50

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

26 / 50

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

27 / 50

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

28 / 50

28. Why are atoms considered neutral?

29 / 50

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

30 / 50

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

31 / 50

31. How many liters of H₂ gas at STP are liberated when 2 g of Zn reacts with HCl? Reaction:

32 / 50

32. The SI unit of molar mass is:

33 / 50

33. Which of the following statements is true about empirical formulas?

34 / 50

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

35 / 50

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

36 / 50

36. Which of the following represents a molecule and not a single atom?

37 / 50

37. Which of the following compounds has atomicity 7?

38 / 50

38. Which element exists as a polyatomic molecule under normal conditions?

39 / 50

39. The study of enzymes acting as catalysts in biochemical reactions is an overlap of:

40 / 50

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

41 / 50

41. Which of the following laws is directly supported by the Law of Reciprocal Proportions?

42 / 50

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

43 / 50

43. In the combustion reaction , what is the coefficient of CO₂?

44 / 50

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

45 / 50

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

46 / 50

46. The empirical formula of acetic acid is CH₂O. If its molar mass is 60 g/mol, what is its molecular formula?

47 / 50

47. In a sample of water, the ratio of hydrogen to oxygen atoms is always:

48 / 50

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

49 / 50

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

50 / 50

50. What are the stoichiometric coefficients of reactants in the neutralization reaction ?

Please provide accurate information so we can send your Achievement Certificate by mail.

Your score is

Share your achievement!

LinkedIn Facebook
0%

Please provide your feedback.

Thank you for your valuable feedback.

Practice Some Basic Concepts of Chemistry MCQs
Download Class 11 Chemistry MCQ Study Bundle

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)

  • Do not refresh or close the tab during the test, as it may disrupt your session.
  • 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.

FAQs on Some Basic Concepts of Chemistry Online Test ▼

Subscribe
Notify of
guest
0 Comments

Related MCQs

Scroll to Top