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Some Basic Concepts of Chemistry WBJEE MCQ & Practice Questions

Practice Some Basic Concepts of Chemistry MCQs for WBJEE Chemistry with answers, explanations, chapter revision and related ChemNexa mock tests.

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Some Basic Concepts of Chemistry Revision Guide for WBJEE Chemistry

Some Basic Concepts of Chemistry is part of WBJEE Chemistry preparation. A strong revision plan should combine concept review with exam-style questions so that definitions, relationships, calculations and exceptions are recalled accurately.

Use the sample MCQs on this page to check understanding, then attempt the related ChemNexa tests for broader practice. When an answer is wrong, review the explanation and return to the underlying concept before attempting another set.

Important Topics

  • Core definitions and principles
  • Important equations or relationships
  • Common applications and examples
  • Frequently confused concepts
  • Exam-style multiple-choice questions
  • Error review and targeted revision

Revision Tip

Create a one-page summary of trends, structures, reactions, exceptions and key terminology for Some Basic Concepts of Chemistry, then test recall with mixed MCQs.

What to practise in Some Basic Concepts of Chemistry

Concept Revision

Revise definitions, principles, equations, trends and core ideas from Some Basic Concepts of Chemistry before attempting MCQs.

Exam-style MCQs

Use chapter-focused multiple-choice practice to improve accuracy, recall and application for WBJEE Chemistry.

Performance Practice

Attempt ChemNexa tests, review results and return to weak areas for another round of targeted revision.

Top 20 Some Basic Concepts of Chemistry MCQs with Answers

These public questions are selected from the exact Some Basic Concepts of Chemistry chapter, screened for topic relevance and deduplicated so repeated versions of the same MCQ are not shown publicly. Use them for quick revision, then sign in to attempt the complete test experience with more questions, results and performance review.

WBJEE Chemistry · Some Basic Concepts of Chemistry · Very Very Hard

1. 4.5 g of H2O corresponds to how many moles?

  • A. 0.125 mol
  • B. 4.25 mol
  • C. 0.25 mol
  • D. 0.5 mol
Answer: C
Explanation: n = mass/molar mass = 4.5/18 = 0.25 mol.

WBJEE Chemistry · Some Basic Concepts of Chemistry · Very Very Hard

2. 9 g of H2O corresponds to how many moles?

  • A. 0.75 mol
  • B. 0.5 mol
  • C. 1 mol
  • D. 0.25 mol
Answer: B
Explanation: n = mass/molar mass = 9/18 = 0.5 mol.

WBJEE Chemistry · Some Basic Concepts of Chemistry · Very Very Hard

3. 13.5 g of H2O corresponds to how many moles?

  • A. 0.75 mol
  • B. 1.5 mol
  • C. 0.375 mol
  • D. 1 mol
Answer: A
Explanation: n = mass/molar mass = 13.5/18 = 0.75 mol.

WBJEE Chemistry · Some Basic Concepts of Chemistry · Very Very Hard

4. 22.5 g of H2O corresponds to how many moles?

  • A. 2.5 mol
  • B. 0.625 mol
  • C. 1.5 mol
  • D. 1.25 mol
Answer: D
Explanation: n = mass/molar mass = 22.5/18 = 1.25 mol.

WBJEE Chemistry · Some Basic Concepts of Chemistry · Very Very Hard

5. 27 g of H2O corresponds to how many moles?

  • A. 0.75 mol
  • B. 1.75 mol
  • C. 1.5 mol
  • D. 3 mol
Answer: C
Explanation: n = mass/molar mass = 27/18 = 1.5 mol.

WBJEE Chemistry · Some Basic Concepts of Chemistry · Very Very Hard

6. 11 g of CO2 corresponds to how many moles?

  • A. 4.25 mol
  • B. 0.25 mol
  • C. 0.5 mol
  • D. 0.125 mol
Answer: B
Explanation: n = mass/molar mass = 11/44 = 0.25 mol.

WBJEE Chemistry · Some Basic Concepts of Chemistry · Very Very Hard

7. 22 g of CO2 corresponds to how many moles?

  • A. 0.5 mol
  • B. 1 mol
  • C. 0.25 mol
  • D. 0.75 mol
Answer: A
Explanation: n = mass/molar mass = 22/44 = 0.5 mol.

WBJEE Chemistry · Some Basic Concepts of Chemistry · Very Very Hard

8. 33 g of CO2 corresponds to how many moles?

  • A. 1.5 mol
  • B. 0.375 mol
  • C. 1 mol
  • D. 0.75 mol
Answer: D
Explanation: n = mass/molar mass = 33/44 = 0.75 mol.

WBJEE Chemistry · Some Basic Concepts of Chemistry · Very Very Hard

9. 55 g of CO2 corresponds to how many moles?

  • A. 0.625 mol
  • B. 1.5 mol
  • C. 1.25 mol
  • D. 2.5 mol
Answer: C
Explanation: n = mass/molar mass = 55/44 = 1.25 mol.

WBJEE Chemistry · Some Basic Concepts of Chemistry · Very Very Hard

10. 66 g of CO2 corresponds to how many moles?

  • A. 1.75 mol
  • B. 1.5 mol
  • C. 3 mol
  • D. 0.75 mol
Answer: B
Explanation: n = mass/molar mass = 66/44 = 1.5 mol.

WBJEE Chemistry · Some Basic Concepts of Chemistry · Very Very Hard

11. 4.25 g of NH3 corresponds to how many moles?

  • A. 0.25 mol
  • B. 0.5 mol
  • C. 0.125 mol
  • D. 4.25 mol
Answer: A
Explanation: n = mass/molar mass = 4.25/17 = 0.25 mol.

WBJEE Chemistry · Some Basic Concepts of Chemistry · Very Very Hard

12. 8.5 g of NH3 corresponds to how many moles?

  • A. 1 mol
  • B. 0.25 mol
  • C. 0.75 mol
  • D. 0.5 mol
Answer: D
Explanation: n = mass/molar mass = 8.5/17 = 0.5 mol.

WBJEE Chemistry · Some Basic Concepts of Chemistry · Very Very Hard

13. 12.75 g of NH3 corresponds to how many moles?

  • A. 0.375 mol
  • B. 1 mol
  • C. 0.75 mol
  • D. 1.5 mol
Answer: C
Explanation: n = mass/molar mass = 12.75/17 = 0.75 mol.

WBJEE Chemistry · Some Basic Concepts of Chemistry · Very Very Hard

14. 21.25 g of NH3 corresponds to how many moles?

  • A. 1.5 mol
  • B. 1.25 mol
  • C. 2.5 mol
  • D. 0.625 mol
Answer: B
Explanation: n = mass/molar mass = 21.25/17 = 1.25 mol.

WBJEE Chemistry · Some Basic Concepts of Chemistry · Very Very Hard

15. 25.5 g of NH3 corresponds to how many moles?

  • A. 1.5 mol
  • B. 3 mol
  • C. 0.75 mol
  • D. 1.75 mol
Answer: A
Explanation: n = mass/molar mass = 25.5/17 = 1.5 mol.

WBJEE Chemistry · Some Basic Concepts of Chemistry · Very Very Hard

16. 4 g of CH4 corresponds to how many moles?

  • A. 0.5 mol
  • B. 0.125 mol
  • C. 4.25 mol
  • D. 0.25 mol
Answer: D
Explanation: n = mass/molar mass = 4/16 = 0.25 mol.

WBJEE Chemistry · Some Basic Concepts of Chemistry · Very Very Hard

17. 8 g of CH4 corresponds to how many moles?

  • A. 0.25 mol
  • B. 0.75 mol
  • C. 0.5 mol
  • D. 1 mol
Answer: C
Explanation: n = mass/molar mass = 8/16 = 0.5 mol.

WBJEE Chemistry · Some Basic Concepts of Chemistry · Very Very Hard

18. 12 g of CH4 corresponds to how many moles?

  • A. 1 mol
  • B. 0.75 mol
  • C. 1.5 mol
  • D. 0.375 mol
Answer: B
Explanation: n = mass/molar mass = 12/16 = 0.75 mol.

WBJEE Chemistry · Some Basic Concepts of Chemistry · Very Very Hard

19. 20 g of CH4 corresponds to how many moles?

  • A. 1.25 mol
  • B. 2.5 mol
  • C. 0.625 mol
  • D. 1.5 mol
Answer: A
Explanation: n = mass/molar mass = 20/16 = 1.25 mol.

WBJEE Chemistry · Some Basic Concepts of Chemistry · Very Very Hard

20. 24 g of CH4 corresponds to how many moles?

  • A. 3 mol
  • B. 0.75 mol
  • C. 1.75 mol
  • D. 1.5 mol
Answer: D
Explanation: n = mass/molar mass = 24/16 = 1.5 mol.

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Some Basic Concepts of Chemistry Practice Tests

Some Basic Concepts of Chemistry Frequently Asked Questions

How should I prepare Some Basic Concepts of Chemistry for WBJEE Chemistry?

Revise the core concepts first, make a short list of important relationships or exceptions, and then solve chapter-focused MCQs while reviewing every error.

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What should I do after getting an MCQ wrong?

Identify whether the mistake came from a concept gap, calculation, unit, sign, wording or memory error, review that point, and then attempt a similar question again.

Continue with another chapter to build connected concepts and strengthen your overall Chemistry preparation.

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