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Mole Concept Class 11 Chemistry MCQs with Answers – NCERT Practice Test
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Introduction Paragraph
Mastering the Mole Concept and Chemical Calculations is essential for success in CBSE Class 11 Chemistry, especially under Physical Chemistry – Chapter 1: Some Basic Concepts of Chemistry. This topic builds the foundation for understanding chemical reactions, stoichiometry, and quantitative problem-solving in later chapters. To help students strengthen their conceptual clarity, we’ve created an interactive online MCQ practice test that strictly follows the NCERT syllabus and the CBSE Class 11 exam pattern.
Each multiple-choice question is designed to test core principles such as Avogadro’s number, molar mass, empirical and molecular formulas, and chemical stoichiometry. The quiz includes instant feedback, automatic scoring, and detailed explanations to enhance self-assessment and learning.
Whether you’re revising for exams or improving accuracy in calculations, this CBSE Class 11 Chemistry MCQ test on Mole Concept and Chemical Calculations will help you assess your understanding effectively. Practice regularly to gain confidence and achieve top marks in your board examinations.
Sample MCQs with Explanations
Q1. How many atoms are present in 12 g of carbon-12?
A) 12 × 6.022 × 10²³
B) 6.022 × 10²³
C) 1.204 × 10²⁴
D) 3.011 × 10²³
✅ Answer: B
Explanation: 12 g of carbon-12 represents 1 mole, which contains Avogadro’s number (6.022 × 10²³) atoms.
Q2. The molar mass of water (H₂O) is:
A) 16 g/mol B) 18 g/mol C) 20 g/mol D) 34 g/mol
✅ Answer: B
Explanation: M(H₂O) = 2×1 (H) + 16 (O) = 18 g/mol.
Q3. 88 g of CO₂ corresponds to how many moles?
A) 1 mol B) 2 mol C) 3 mol D) 0.5 mol
✅ Answer: B
Explanation: Moles = Mass / Molar mass = 88 / 44 = 2 mol.
Q4. The number of molecules in 18 g of water is:
A) 3.011 × 10²³ B) 6.022 × 10²³ C) 1.204 × 10²⁴ D) 2 × 6.022 × 10²³
✅ Answer: B
Explanation: 18 g H₂O = 1 mole = 6.022 × 10²³ molecules.
Q5. The empirical formula of a compound containing 40% C, 6.7% H, and 53.3% O is:
A) CH₂O B) C₂H₂O₂ C) C₂H₄O D) CHO
✅ Answer: A
Explanation: Simplest ratio of C:H:O ≈ 1:2:1 → CH₂O.