Relevant Titles:
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CBSE Class 11 Chemistry MCQs – Molar Volume and Density Practice Test
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Class 11 Chemistry Chapter 1 MCQs – NCERT-Based Quiz on Molar Volume
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Molar Volume and Density Class 11 Chemistry MCQs – Online Test
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CBSE Class 11 Physical Chemistry MCQs – Molar Volume & Density Calculations
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NCERT Class 11 Chemistry MCQs – Molar Volume and Density for Board Exams
📚 Introduction Paragraph
Molar Volume and Density are fundamental concepts in Chapter 1 – Some Basic Concepts of Chemistry of CBSE Class 11 Physical Chemistry. These topics help students understand the quantitative relationship between the amount of substance, mass, and volume of gases under specific conditions. Knowing how to calculate molar volume (22.4 L at STP) and density of gases, solids, and liquids is essential for solving stoichiometric problems accurately.
This online MCQ practice test is carefully designed as per the NCERT Class 11 Chemistry syllabus, making it an excellent resource for CBSE board exam preparation and competitive exams like JEE Main and NEET. Each question focuses on real-world applications, formula-based problems, and conceptual understanding of molar relationships.
By practicing these Molar Volume and Density MCQs, students can reinforce their conceptual clarity, improve calculation speed, and gain confidence in solving numerical questions under exam conditions.
🧩 Sample MCQs (with Answers & Explanations):
Q1. The molar volume of an ideal gas at STP is:
A. 11.2 L mol⁻¹ B. 22.4 L mol⁻¹ C. 44.8 L mol⁻¹ D. 1.12 L mol⁻¹
✅ Answer: B
💡 Explanation: At standard temperature and pressure (0°C and 1 atm), one mole of an ideal gas occupies 22.4 L.
Q2. The density (ρ) of a gas at STP can be calculated using the formula:
A. ρ = molar volume / molar mass B. ρ = molar mass / molar volume C. ρ = volume / molar mass D. None
✅ Answer: B
💡 Explanation: Density = Molar Mass ÷ Molar Volume (ρ = M / 22.4 for gases at STP).
Q3. The density of oxygen gas (O₂, M = 32 g/mol) at STP is:
A. 0.71 g/L B. 1.43 g/L C. 32.0 g/L D. 2.24 g/L
✅ Answer: B
💡 Explanation: ρ = 32 ÷ 22.4 = 1.43 g/L.
Q4. The molar mass of a gas with density 1.25 g/L at STP is:
A. 22.4 g/mol B. 24.0 g/mol C. 28.0 g/mol D. 44.8 g/mol
✅ Answer: C
💡 Explanation: M = ρ × 22.4 = 1.25 × 22.4 = 28.0 g/mol.
Q5. At 25°C (298 K) and 1 atm, the molar volume of an ideal gas is approximately:
A. 22.4 L B. 24.0 L C. 18.0 L D. 11.2 L
✅ Answer: B
💡 Explanation: Under 25°C and 1 atm, one mole of an ideal gas occupies nearly 24.0 L due to thermal expansion.