Relevant Titles:

1. CBSE Class 11 Chemistry MCQs – States of Matter (Gases and Liquids) Quiz

2. NCERT Class 11 Chemistry Chapter 5 MCQs – States of Matter Practice Test

3. Online Chemistry Quiz – States of Matter for Class 11 CBSE

4. CBSE Class 11 States of Matter Objective Questions with Answers

5. Free NCERT-Based Class 11 Chemistry MCQs – Gaseous and Liquid States

📚 Introduction

CBSE Class 11 Chemistry MCQs – States of Matter (Gases and Liquids) help students understand the fundamental concepts of gas laws, molecular interactions, and liquid properties covered in Chapter 5 of the NCERT Chemistry textbook. This topic explains how the behavior of gases and liquids can be described through Boyle’s Law, Charles’s Law, Avogadro’s Law, Dalton’s Law of Partial Pressures, and van der Waals equation for real gases.

These NCERT-based multiple-choice questions are designed as per the CBSE Class 11 board exam pattern, ensuring comprehensive coverage of theoretical and numerical aspects. The quiz provides automatic scoring and instant feedback, making it ideal for concept reinforcement, self-assessment, and competitive exam preparation for tests like JEE and NEET.

By practicing these MCQs, students will strengthen their understanding of kinetic theory, pressure, temperature, viscosity, surface tension, and diffusion — key areas for mastering physical chemistry. Attempt this 30-minute quiz to improve both speed and accuracy before your exams.

🧩 Sample MCQs (with Answers and Explanations):

Q1. Which law states that the volume of a gas is inversely proportional to pressure at constant temperature?
a) Charles’s Law b) Boyle’s Law c) Avogadro’s Law d) Dalton’s Law
✅ Answer: b) Boyle’s Law
Explanation: Boyle’s Law states that at constant temperature, $PV=\text{constant}$. When pressure increases, volume decreases proportionally.

Q2. According to Avogadro’s Law, equal volumes of gases under the same conditions of temperature and pressure contain:
a) Equal masses b) Equal number of molecules c) Equal densities d) Equal pressure
✅ Answer: b) Equal number of molecules
Explanation: Avogadro’s Law defines that gas volumes are proportional to the number of moles when temperature and pressure are constant.

Q3. Which property of liquids decreases with an increase in temperature?
a) Surface tension b) Vapour pressure c) Kinetic energy d) None of these
✅ Answer: a) Surface tension
Explanation: As temperature increases, intermolecular forces weaken, reducing the surface tension of a liquid.

Q4. The van der Waals equation accounts for:
a) Molecular size and intermolecular forces b) Temperature variation c) Diffusion d) Compressibility
✅ Answer: a) Molecular size and intermolecular forces
Explanation: The terms “a” and “b” in the van der Waals equation correct for attractive forces and finite molecular volume.

Q5. The unit of the gas constant (R) in the SI system is:
a) L atm mol⁻¹ K⁻¹ b) J mol⁻¹ K⁻¹ c) cm³ mol⁻¹ K⁻¹ d) erg mol⁻¹ K⁻¹
✅ Answer: b) J mol⁻¹ K⁻¹
Explanation: In SI units, the universal gas constant R = 8.314 J mol⁻¹ K⁻¹, linking pressure, volume, and temperature in the ideal gas equation.

✅ Highlight: These MCQs are strictly NCERT-aligned, perfect for CBSE Class 11 Chemistry board exam practice and concept-based learning for competitive exams like JEE and NEET.