Relevant Titles:

1. CBSE Class 11 Chemistry MCQs – Ideal and Real Gases Online Test

2. NCERT Class 11 Chemistry Chapter 5 MCQs – Ideal vs Real Gas Behavior

3. CBSE Class 11 Chemistry Practice Quiz – Ideal and Real Gases Concepts

4. States of Matter Class 11 MCQs – Ideal and Real Gases with Answers

5. Free Online Test – CBSE Class 11 Ideal and Real Gases MCQs

📚 Introduction 

CBSE Class 11 Chemistry MCQs – Ideal and Real Gases focus on developing a deep understanding of gas behavior under varying temperature and pressure conditions. In Chapter 5: States of Matter – Gases and Liquids, students learn the distinctions between ideal gases, which perfectly obey the gas laws, and real gases, which deviate due to molecular interactions and finite size effects.

This set of NCERT-based MCQs helps learners revise key topics such as Boyle’s Law, Charles’s Law, Avogadro’s Law, van der Waals equation, compressibility factor (Z), virial coefficients, and the concept of critical temperature. Each question has been designed according to the CBSE Class 11 Chemistry board exam pattern, making it ideal for concept-based learning and competitive exam preparation like JEE and NEET.

By practicing these multiple-choice questions, students can strengthen their problem-solving skills, understand gas deviations from ideal behavior, and master the real-world applications of gas laws and intermolecular forces.

🧩 Sample MCQs (with Answers and Explanations):

Q1. Which of the following gases shows the least deviation from ideal behavior?
a) CO₂ b) NH₃ c) He d) H₂O
✅ Answer: c) He
Explanation: Helium is a small, non-polar gas with weak intermolecular forces, so it behaves nearly ideally under standard conditions.

Q2. In the van der Waals equation, the constant ‘a’ represents:
a) Volume correction b) Attraction between molecules c) Temperature factor d) Pressure correction
✅ Answer: b) Attraction between molecules
Explanation: The term ‘a’ corrects for intermolecular attractions that reduce observed gas pressure compared to the ideal gas.

Q3. When the compressibility factor (Z) is less than 1, the gas shows:
a) Ideal behavior b) Strong repulsive forces c) Predominant attractive forces d) No deviation
✅ Answer: c) Predominant attractive forces
Explanation: A Z value below 1 indicates that attractive forces lower the effective pressure of the gas.

Q4. Real gases behave ideally under which condition?
a) High pressure and low temperature b) Low pressure and high temperature c) Low pressure and low temperature d) High pressure and high temperature
✅ Answer: b) Low pressure and high temperature
Explanation: Under these conditions, gas molecules are far apart, minimizing intermolecular forces and volume effects.

Q5. The Boyle temperature of a gas is the temperature at which:
a) Gas cannot be liquefied b) Second virial coefficient becomes zero c) Compressibility equals zero d) Gas behaves non-ideally
✅ Answer: b) Second virial coefficient becomes zero
Explanation: At the Boyle temperature, the real gas shows ideal behavior over a range of pressures due to balanced attractive and repulsive forces.

✅ Highlight:
These NCERT-based MCQs on Ideal and Real Gases are designed specifically for CBSE Class 11 Chemistry students, providing conceptual clarity, exam-oriented practice, and a solid foundation for JEE and NEET aspirants.