Relevant Titles
-
Class 11 Chemistry MCQs on Endothermic and Exothermic Reactions (With Answers)
-
Thermodynamics Important Questions – Endothermic & Exothermic Reactions Class 11
-
CBSE Class 11 Chemistry Quiz on Endothermic and Exothermic Processes
-
NCERT-Based Class 11 Thermodynamics MCQs for CBSE Board Exam Practice
-
Free Online Test: Class 11 Chemistry – Endothermic vs Exothermic Reactions
Introduction
Understanding Endothermic and Exothermic Reactions is a key part of Class 11 Chemistry Thermodynamics under the CBSE syllabus. These concepts help students differentiate between chemical processes that absorb heat (endothermic) and those that release heat (exothermic). A clear grasp of enthalpy change (ΔH), energy transfer, and system-surroundings interaction is essential for both conceptual clarity and exam success.
This online MCQ practice test is designed strictly as per the NCERT Class 11 Chemistry Chapter 6 – Thermodynamics. It includes multiple-choice questions that test your understanding of energy flow, bond formation and breaking, and real-life thermochemical examples.
Each question comes with detailed explanations, helping students strengthen their conceptual base for CBSE board exams, JEE, and NEET Chemistry preparation. Attempt this 30-minute timed quiz to evaluate your grasp of thermochemical principles and improve problem-solving accuracy.
Start practicing today and master the difference between endothermic and exothermic reactions with confidence!
Sample MCQs (With Answers and Explanations)
Q1. Which of the following reactions is exothermic?
A) Photosynthesis
B) Melting of ice
C) Combustion of methane
D) Electrolysis of water
✅ Answer: C) Combustion of methane
Explanation: Combustion reactions release heat energy to the surroundings, making them exothermic processes (ΔH < 0).
Q2. Which process among the following is endothermic in nature?
A) Condensation of steam
B) Freezing of water
C) Evaporation of alcohol
D) Neutralization of acid and base
✅ Answer: C) Evaporation of alcohol
Explanation: Evaporation absorbs heat from surroundings, decreasing the temperature of the surroundings, hence it is endothermic.
Q3. In an exothermic reaction, which statement is true about enthalpy change (ΔH)?
A) ΔH > 0
B) ΔH = 0
C) ΔH < 0
D) ΔH changes with time
✅ Answer: C) ΔH < 0
Explanation: Exothermic reactions release heat to the surroundings; therefore, the enthalpy change is negative.
Q4. Dissolution of ammonium nitrate in water results in a temperature decrease. This process is:
A) Exothermic
B) Endothermic
C) Isothermal
D) Adiabatic
✅ Answer: B) Endothermic
Explanation: The solution absorbs heat from the surroundings during dissolution, which lowers the temperature—an endothermic behavior.
Q5. Which statement correctly describes endothermic and exothermic reactions?
A) Exothermic absorbs heat; endothermic releases heat.
B) Endothermic reactions always occur spontaneously.
C) Exothermic reactions release heat; endothermic absorb heat.
D) Both have ΔH = 0.
✅ Answer: C) Exothermic reactions release heat; endothermic absorb heat.
Explanation: The defining factor is the direction of heat flow—exothermic releases energy (ΔH negative), while endothermic absorbs it (ΔH positive).
✅ Highlight:
These MCQs are designed strictly as per NCERT Class 11 Chemistry syllabus, ideal for CBSE board exams, JEE, and NEET preparation.