Chemical Kinetics Quiz - CBSE Class 11 Science

Free practice quiz: Chemical Kinetics (CBSE Class 11 Science). 18 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 11 Science practice quiz has 18 multiple-choice questions on Chemical Kinetics, and 18 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. What is the rate of a reaction?

   1. The change in concentration of reactants per unit time
   2. The change in concentration of products per unit time
   3. Both A and B
   4. Neither A nor B
   Show answer

   Answer: C. Both A and B

   The rate of a reaction is defined as the change in concentration of reactants or products per unit time.

2. What is activation energy (Ea)?

   1. The minimum energy required for a reaction to occur
   2. The energy released during a reaction
   3. The energy absorbed during a reaction
   4. The energy of the products
   Show answer

   Answer: A. The minimum energy required for a reaction to occur

   Activation energy is the minimum energy that colliding molecules must possess to react.

3. What is the difference between a homogeneous and heterogeneous catalyst?

   1. Homogeneous catalysts are in the same phase as reactants, heterogeneous catalysts are in a different phase
   2. Homogeneous catalysts are in a different phase than reactants, heterogeneous catalysts are in the same phase
   3. There is no difference
   4. Both are in the same phase
   Show answer

   Answer: A. Homogeneous catalysts are in the same phase as reactants, heterogeneous catalysts are in a different phase

   The key difference lies in whether the catalyst and reactants are in the same or different phases.

4. Derive the integrated rate law for a first-order reaction.

   1. ln([A]t) - ln([A]0) = -kt
   2. 1/[A]t - 1/[A]0 = kt
   3. [A]t = [A]0 - kt
   4. None of the above
   Show answer

   Answer: A. ln([A]t) - ln([A]0) = -kt

   This equation is derived using calculus and shows the relationship between concentration and time for a first-order reaction.

5. Derive the rate law for a parallel reaction.

   1. The rate law is the sum of the individual rate laws for each pathway
   2. The rate law is the product of the individual rate laws for each pathway
   3. The rate law is the average of the individual rate laws for each pathway
   4. The rate law cannot be derived
   Show answer

   Answer: A. The rate law is the sum of the individual rate laws for each pathway

   In parallel reactions, multiple pathways exist; the overall rate is the sum of rates for each pathway.

More questions in this quiz

Answers and explanations are in the full quiz.

1. What is the order of a reaction?
2. What does the Arrhenius equation describe?
3. Explain the concept of collision theory.
4. What is a catalyst?
5. How does a catalyst affect the activation energy?
6. Describe the effect of temperature on the rate constant.
7. Explain the concept of half-life in a first-order reaction.
8. How can you determine the order of a reaction experimentally?
9. What is pseudo-first-order reaction?
10. Explain the concept of steady-state approximation.
11. Explain the effect of surface area on the rate of heterogeneous catalytic reactions.
12. Discuss the limitations of collision theory.
13. How can you determine the rate determining step in a complex reaction mechanism?

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