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.

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
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   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
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   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
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   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
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   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
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   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.

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