Chemical Kinetics Quiz - CBSE Class 12 Chemistry

Free practice quiz: Chemical Kinetics (CBSE Class 12 Chemistry). 17 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

This CBSE Class 12 Chemistry practice quiz has 17 multiple-choice questions on Chemical Kinetics, and 17 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 unit of rate constant (k) in a first-order reaction?

   1. mol/L.s
   2. s^-1
   3. L^2/mol.s
   4. mol^2/L^2.s
   Show answer

   Answer: B. s^-1

   For a first-order reaction, the rate constant has a unit of 's^-1' which reflects the change in concentration over time.

2. The rate of a reaction generally increases with increase in temperature due to:

   1. Increased molecular collisions
   2. Decreased activation energy
   3. Change in pH
   4. Reduction in volume
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   Answer: A. Increased molecular collisions

   As temperature increases, molecules move faster, leading to more frequent collisions, thus increasing the reaction rate.

3. If a reaction is zero-order, what is the effect of concentration on the rate of the reaction?

   1. Rate increases linearly with concentration
   2. Rate decreases with concentration
   3. Rate is constant
   4. Rate depends on temperature only
   Show answer

   Answer: C. Rate is constant

   In a zero-order reaction, the rate of reaction is constant and does not depend on the concentration of reactants.

4. In a chemical reaction, which of the following factors can lead to a change in the activation energy?

   1. Change in temperature
   2. Change in pressure
   3. Use of a catalyst
   4. Change in the color of the reactants
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   Answer: C. Use of a catalyst

   A catalyst provides an alternative pathway for the reaction with a lower activation energy, affecting the rate.

5. How does a graph of concentration versus time appear for a zero-order reaction?

   1. Linear decrease
   2. Exponential decrease
   3. Constant
   4. Parabolic curve
   Show answer

   Answer: A. Linear decrease

   In a zero-order reaction, the concentration decreases linearly over time, indicating a constant rate of reaction.

More questions in this quiz

Answers and explanations are in the full quiz.

1. In the reaction A → products, if the concentration of A decreases from 0.10 M to 0.05 M in 10 seconds, what is the average rate of reaction?
2. Which of the following factors does NOT affect the rate of a chemical reaction?
3. What is the relationship between the rate of a reaction and concentration in a second-order reaction?
4. What is the effect of a catalyst on a chemical reaction?
5. What is the role of the transition state in chemical reactions?
6. The Arrhenius equation relates rate constant k to which of the following?
7. What does the term 'half-life' mean in first-order reactions?
8. What is the significance of the rate law in chemical kinetics?
9. Why is the rate of a reaction not affected in a zero-order reaction even when the concentration of the reactant changes?
10. What happens to the rate of a reaction if the temperature decreases significantly?
11. Which statement is true about the relationship between rate constant and temperature?
12. In which scenario can the half-life of a reaction be affected positively?

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