In NCERT Class 12 Chemistry Chapter 3, "Chemical Kinetics," students explore the rates of chemical reactions, factors influencing them, and the mathematical expressions describing reaction rates. This chapter lays the groundwork for understanding reaction mechanisms and provides insight into industrial and biochemical processes.
This article includes valuable resources for CBSE and CUET exam preparation, featuring sample MCQs and subjective questions. Downloadable PDFs for Class 12 Chemistry Chapter 3 MCQs and previous year questions are also included to enhance your preparation for NCERT Class 12 Chemical Kinetics.
|
NCERT Class 12 Chemistry Chapters
|
|
|
Chapter Number
|
Chapter Name
|
|
Chapter I
|
|
|
Chapter II
|
|
|
Chapter IV
|
|
|
Chapter V
|
|
|
Chapter VI
|
|
|
Chapter VII
|
|
|
Chapter VIII
|
|
|
Chapter IX
|
|
|
Chapter X
|
|
This question bank includes previous years' CUET and CBSE MCQs, along with questions curated by subject experts. Below are 5 sample multiple-choice questions (MCQs) for Class 12 Chemistry Chapter 3: Chemical Kinetics. For the full set of 50 questions, download the PDF using the link provided below.
(a) |
|
2. For the reaction A + 2B → C + D, the rate law is given by r = k[A] [B]2, the concentration of A is kept constant while that of B is doubled. The rate of the reaction will: (a) double (b) become half (c) not change (d) quadruple |
|
3. Two statements are given one labelled as Assertion (A) and the other labelled as Reason (R). Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below. Assertion (A): The molecularity of the reaction H2 + Br2 → 2HBr appears to be 2. Reason (R): Two molecules of the reactants are involved in the given elementary reaction. (a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). (b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). (c) Assertion (A) is true, but Reason (R) is false. (d) Assertion (A) is false, but Reason (R) is true.
|
|
4. For the reaction 3A → 2B, rate of reaction (a) |
|
5. The unit of the rate of reaction is the same as that of the rate constant for a: (a) first order reaction (b) second order reaction (c) zero order reaction (d) it cannot be same |
This question bank includes previous years' CBSE subjective questions (2 marks and above) without solutions, along with expert-curated questions. Below are 5 sample subjective questions for Class 12 Chemistry Chapter 3: Chemical Kinetics. To access all questions, download the PDF from the link provided below.
1. Define the rate of a chemical reaction. Explain the difference between average rate and
|
2. |
A reaction is first order w.r.t. reactant A as well as w.r.t. reactant B. Give the rate law. Also give one point of difference between average rate and instantaneous rate. (CBSE 2020, 2M) |
|
3. |
Define order of reaction. Predict the order of reaction in the given graphs: where [R]o is the initial concentration of reactant and t1/2 is half-life. (CBSE 2019, 2M) |
|
4. |
Show that for a first order reaction, time required for completion of 99% of reaction is twice the time required for completion of 90% of reaction. (CBSE 2019, 2M) |
|
5. |
A first order reaction is 50% complete in 30 minutes at 300 K and in 10 minutes at 320 K. Calculate activation energy (Ea) for the reaction. [R = 8.314 J K–1 mol–1] [Given : log 2 = 0.3010, log 3 = 0.4771, log 4 = 0.6021] (CBSE 2023, 3M) |
|
6. |
A first order reaction is 50% complete in 40 minutes. Calculate the time required for the completion of 90% of reaction. [Given : log 2 = 0.3010, log 10 = 1] (CBSE 2022, 3M) |
|
NCERT Science Subjects
|
|
|
Chemistry
|
Physics
|
|
Mathematics
|
Physical Education
|
|
Chapter Name |
Sub Topics of Chapter 3: Chemical Kinetics |
|
Chemical Kinetics |
3.1 Introduction |
|
3.2 Rate of a Chemical Reaction |
|
|
3.3 Factors Influencing Rate of a Reaction |
|
|
3.4 Integrated Rate Equations |
|
|
3.5 Temperature Dependence of the Rate Constant |
|
|
3.6 Collision Theory of Chemical Reactions |
NCERT Class 12 Chemistry Chapter 3, "Chemical Kinetics," discusses reaction rates and the factors affecting them. It introduces students to concepts like reaction order, rate laws, and the Arrhenius equation, which are crucial for understanding chemical processes in depth.
This chapter bridges theoretical chemistry with real-world applications, preparing students for exams like CBSE and CUET and for advanced studies in physical chemistry.