CBSE Class 12 Chemistry Chemical Kinetics Question Bank Set B

Access the latest CBSE Class 12 Chemistry Chemical Kinetics Question Bank Set B. We have provided free printable Class 12 Chemistry worksheets in PDF format, specifically designed for Unit 3 Chemical Kinetics. These practice sets are prepared by expert teachers following the 2025-26 syllabus and exam patterns issued by CBSE, NCERT, and KVS.

Unit 3 Chemical Kinetics Chemistry Practice Worksheet for Class 12

Students should use these Class 12 Chemistry chapter-wise worksheets for daily practice to improve their conceptual understanding. This detailed test papers include important questions and solutions for Unit 3 Chemical Kinetics, to help you prepare for school tests and final examination. Regular practice of these Class 12 Chemistry questions will help improve your problem-solving speed and exam accuracy for the 2026 session.

Download Class 12 Chemistry Unit 3 Chemical Kinetics Worksheet PDF

 

QUESTION BANK
Chemical Kinetics
 
VSA QUESTIONS (1 - MARK QUESTIONS)
 
1. Why does the rate of a reaction not remain constant throughout the reaction process?
 
2. What is meant by order of a reaction being zero?
 
3. What is the shape of graph between log k vs1/T. What is the relationship between its slope and activation energy (Ea) ?
 
4. For a chemical reaction rate constant k = 5.3 × 10–4mol L–1 s–1.what will be the order of the reaction?
 
5. Express the rate of reaction in terms of disappearance of hydrogen and appearance of ammonia in the given reaction. N2(g) + 3 H2 (g)→ 2NH3 (g)
 
6. For the elementary step of a chemical reaction : A + H2O → Brate = [A]1.
What is the molecularity and order of the reaction.
 
7. Mention one example of pseudo first order reaction.
 
8. For the reaction Cl2(g)+NO (g) → 2NOCl(g),the rate law is expressed as rate =k[Cl2] [NO]2. What is the overall order of this reaction?
 
SA (I) QUESTIONS (2 - MARK QUESTIONS)
 
9. What do you mean by the rate law and rate constant of a reaction? Identify the order of a reaction if the units of its rate constant are
i. L-1mol s-1
ii. Lmol-1 s-1
 
10. A reaction is second order with respect to a reactant A. How is the rate of this reaction altered if the concentration of A is
i. Doubled
ii. Reduced to half?
11. Explain the terms
i. Rate determining step of areaction
ii. Molecularity of a reaction
 
12. iii. The rate constant for a reaction of zero order in A is 0.0030 mol L-1s-1. How long will it take for the initial concentration of A to fall from 0.10M to 0.075 M?
 
13. A first order reaction takes 40 minutes for 30% decomposition. Calculate its t1/2 value.
 
14. Show that for a first order reaction,the time required for half life is independent of initial concentration.
 
15. A reactant has a half life of 10 minutes.
i. Calculate the rate constant for the first order reaction.
ii. What fraction of the reactant will be left after an hour of the reaction has occurred?
 
16. Calculate the rate constant of a reaction at 293 K, given that: Ea=103 KJ/Mol, k=7.87x 10-7s-1, at 273 K,R=8.314 JK-1mol-1
 
17. The graphs (1 and 2) given below are plots of rate of reaction verses concentration of the reaction. Predict the order from the graphs

CBSE Class 12 Chemistry Chemical Kinetics Question Bank Set B 1

 
SA (II) QUESTIONS (3- MARK QUESTIONS)
 
17. For a decomposition reaction, the values of rate constant k , at two different temperatures are given below.
K1=2.15x10-8Lmol-1s-1 at 650 K , K2=2.39 x10-7Lmol-1s-1 at 700 K Calculate the value of activation energy for this reaction R=8.314JK-1mol-1
 
 
18. Consider the reaction 2A+B → C+ D
Following results were obtained in experiments designed to study the rate of reaction.

CBSE Class 12 Chemistry Chemical Kinetics Question Bank Set B 2

i. Write the rate law for the reaction.
ii. Calculate the value of rate constant for the reaction
iii. Which of the following possible reaction mechanisms is constant with the rate law found in (i)
 
I. A+B → C+ E (slow) A+E → D (fast)
II. B → C+ E (slow) A+E→ F (fast)
A+F→ D (fast)
 
19.. Explain the following :
i. A lump of coal burns at moderate rate in air while coal dust burns explosively.
ii. Average rate of reaction does not give the true picture of the reaction.
iii. Reactions of high molecularity are less in number.
 
20. i. Write four points of difference between order and molecularity of a reaction.
ii. List four methods for determination of order of reactions?
 
21. The decomposition of PH3 proceeds according to the following equation.
4PH3(g) → P4(g)+6 H2(g)
 
It is found that the reaction follows the following rate equation, Rate =k [PH3].The half life of PH3 is 37.9 s at 120 oC.
i. How much time is required for ¾ th of PH3 to decompose?
ii. What fraction of the original sample of PH3 remains behind after 1 minute?
 
LONG ANSWER QUESTION (5- MARK QUESTION)
 
22. i. Defineelementary reaction in a process.
ii. State the role of activated complex in a reaction and state its relation with activation energy.
iii. H2O2 (aq) decomposes to H2O(l) and O2 (g) in a reaction that is of first order in H2O2 and has a rate constant K=1.06 x10-3min -1.
a) How long will it take 15% of a sample of H2O2 to decompose?
b) How long will it take 85% of a sample of H2O2 to decompose?

 

Please click on below link to download CBSE Class 12 Chemistry Chemical Kinetics Question Bank Set B

Unit 02 Electrochemistry
CBSE Class 12 Chemistry Electrochemistry Question Bank
CBSE Class 12 Chemistry Electrochemistry Question Bank Set A
CBSE Class 12 Chemistry Electrochemistry Question Bank Set B
CBSE Class 12 Chemistry Electrochemistry Question Bank Set C
CBSE Class 12 Chemistry Electrochemistry Worksheet Set A
CBSE Class 12 Chemistry Electrochemistry Worksheet Set B
CBSE Class 12 Chemistry Electrochemistry Worksheet Set C
Unit 03 Chemical Kinetics
CBSE Class 12 Chemistry Chemical Kinetics Question Bank Set A
CBSE Class 12 Chemistry Chemical Kinetics Question Bank Set B
CBSE Class 12 Chemistry Chemical Kinetics Worksheet
CBSE Class 12 Chemistry Chemical Kinetics Worksheet Set A
CBSE Class 12 Chemistry Chemical Kinetics Worksheet Set B
CBSE Class 12 Chemistry Chemical Kinetics Worksheet Set C
CBSE Class 12 Chemistry Chemical Kinetics Worksheet Set D
Unit 04 The d- and f-Block Elements
CBSE Class 12 Chemistry All Chapters Solved Worksheet
CBSE Class 12 Chemistry D And F Block Elements Question Bank Set A
CBSE Class 12 Chemistry D And F Block Elements Question Bank Set B
CBSE Class 12 Chemistry D And F Block Elements Worksheet Set A
CBSE Class 12 Chemistry D And F Block Elements Worksheet Set B
CBSE Class 12 Chemistry D And F Block Elements Worksheet Set C
CBSE Class 12 Chemistry Organic Compounds Containing Nitrogen Worksheet
CBSE Class 12 Chemistry The D Block Elements Worksheet
CBSE Class 12 Chemistry The d and f Block Elements Worksheet Set A
CBSE Class 12 Chemistry The d and f Block Elements Worksheet Set B
Unit 05 Coordination Compounds
CBSE Class 12 Chemistry Coordination Compounds Question Bank Set A
CBSE Class 12 Chemistry Coordination Compounds Question Bank Set B
CBSE Class 12 Chemistry Coordination Compounds Worksheet Set A
CBSE Class 12 Chemistry Coordination Compounds Worksheet Set B
CBSE Class 12 Chemistry Coordination Compounds Worksheet Set C
CBSE Class 12 Chemistry Coordination Compounds Worksheet Set D
CBSE Class 12 Chemistry Coordination Compounds Worksheet Set E
Unit 06 Haloalkanes and Haloarenes
CBSE Class 12 Chemistry Haloalkanes And Haloarenes Question Bank Set A
CBSE Class 12 Chemistry Haloalkanes And Haloarenes Question Bank Set B
CBSE Class 12 Chemistry Haloalkanes and Haloarenes Worksheet Set A
CBSE Class 12 Chemistry Haloalkanes and Haloarenes Worksheet Set B
CBSE Class 12 Chemistry Haloalkanes And Haloarenes Worksheet Set C
CBSE Class 12 Chemistry Haloalkanes And Haloarenes Worksheet Set D
CBSE Class 12 Chemistry Haloalkanes And Haloarenes Worksheet Set E
Unit 07 Alcohols, Phenols and Ethers
CBSE Class 12 Chemistry Alcohols Phenols And Ethers Question Bank
CBSE Class 12 Chemistry Alcohols Phenols and Ethers Worksheet Set A
CBSE Class 12 Chemistry Alcohols Phenols And Ethers Worksheet Set B
CBSE Class 12 Chemistry Alcohols Phenols And Ethers Worksheet Set C
CBSE Class 12 Chemistry Alcohols Phenols And Ethers Worksheet Set D
CBSE Class 12 Chemistry Alcohols Phenols And Ethers Worksheet Set E
Unit 08 Aldehydes, Ketones and Carboxylic Acids
CBSE Class 12 Chemistry Aldehydes Ketone and Carboxylic Acids Worksheet Set A
CBSE Class 12 Chemistry Aldehydes Ketone and Carboxylic Acids Worksheet Set B
CBSE Class 12 Chemistry Aldehydes Ketones And Carboxylic Acids Question Bank Set A
CBSE Class 12 Chemistry Aldehydes Ketones And Carboxylic Acids Question Bank Set B
CBSE Class 12 Chemistry Aldehydes Ketones And Carboxylic Acids Question Bank Set C
CBSE Class 12 Chemistry Aldehydes Ketones And Carboxylic Acids Question Bank Set D
CBSE Class 12 Chemistry Aldehydes Ketones And Carboxylic Acids Question Bank Set E
Unit 09 Amines
CBSE Class 12 Chemistry Amines Worksheet Set A
CBSE Class 12 Chemistry Amines Worksheet Set B
CBSE Class 12 Chemistry Amines Worksheet Set C
CBSE Class 12 Chemistry Amines Worksheet Set D
CBSE Class 12 Chemistry Amines Worksheet Set E
Unit 10 Biomolecules
CBSE Class 12 Chemistry Biomolecules Question Bank Set A
CBSE Class 12 Chemistry Biomolecules Question Bank Set B
CBSE Class 12 Chemistry Biomolecules Worksheet Set A
CBSE Class 12 Chemistry Biomolecules Worksheet Set B
CBSE Class 12 Chemistry Biomolecules Worksheet Set C
CBSE Class 12 Chemistry Biomolecules Worksheet Set D
z More Worksheets for Class 12 Chemistry
CBSE Class 12 Chemistry All Chapters Questions Bank
CBSE Class 12 Chemistry Solution Question Bank
CBSE Class 12 Chemistry Solutions Question Bank Set A
CBSE Class 12 Chemistry Solutions Question Bank Set B
CBSE Class 12 Chemistry Solutions Worksheet
CBSE Class 12 Chemistry Solutions Worksheet Set A
CBSE Class 12 Chemistry Solutions Worksheet Set B
CBSE Class 12 Chemistry Worksheet Set A Solved
CBSE Class 12 Chemistry Worksheet Set B Solved
CBSE Class 12 Chemistry Worksheet Set C Solved
CBSE Class 12 Chemistry Worksheet Set D
CBSE Class 12 Chemistry Worksheet Set E Solved
CBSE Class 12 Chemistry Worksheet Set F
CBSE Class 12 Chemistry Worksheet Set G Solved
CBSE Class 12 Chemistry Worksheet Set H Solved
CBSE Class 12 Chemistry Worksheet Set I Solved
~ Class 12 Chemistry (Old Chapters)
CBSE Class 12 Chemistry Chemistry in Everyday Life Question Bank
CBSE Class 12 Chemistry Chemistry in Everyday Life Worksheet Set A
CBSE Class 12 Chemistry Chemistry in Everyday Life Worksheet Set B
CBSE Class 12 Chemistry General principles and Processes of isolation of elements Question Bank
CBSE Class 12 Chemistry General Principles and Processes of Isolation of Elements Worksheet Set A
CBSE Class 12 Chemistry General Principles And Processes of Isolation of Elements Worksheet Set B
CBSE Class 12 Chemistry General Principles And Processes of Isolation of Elements Worksheet Set C
CBSE Class 12 Chemistry General Principles And Processes of Isolation of Elements Worksheet Set D
CBSE Class 12 Chemistry General Principles And Processes of Isolation of Elements Worksheet Set E
CBSE Class 12 Chemistry In Everyday Life Question Bank
CBSE Class 12 Chemistry In Everyday Life Worksheet Set A
CBSE Class 12 Chemistry Polymers Worksheet Set A
CBSE Class 12 Chemistry Polymers Worksheet Set B
CBSE Class 12 Chemistry Polymers Worksheet Set C
CBSE Class 12 Chemistry Polymers Worksheet Set D
CBSE Class 12 Chemistry Solid State Question Bank
CBSE Class 12 Chemistry Solid State Question Bank Set A
CBSE Class 12 Chemistry Solid State Question Bank Set B
CBSE Class 12 Chemistry Solid State Worksheet
CBSE Class 12 Chemistry Surface Chemistry Question Bank
CBSE Class 12 Chemistry Surface Chemistry Question Bank Set A
CBSE Class 12 Chemistry Surface Chemistry Question Bank Set B
CBSE Class 12 Chemistry Surface Chemistry Worksheet Set A
CBSE Class 12 Chemistry Surface Chemistry Worksheet Set B
CBSE Class 12 Chemistry Surface Chemistry Worksheet Set C
CBSE Class 12 Chemistry Surface Chemistry Worksheet Set D
CBSE Class 12 Chemistry Surface Chemistry Worksheet Set E
CBSE Class 12 Chemistry The P Block Elements Question Bank
CBSE Class 12 Chemistry The P Block Elements Question Bank Set A
CBSE Class 12 Chemistry The P Block Elements Question Bank Set B
CBSE Class 12 Chemistry The p Block Elements Worksheet Set A
CBSE Class 12 Chemistry The p Block Elements Worksheet Set B
CBSE Class 12 Chemistry The p Block Elements Worksheet Set C
CBSE Class 12 Chemistry The P Block Elements Worksheet Set E
CBSE Class 12 Chemistry The P Block Elements Worksheet Set F
CBSE Class 12 Chemistry The Solid State Worksheet Set A
CBSE Class 12 Chemistry The Solid State Worksheet Set B

Important Practice Resources for Class 12 Chemistry

Unit 3 Chemical Kinetics CBSE Class 12 Chemistry Worksheet

Students can use the Unit 3 Chemical Kinetics practice sheet provided above to prepare for their upcoming school tests. This solved questions and answers follow the latest CBSE syllabus for Class 12 Chemistry. You can easily download the PDF format and solve these questions every day to improve your marks. Our expert teachers have made these from the most important topics that are always asked in your exams to help you get more marks in exams.

NCERT Based Questions and Solutions for Unit 3 Chemical Kinetics

Our expert team has used the official NCERT book for Class 12 Chemistry to create this practice material for students. After solving the questions our teachers have also suggested to study the NCERT solutions  which will help you to understand the best way to solve problems in Chemistry. You can get all this study material for free on studiestoday.com.

Extra Practice for Chemistry

To get the best results in Class 12, students should try the Chemistry MCQ Test for this chapter. We have also provided printable assignments for Class 12 Chemistry on our website. Regular practice will help you feel more confident and get higher marks in CBSE examinations.

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