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NCERT Solutions Class 12 Chemistry - Chapter 3 Chemical Kinetics - PDF Download

JEE Mains & Advanced

NCERT solutions for class 12 chemistry chapter 3 chemical kinetics is study material that help students to understand the concepts related to chemical kinetics better. These solutions are prepared by the subject experts of eSaral's in easy-to-understand language.

Chemical kinetics is one of the most important chapter of physical chemistry. It is based on knowledge of reaction rates. It can be compared to thermodynamics which deals with direction of reaction. However, it does not tell about the reaction rate.

Chemical kinetics has a lot of applications in cosmology and geology as well as in some cases in psychology. In notes of class 12, chemical kinetics has a wide range of applications and how it can help humanity build a better tomorrow.

After studying this unit, you will able to

  • Determine the average reaction rate and instantaneous reaction rate

  • Describe the reaction rate in terms of the change in concentration of reactants or products over time

  • Differentiate between elementary and complex reaction rates

  • Differentiate between molecularity and reaction order

  • Determine rate constant and its application

  • Determine the dependence of reaction rate on concentration, temperature, and catalyst

  • Determine integrated rate equations for zero and first order reaction rates

  • Determine reaction rate constants for zeros and first order reactions rates

  • explain collision theory and its applications

Topics and subtopics in NCERT Solutions Class 12 Chemistry - Chapter 3 Chemical Kinetics

Section Name

Topic Name


Chemical Kinetics


Rate of a Chemical Reaction


Factors Influencing Rate of a Reaction


Integrated Rate Equations


Pseudo First Order Reaction


Temperature Dependence of the Rate of a Reaction


Collision Theory of Chemical Reactions

3.3 Integrated Rate Equations: Integrated rate equations refer to the relationship between reactant or product concentrations over time in a chemical reaction. These equations are based on the rate laws of various chemical reactions and help us understand how concentrations change over time in a reaction.

3.4 Pseudo First Order Reaction: A pseudo first order reaction is a chemical reaction that follows first order kinetics, but is not a real first order reaction. A pseudo first order reaction often occurs when the concentration of a single reactant is greater than that of the other reactants, so that the reaction is essentially dependent on the limiting reactant's concentration.

3.5 Temperature Dependence of the Rate of a Reaction: The equation relating reaction rate to temperature is referred to as the temperature dependent reaction rate equation.This reaction rate equation describes how reaction rate constant k changes over time as a function of temperature (T).

3.6 Collision Theory of Chemical Reactions: The collision theory is one of the most fundamental principles in chemical kinetics. It describes how chemical reactions take place on the molecular level. In order for a reaction to occur, the reactant molecules need to collide with one another in a certain way. The collision theory gives insight into the factors that affect reaction rates and the likelihood of successful reactions.

Key Features of Class 12 Chemistry Chapter 3 NCERT Solutions

Chemical kinetics is an important topic in Class 12 Chemistry. It is concerned with the rate at which chemical reactions take place. The main features and topics discussed in this chapter include:

Rate of Chemical Reaction: The rate of chemical reaction is the rate at which a chemical reaction occurs. It can be defined as the rate at which reactants change in concentration or the rate at which products are formed. It can also be expressed as the speed at which reactants disappear or the speed at which products are created.

Factors Affecting Reaction Rates: In this chapter, students learn about the different factors that affect reaction rates, such as the concentration of the reactants, the temperature, the presence of the catalysts, the surface area of the solid reactants, etc.

Order of a Reaction: The order of a reaction is the number of times the reactant is raised in the reaction rate equation. You can think of it as a zero order reaction, a first order reaction, a second order reaction, or even a fractional reaction. 

Integrated Rate Equations: Integrated rate equations are taken from the rate laws and give you the concentration of the reaction reactants or products over time.

Half life: A reaction’s half-life is the amount of time it takes for a reactant’s concentration to drop to 50% of its initial concentration. The half-life is one of the most important parameters used to describe a reaction’s kinetics.

Arrhenius Equation: The Arrhenius Equation explains how reaction rates are dependent on temperature and relates the constant reaction rate to activation energy/temperature.

Collision Theory: The Collision Theory describes how a chemical reaction occurs at a molecular level, focusing on collisions between reactive molecules with the correct energy and orientation.

Catalysis: Students learn about how catalysts affect reaction rates. A catalyst is a substance that increases a reaction rate by providing a different pathway for the reaction with less activation energy.

Importance of NCERT Solutions for Class 12 Chemistry Chapter 3 

Class 12 Chemistry Chapter 3 NCERT Solutions are very important for students studying Chemistry. Here are some reasons why NCERT solutions are very important:

Comprehensive understanding: NCERT solutions provide detailed and complete explanations of all the concepts in the chapter.

Clarity of concepts: NCERT solutions offer step by step solutions to the problems to help students understand the concepts better.

Structured and Organized: NCERT solutions are structured and organized, making it easy for students to understand and learn.

Practice Questions: NCERT solutions include various practice questions that cover various aspects of the chemical kinetics.

Exam Preparation: Chemistry kinetics is one of the most important topics in Class 12 Chemistry. It is often included in the board exams and in the competitive entrance examinations.

Self-assessment: NCERT solutions allow students to assess their own understanding of the chapter.

Conceptual Clarity: Some students find the topic of chemical kinetics difficult to understand. The solutions provide clear and easy-to-understand explanations.

Time Management: Having well-structured solutions saves time and effort. Students can refer to the solutions easily to clarify their doubts or to understand complex concepts, thus managing their study time efficiently.

Confidence Building: By understanding the subject of chemical kinetics, students gain confidence in their abilities. As they become more proficient in solving problems and comprehending concepts, they will become more confident.

Future Reference: NCERT Solutions provide students with a valuable reference for future reference. Whenever students need to revise a chapter or clarify a question, they can consult the solutions even after completing Class 12 syllabus.

Frequently Asked Questions

Question 1: What is chemical kinetics?
Answer 1: The field of chemical kinetics is concerned with reaction rates, the rate at which chemical reactions take place, and the mechanisms that affect reaction rates.

Question 2: What can I do to enhance my chemical kinetics knowledge?
Answer 2: To enhance your chemical kinetics knowledge, you can practice problem-solving, review examples, and revise concepts on a regular basis. You can also look at textbooks, online sources, and ask your teacher or tutor for help.


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