CBSE Class 12 Chemistry - Chemical Kinetics Notes and Questions


CBSE Class 12 Chemistry Questions and basic easy to learn concepts/ notes Database for chapter Chemical  Kinetics . Based on CBSE and CCE guidelines. The students should practice these Questions to gain perfection which will help him to get more marks in CBSE examination. Based on CBSE and CCE guidelines. The preparation should be in a manner which helps the students to concentrate more in areas which carry more marks. Please refer to more CBSE Class XII sample papers, question papers, HOTs etc in other links.







Thermodynamics helps us to predict the feasibility of chemical reaction by using ∆G as parameter but it cannot tell everything about the rate of reaction. Rate of chemical reaction is studied in another branch of chemistry called Chemical Kinetics.

Chemical kinetics- The branch of physical chemistry which deals with the study of rate of reaction and their mechanism is called chemical kinetics.


Rate of chemical reaction-  The change in concentration of any reactant or product per unit time is called rate of reaction.




  1. Average rate of reaction- The rate of reaction measured over the long time interval is called average rate of reaction.


                                    Avg rate ∆x/∆t = -∆[R]/∆t = +∆[p]/∆t


  1. Instantaneous rate of reaction- The rate of reaction measured at a particular time is called instantaneous rate of reaction.


                                    Instantaneous rate dx/dt= -d[R]/dt=+d[P]/dt




  1. Concentration of reactant
  2. Surface area
  3. Temperature
  4. Nature of reactant
  5. Presence of catalyst
  6. Radiation


RATE CONSTANT (k)- It is equal to the rate of reaction when molecular concentration of reactant is at unity.


RATE LAW- The rate of reaction is directly proportional to the product of concentration of reactant and each concentration is raised to some power which may or may not be equal to stereochemistry experimentally.

Please refer to the attached file for CBSE Class 12 Chemistry - Chemical  Kinetics Notes and Questions

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