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In this article we are providing the NCERT Solutions for CBSE Class 12 Chemistry chapter 4, Chemical Kinetics. All the questions have been solved in the most appropriate and simple way so as to help students access the right study material for the exam preparation.
All the class 12 Chemistry NCERT Exemplar solutions have been collated in PDF format which students may easily download absolutely free.
Few problems along with their solutions from this chapter are given follows:
Q. The value of rate constant of a pseudo first order reaction
(a) depends on the concentration of reactants present in small amount
(b) depends on the concentration of reactants present in excess
(c) is independent of the concentration of reactants
(d) depends only on temperature
Ans. (b) depends on the concentration of reactants present in excess
The concentration of the reactants that is present in excess does not get altered much during the course of the reaction. Due to this reaction behaves as first order reaction. Such reactions are called pseudo first order reactions. Hence, concentration of reactants present in excess determines rate constant of a pseudo first order reaction.
CBSE Class 12 Chemistry Syllabus 2018 – 2019
Q. Which of the following statements are applicable to a balanced chemical equation of an elementary reaction?
(a) Order is same as molecularity (b) Order is less than the molecularity
(c) Order is greater than the molecularity (d) Molecularity can never be zero
Answer. (a, d)
For a balanced chemical equation of an elementary reaction order is same as molecularity and molecularity can never be zero, if molecularity of a reaction is considered to be zero. It means that no reactant is going to transform into product. Consider a chemical reaction.
Q. For which type of reactions, order and molecularity have the same value?
Ans. If the reaction is elementary reaction then order and molecularity have same value because elementary reaction proceeds in a single step.
Q. For a certain reaction large fraction of molecules has energy more than the threshold energy, yet the rate of reaction is very slow. Why?
Ans. According to collision theory apart from the energy considerations, the colliding molecules should also have proper orientation for effective collision.
This condition might not be getting fulfilled in the reaction as it shows the number of reactants taking part in a reaction, which can never be zero.
Find below the links to download Class 12 Chemistry NCERT Exemplar Solutions for chapter 4- Chemical Kinetics:
| Questions |
Link to Download Solutions |
| Multiple Choice Questions (Type-I) |
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| Multiple Choice Questions (Type-II) |
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| Short Answer Type Questions |
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| Matching Columns Type Questions |
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| Assertion and Reason Type Questions |
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| Long answer types questions |
Class 12 Chemistry NCERT Solutions: All Chapters
Class 12 Chemistry NCERT Exemplar Problems: Chemical Kinetics
NCERT Exemplar problems for class 12 Chemical Kinetics are all conceptual questions which are designed purely to check a student’s understanding about the various concepts and theories explained in the subject. These problems form the best practice source to prepare effectively for board exams and the medical entrance tests.
Important topics discussed in Class 12 Chemistry chapter – Chemical Kinetics, are:
- Rate of a Chemical Reaction
- Factors Influencing Rate of a Reaction
- Dependence of Rate on Concentration
- Rate Expression and Rate Constant
- Order of a Reaction
- Molecularity of a Reaction
- Integrated Rate Equations
- Zero Order Reactions
- First Order Reactions
- Half-Life of a Reaction
- Pseudo First Order Reaction
- Temperature Dependence of the Rate of a Reaction
- Effect of Catalyst
- Collision Theory of Chemical Reactions.
Download the complete NCERT Exemplar problems from the following link:
| Class 12 Chemistry NCERT Exemplar Problems: Chemical Kinetics |
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