Class 12 Chemistry Chemical Kinetics Notes and Important Questions
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Notes for Class 12 Chemical Kinetics (Chemistry) are shown above.
Practice
Important Questions
A hypothetical reaction, 3X + 2Y ⟶ Z
Expt | [X] (mol L⁻¹) | [Y] (mol L⁻¹) | The Rate of formation of Z (mol L⁻¹ min⁻¹) |
|---|---|---|---|
1 | 0.1 | 0.1 | 1 × 10⁻³ |
2 | 0.1 | 0.4 | 4 × 10⁻³ |
3 | 0.2 | 0.4 | 8 × 10⁻³ |
4 | 0.5 | A | 1.8 × 10⁻² |
a) Determine the value of rate constant.
b) Calculate the value of A.
c) Write rate law equation.
What is pseudo first order reaction? Write one suitable example.
Draw the diagram showing effective collision.
Write down the differences between rate of reaction and rate constant.
For the reaction $2A + B \rightarrow \text{product}$, following data were obtained:
order with respect to $A$ and $B$. $(1)$
the value of the rate constant of the reaction
the rate of reaction when the concentration of $A$ and $B$ is $0.5\ \text{M}$ and $0.4\ \text{M}$, respectively.
Four metals $A$, $B$, $C$ and $D$ react in the following way:
$B$ displaces only $A$ from solution. Only $D$ and $C$ displace hydrogen from $1\ \text{M HCl}$ solution. None of the metals will displace C from solution. Answer the followings:
Make the activity series of four metals with hydrogen
The standard potential for the following electrodes are:
Construct the galvanic cell by pointing out cathode and anode.
With $1\ \text{M}$ solution of the ions, what will be EMF of cell?
Will the reaction occur:
Occur? Give reasons. $(1)$
Define instantaneous rate of reaction. Write down the rate expressions of the following reaction.
2N₂O₅(g) → 4NO₂(g) + O₂(g)
If 2.24 litres of O₂ at NTP is produced in 30 minutes, what is the rate of disappearance of N₂O₅(g)?
The half-life of a certain reaction is 50 seconds, and it remains constant even if the initial concentration of the reaction is doubled. What is the order of the reaction?
Zero-order reaction
First-order reaction
Second-order reaction
Pseudo-first order reaction
For a gaseous reaction:
2A + B ⟶ C. The reaction is first order with respect to A and zero order with respect to B.
Define order of reaction.
Write the rate law for above reaction.
How many times the rate of reaction increase if the concentration of both A and B are doubled?
If the temperature increases by 20°C what will be its effect in rate of reaction?
Half life period is directly proportional to the initial concentration of the reactant. What is the order of the reaction?
zero order
second order
first order
third order
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Exam
Past Question Analysis
Historical exam-pattern data from past NEB question papers — not a prediction of future questions.
2
Question Items
6
Total Marks
1
Papers Appeared In
| Year | Question Items | Marks |
|---|---|---|
| 2082 | 2 | 6 |
Also appears in 4 model questions (not counted above — model sets aren't actual NEB exam history).
Chemical Kinetics explores the rate at which chemical reactions occur and the factors affecting reaction rates. Students study rate laws, rate constants, order and molecularity, integrated rate equations, half-life, collision theory, activation energy, Arrhenius equation and catalysis.
This page covers Chemical Kinetics, chapter 3 of 22 in the Class 12 Chemistry syllabus set by the National Examination Board (NEB). 10 important questions for this chapter are available, each with a full solution.
For numerical and derivation-based chapters like this one, working through past NEB questions is usually more useful than re-reading notes alone — try solving each important question above before checking the solution, then compare your working step by step.