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NCERT Solutions for Class 12 Chemistry Chemistry I Chapter 4 Chemical Kinetics

Chemical Kinetics Here is the CBSE Chemistry Chapter 4 for Class 12 students. Summary and detailed explanation of the lesson, including the definitions of difficult words. All of the exercises and questions and answers from the lesson's back end have been completed. NCERT Solutions for Class 12 Chemistry Chemical Kinetics Chapter 4 NCERT Solutions for Class 12 Chemistry Chemical Kinetics Chapter 4 The following is a summary in Hindi and English for the academic year 2025-26. You can save these solutions to your computer or use the Class 12 Chemistry.

Question 1

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For the reaction R → P, the concentration of a reactant changes from 0.03 M to 0.02 M is 25 minutes. Calculate the average rate of reaction using units of time both in minutes and seconds.

Solution

Given that
Initial concentration, [R1] = 0.03
Final concentration, [R2] = 0.02
Time taken ∆t = 25 min = 25 × 6 0 = 1500 sec (1 min = 60 sec )
The formula of average rate of change

r_{av} = \frac{- ∆ R}{∆ t} = \frac{∆ [P]}{∆ t}

(i) Average rate

= \frac{(0.03 - 0.02) M}{25 \times 60 \sec} = \frac{0.01 M}{25 \times 60 s} = 6.66 M s^{- 1}

(ii) Average rate

= \frac{(0.03 - 0.02) M}{25 \min} = \frac{0.01 M}{25} = 0.0004 {Ms}^{- 1} .

Question 2

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In a reaction 2A → Products, the concentration of A decreases from 0.5 mol to 0.4 mol L^–1 in 10 minutes. Calculate the rate during this interval.

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Question 3

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For a reaction, A + B → Product; the rate law is given by, r = k[ A]^1/2 [B]². What is the order of reaction?

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Question 4

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The conversion of molecules X to Y follows second order kinetics. If concentration of X is increased to three times how will it affect the rate of formation of Y?

Easy

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Question 5

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A first order reaction has a rate constant 1.15 x 10^–3 s^–1. How long will 5 g of this reactant take to reduce to 3 g?

Easy

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Question 6

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Time required to decompose SO₂ Cl₂ to half its initial amount is 60 minutes. If the decomposition is a first order reaction, calculate the rate constant of the reaction.

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Question 7

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What will be the effect of temperature on rate constant?

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Question 8

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The rate of the chemical reaction doubles for an increase of 10 k in absolute temperature from 298 K. Calculate E_a.

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Question 9

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The activation energy for the reaction
2HI (g) → H₂ + I₂(g)
is 209.5 kJ mol^–1 at 581 k. Calculate the fraction of molecules of reactants having energy equal to or greater than activation energy?

Easy

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Question 10

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For the reaction A B, the rate of reaction becomes twenty seven times when the concentration of A is increased three times.
What is the order of the reaction?

Easy

View solution

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NCERT Solutions for Class 12 Chemistry Chemistry I Chapter 4 Chemical Kinetics

For the reaction R → P, the concentration of a reactant changes from 0.03 M to 0.02 M is 25 minutes. Calculate the average rate of reaction using units of time both in minutes and seconds.

In a reaction 2A → Products, the concentration of A decreases from 0.5 mol to 0.4 mol L^–1 in 10 minutes. Calculate the rate during this interval.

For a reaction, A + B → Product; the rate law is given by, r = k[ A]^1/2 [B]². What is the order of reaction?

The conversion of molecules X to Y follows second order kinetics. If concentration of X is increased to three times how will it affect the rate of formation of Y?

A first order reaction has a rate constant 1.15 x 10^–3 s^–1. How long will 5 g of this reactant take to reduce to 3 g?

Time required to decompose SO₂ Cl₂ to half its initial amount is 60 minutes. If the decomposition is a first order reaction, calculate the rate constant of the reaction.

What will be the effect of temperature on rate constant?

The rate of the chemical reaction doubles for an increase of 10 k in absolute temperature from 298 K. Calculate E_a.

The activation energy for the reaction
2HI (g) → H₂ + I₂(g)
is 209.5 kJ mol^–1 at 581 k. Calculate the fraction of molecules of reactants having energy equal to or greater than activation energy?

For the reaction A B, the rate of reaction becomes twenty seven times when the concentration of A is increased three times.
What is the order of the reaction?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

For Daily Free Study Material Join wiredfaculty

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NCERT Solutions for Class 12 Chemistry Chemistry I Chapter 4 Chemical Kinetics

For the reaction R → P, the concentration of a reactant changes from 0.03 M to 0.02 M is 25 minutes. Calculate the average rate of reaction using units of time both in minutes and seconds.

In a reaction 2A → Products, the concentration of A decreases from 0.5 mol to 0.4 mol L–1 in 10 minutes. Calculate the rate during this interval.

For a reaction, A + B → Product; the rate law is given by, r = k[ A]1/2 [B]2. What is the order of reaction?

The conversion of molecules X to Y follows second order kinetics. If concentration of X is increased to three times how will it affect the rate of formation of Y?

A first order reaction has a rate constant 1.15 x 10–3 s–1. How long will 5 g of this reactant take to reduce to 3 g?

Time required to decompose SO2 Cl2 to half its initial amount is 60 minutes. If the decomposition is a first order reaction, calculate the rate constant of the reaction.

What will be the effect of temperature on rate constant?

The rate of the chemical reaction doubles for an increase of 10 k in absolute temperature from 298 K. Calculate Ea.

The activation energy for the reaction2HI (g) → H2 + I2(g)is 209.5 kJ mol–1 at 581 k. Calculate the fraction of molecules of reactants having energy equal to or greater than activation energy?

For the reaction A B, the rate of reaction becomes twenty seven times when the concentration of A is increased three times.What is the order of the reaction?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

In a reaction 2A → Products, the concentration of A decreases from 0.5 mol to 0.4 mol L^–1 in 10 minutes. Calculate the rate during this interval.

For a reaction, A + B → Product; the rate law is given by, r = k[ A]^1/2 [B]². What is the order of reaction?

A first order reaction has a rate constant 1.15 x 10^–3 s^–1. How long will 5 g of this reactant take to reduce to 3 g?

Time required to decompose SO₂ Cl₂ to half its initial amount is 60 minutes. If the decomposition is a first order reaction, calculate the rate constant of the reaction.

The rate of the chemical reaction doubles for an increase of 10 k in absolute temperature from 298 K. Calculate E_a.

The activation energy for the reaction
2HI (g) → H₂ + I₂(g)
is 209.5 kJ mol^–1 at 581 k. Calculate the fraction of molecules of reactants having energy equal to or greater than activation energy?

For the reaction A B, the rate of reaction becomes twenty seven times when the concentration of A is increased three times.
What is the order of the reaction?