CBSE Class 12 Chemistry Chemical Kinetics Assignment

Read and download free pdf of CBSE Class 12 Chemistry Chemical Kinetics Assignment. Get printable school Assignments for Class 12 Chemistry. Class 12 students should practise questions and answers given here for Unit 04 Chemical Kinetics Chemistry in Class 12 which will help them to strengthen their understanding of all important topics. Students should also download free pdf of Printable Worksheets for Class 12 Chemistry prepared as per the latest books and syllabus issued by NCERT, CBSE, KVS and do problems daily to score better marks in tests and examinations

Assignment for Class 12 Chemistry Unit 04 Chemical Kinetics

Class 12 Chemistry students should refer to the following printable assignment in Pdf for Unit 04 Chemical Kinetics in Class 12. This test paper with questions and answers for Class 12 Chemistry will be very useful for exams and help you to score good marks

Unit 04 Chemical Kinetics Class 12 Chemistry Assignment

 
CBSE Class 12 Chemistry Chemical Kinetics Assignment
 
6. One gram of pulverized wood burns faster than a gram piece of wood. Explain.
Ans. One gram of pulverized wood has more surface area and therefore, it burns faster than 1 gram of wood.

7. What is meant by effective collision ?
Ans- -The collision that leads to the formation of product molecule is called effective collision

8. Explain the term activated complex .
Ans - It is defined as intermediate compound between reactants and products which is highly unstable ,has the highest energy and readily changes into product

9. Define pseudo unimolecular reaction . Give two examples .
Ans - The reaction which is bimolecular but its order is one is called pseudo unimolecular reaction ,
e.g. CH3COOC2H5+H2O in presence of H+ → CH3COOH+C2H5OH

10. For a reaction: A + B → Products.
The rate law expression is, rate = k [A]1/3 .[B]2
What is the order of the reaction?
Ans: Order of the reaction = 1/3 + 2 = 7/2

LEVEL -2

1. The rate constant for a reaction of zero order in A is 0.0030 mol L−1 s−1. How long will it take for the initial concentration of A to fall from 0.10 M to 0.075 M?
Ans. For a first order reaction,

CBSE Class 12 Chemistry - Chemical Kinetics Assignment
CBSE Class 12 Chemistry - Chemical Kinetics Assignment

 Important Questions for NCERT Class 12 Chemistry Chemical Kinetics
 

Question. The rate constant of first order reaction is 3 × 10–6 per second. The initial concentration is 0.10 M.
The initial rate is:
(a) 3 × 10–7 mol/litre/sec
(b) 3 × 10–8 mol/litre/sec
(c) 3 × 10–5 mol/litre/sec
(d) 3 × 10–8 mol/litre/sec

Answer    A

Question. The half-life of a substance in a certain enzymecatalysed reaction is 138 s. The time required for the concentration of the substance to fall from 1.28 mg L–1 to 0.04 mg L–1 is
(a) 414 s
(b) 552 s
(c) 690 s
(d) 276 s 

Answer    C

Question. Half-life period of a first order reaction is 1386 seconds. The specific rate constant of the reaction is
(a) 0.5 × 10–2 s–1
(b) 0.5 × 10–3 s–1
(c) 5.0 × 10–2 s–1
(d) 5.0 × 10–3 s–1 

Answer   B

Question. The activation energy for a simple chemical reaction A ⇌ B is Ea in forward direction. The activation energy for reverse reaction
(a) is negative of Ea
(b) is always less than Ea
(c) can be less than or more than Ea
(d) is always double of Ea. 

Answer   C

Question. When a biochemical reaction is carried out in laboratory, outside the human body in absence of enzyme, then rate of reaction obtained is 10–6 times, the activation energy of reaction in the presence of enzyme is
(a) 6/RT
(b) P is required
(c) different from Ea obtained in laboratory
(d) can’t say anything. 

Answer   C

Question. Which of the following statement is true for the reaction, H2 + Br2 →2HBr . The rate law is [ H2 ][ Br2 ]1/ 2 dx/dt=k  
(a) order of reaction is 1.5
(b) molecularity of the reaction is 2
(c) by increasing the concentration of Br2 four times the rate of reaction is doubled
(d) all the above are correct.

Answer    D

Question. In a reaction, A + B → product, rate is doubled when the concentration of B is doubled, and rate increases by a factor of 8 when the concentration of both the reactants (A and B) are doubled, rate law for the reaction can be written as
(a) rate = k[A][B]2
(b) rate = k[A]2[B]2
(c) rate = k[A][B]
(d) rate = k[A]2[B]

Answer    D

Question. For the reaction : H2 Cl2 →sunlight 2HCl the order of reaction is 
(a) 0
(b) 2
(c) 1
(d) 3

Answer  A

Question. The rate of a first order reaction is 1.5 × 10–2 mol L–1 min–1 at 0.5 M concentration of the reactant. The half-life of the reaction is
(a) 0.383 min
(b) 23.1 min
(c) 8.73 min
(d) 7.53 min

Answer   B

Question. Activation energy of a chemical reaction can be determined by
(a) evaluating rate constants at two different temperatures
(b) evaluating velocities of reaction at two different temperatures
(c) evaluating rate constant at standard temperature
(d) changing concentration of reactants. 

Answer   A
 
Please click the link below to download CBSE Class 12 Chemistry Chemical Kinetics Assignment
Unit 12 Aldehydes, Ketones and Carboxylic Acids
CBSE Class 12 Chemistry Aldehydes Ketons Carboxylic Acids Questions

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CBSE Class 12 Chemistry Unit 04 Chemical Kinetics Assignment

We hope you liked the above assignment for Unit 04 Chemical Kinetics which has been designed as per the latest syllabus for Class 12 Chemistry released by CBSE. Students of Class 12 should download and practice the above Assignments for Class 12 Chemistry regularly. We have provided all types of questions like MCQs, short answer questions, objective questions and long answer questions in the Class 12 Chemistry practice sheet in Pdf. All questions have been designed for Chemistry by looking into the pattern of problems asked in previous year examinations. 

Assignment for Chemistry CBSE Class 12 Unit 04 Chemical Kinetics

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Unit 04 Chemical Kinetics Assignment Chemistry CBSE Class 12

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Unit 04 Chemical Kinetics Assignment CBSE Class 12 Chemistry

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CBSE Chemistry Class 12 Unit 04 Chemical Kinetics Assignment

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