CBSE Class 12 Chemistry Chemical Kinetics Worksheet Set B

Read and download free pdf of CBSE Class 12 Chemistry Chemical Kinetics Worksheet Set B. Students and teachers of Class 12 Chemistry can get free printable Worksheets for Class 12 Chemistry in PDF format prepared as per the latest syllabus and examination pattern in your schools. Standard 12 students should practice questions and answers given here for Chemistry in Grade 12 which will help them to improve your knowledge of all important chapters and its topics. Students should also download free pdf of Class 12 Chemistry Worksheets prepared by school teachers as per the latest NCERT, CBSE, KVS books and syllabus issued this academic year and solve important problems provided here with solutions on daily basis to get more score in school exams and tests

Chemical Kinetics Class 12 Chemistry Worksheet Pdf

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

Class 12 Chemistry Worksheet for Chemical Kinetics

Chapter:4 (Chemical Kinetics)

State whether given statement is true or false.

1. The unit of K for first order reaction is molL-1s-1. ( )

2. The radioactive decay follows zero order kinetics. ( )

3. For r =k[A]2[B],the order of reaction is 3 ( )

4. For second order reaction unit of k is mol-2L2s-1. ( )

5. For a reaction order and molecularity are always same. ( )

6. Order of reaction is always a whole number whereas molecularity can be fractional. ( )

MCQ

1.The order of reaction for,r=k[A]2[B] is

(a). 1 b) 0 (c)2 (d) 3

2.A reaction 50% complete in 2 hours and 75% in 4 hours, the order of reaction will be

(a).0 b) 1 (c)2 (d) 3

3.For a reaction A+B → C,the rate law is given by r=k[A]1/2[B]2 the order of reaction is:

(a).0 b) 5/2 (c)2 (d) 3/2

4. What is the unit of K if rate ==K{A}2{B}

(a) s-1 (b) mol L-1 (c) mol-2L2s-1 (d) mol-1Ls-1

5.What is the molecularity of reaction for the following elementary reaction:

2A+B------------------------→C

(a) 1 (b) 2 (c) 3 (d) 0

6.What is the order for following photochemical reaction:

H2+Cl2------------→2HCl 

Important Questions for NCERT Class 12 Chemistry Chemical Kinetics

 

Question. For the reaction; 2N2O5 → 4NO2 + Orate and rate constant are 1.02 × 10–4 and 3.4 × 10–5 sec–1 respectively, then concentration of N2O5 at that time will be
(a) 1.732
(b) 3
(c) 1.02 × 10–4
(d) 3.4 × 105

Answer   B

Question. The given reaction,
2FeCl3 + SnCl2 → 2FeCl2 + SnClis an example of
(a) third order reaction
(b) first order reaction
(c) second order reaction
(d) none of these.

Answer   A

Question. The rate constant for a first order reaction is 4.606 × 10–3 s–1. The time required to reduce 2.0 g of the reactant to 0.2 g is
(a) 100 s
(b) 200 s
(c) 500 s
(d) 1000 s 

Answer    C

Question. If the rate constant for a first order reaction is k, the time (t) required for the completion of 99% of the reaction is given by
(a) t = 2.303/k
(b) t = 0.693/k
(c) t = 6.909/k
(d) t = 4.606/k

Answer   D

Question. A first order reaction has a rate constant of 2.303 × 10–3 s–1. The time required for 40 g of this reactant to reduce to 10 g will be [Given that log10 2 = 0.3010]
(a) 230.3 s
(b) 301 s
(c) 2000 s
(d) 602 s

Answer   D

Question. The correct difference between first and second order reactions is that
(a) the rate of a first-order reaction does not depend on reactant concentrations; the rate of a second-order reaction does depend on reactant concentrations
(b) the half-life of a first-order reaction does not depend on [A]0 ; the half-life of a second-order reaction does depend on [A]0
(c) a first-order reaction can be catalysed; a secondorder reaction cannot be catalysed
(d) the rate of a first-order reaction does depend on reactant concentrations; the rate of a secondorder reaction does not depend on reactant concentrations. 

Answer   B

Question. When initial concentration of the reactant is doubled, the half-life period of a zero order reaction
(a) is halved
(b) is doubled
(c) is tripled
(d) remains unchanged.

Answer   B

Question. A first order reaction has a specific reaction rate of 10–2 sec–1. How much time will it take for 20 g of the reactant to reduce to 5 g?
(a) 138.6 sec
(b) 346.5 sec
(c) 693.0 sec
(d) 238.6 sec 

Answer   A

Question. The rate of first-order reaction is 0.04 mol L–1 s–1 at 10 seconds and 0.03 mol L–1 s–1 at 20 seconds after initiation of the reaction. The half-life period of the reaction is
(a) 44.1 s
(b) 54.1 s
(c) 24.1 s
(d) 34.1 s

Answer   C

Question. When initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction is
(a) second
(b) more than zero but less than first
(c) zero
(d) first. 

Answer   D


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