COMEDK UGET 2025 Chemical Kinetics Practice Questions with Solutions

COMEDK UGET 2025 Chemical Kinetics Practice Questions with Solutions: Chemical Kinetics is an important chapter from Class 12th Chemistry. It is also an essential chapter in the COMEDK UGET 2025 Chemistry syllabus. Chemical Kinetics covers around 8% weightage in the COMEDK question paper 2025 with around 5 questions coming from this chapter. It includes several subtopics such as Rate of Reaction, Catalysts, Arrhenius equation, and Collision Theory. To secure high marks in this section and improve your overall score, you must practice with COMEDK Chemical Kinetics sample questions shared on this page. These questions are part of previous years' exam papers and are likely to be asked in the upcoming test. By solving COMEDK UGET Chemical Kinematics practice questions, you can get a clearer understanding of the topics, the kind of questions expected to be asked, difficulty level of the topics and so on. In this article, we have provided the some of the important questions from Chemical Kinetics in COMEDK UGET 2025. You should practice these questions and concepts to ensure that you score the best possible marks in the COMEDK UGET 2025 exam. Alongside, you can also go through the various sub topics, expected questions weightage etc. 

Also Check - Do or Die Chapters for COMEDK UGET 2025 Chemistry

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COMEDK UGET 2025 Chemical Kinetics Important Topics

The detailed list of topics in Chemical Kinetics is mentioned in the COMEDK Chemistry syllabus 2025. Since all the questions in the exam will be asked from the syllabus, these topics are important must be covered to score decent marks. In the following table, we have provided the subtopics for COMEDK Chemical Kinetics chapter.

COMEDK UGET 2025 Chemical Kinetics Expected Weightage

The weightage of a topic in COMEDK UGET 2025 determines how many questions will be covered from that particular section. Chemical Kinetics being an important topic of the syllabus has a weightage of around 8% with around 4-5 questions expected in the question paper. You can check the expected COMEDK UGET Chemical Kinetics weightage 2025 below. 

Also Check - COMEDK Chapter Wise PYQs for Chemistry

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COMEDK UGET 2025 Chemical Kinetics Practice Questions with Solutions

In this section, we have provided some of the most important COMEDK UGET 2025 Chemical KInetics practice questions. If you are preparing for the COMEDK entrance exam, you must solve these questions to ensure the best performance and a comprehensive preparation of Chemical KInetics topic.

Q1. For a given reaction, X(g) + Y(g) →Z(g), the order of reaction with respect to X and Y are m and n respectively. If the concentration of X is tripled and Y is decreased to one third, what is the ratio between the new rate to the original rate of the reaction?

a. 3^(m-n)

b. 3^(n-m)

c. (m+n)

d. (m-n)

Ans.a. 3^(m-n)

Solution: To determine the ratio between the new rate and the original rate of the reaction given the changes in concentrations of X and Y, we need to start by writing the rate law for the reaction:

Initial rate = k[X]^m[Y]ⁿ

Where k is the rate constant

[X] is the concentration of X

[Y] is the concentration of Y

m is the order of reaction with respect to X

n is the order of reaction with respect to Y

Let the initial concentration of X and Y be [X] and [Y] respectively, the initial rate of reaction is:

Initial rate = k[X]^m[Y]ⁿ

The new rate after increasing the concentration of [X] increased by 3 times and [Y] decreased by 1/3rd. The new rate is

k(3[X]m).⅓([Y])ⁿ

Simplifying this expression:

New rate = k[X]^m[Y]ⁿ.3^m/3ⁿ

New rate = Initial rate. 3^m/3ⁿ

New rate = Initial rate. 3^(m-n)

Thus, the ratio between the new rate and the original rate of the reaction is:

New rate/Initial rate = 3^(m-n)

Q2. How much faster would a reaction proceed at 25°C than at 0°C if the activation energy is 65 kJ?

a. 4 times

b. 11 times

c. 10 times

d. 5 times

Ans. b. 11 times

Solution: We know

2.303 logK₂/k₁ = Ea/R(T2-T1/T1T2)

2.303 logK₂/k₁ = (65x 103)/8.314[25/(298 x 273)]

k₂/k = 11.5.

The reaction would proceed 11 times faster

Q3. At 300 K, the half-life period of a gaseous reaction at an initial pressure of 40kPa is 350s. When pressure is 20kPa, the half life period is 175s. What is the order of the reaction?

a. Three

b. Two

c. One

d. Zero

Ans. d. Zero

Solution: We know that

(t_1/2)₁/(t_1/2)2 = (p₂/p₁)^n-1

where, n is the order of reaction and t_1/2 is half-life

Simplifying this equation we get,

n-1 = -1

n = 0.

Q4. For a reaction, 2A + B →Products, if the concentration of B is kept constant and the concentration of B is doubled, what is the rate of reaction?

a. Doubled

b. Quadrupled

c. Halved

d. No change

Ans. b. Quadrupled

Solution: The rate of reaction for

2A + B →Product is rate = k[A]²[B]

If concentration of A is doubled,

Rate’ = [2A]²[B] = 4k[A]²[B]

Rate’ = 4 Rate

Q5. A newly prepared radioactive nuclide has a decay constant of 6.93 s^-1. What is the half-life of the nuclide?

a. 0.1 s

b. 0.2 s

c. 0.3 s

d. 0.4 s

Ans.a. 0.1 s

Solution: Radioactive nuclide follows first order kinetics

t_1/2 = 0.693/λ

= 0.1 s

Before solving Chemical Kinetics practice questions, brush up your memory on all the important chemical formulas, constants, and equations from COMEDK 2025 Chemistry formula sheet. It will help you solve the questions more easily and also save you valuable time. Most importantly, assess your marks after solving COMEDK UGET 2025  Chemical Kinetics sample questions and reflect on the mistakes before taking the final test!

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