Chemistry Reaction Kinetics MCQs Chapter 11 Class 11

Chemistry Reaction Kinetics MCQs – Chapter 11 Class 11

Chemistry Reaction Kinetics is an important chapter of Class 11 Chemistry and plays a key role in FSc Part-I exams and entry test preparation. MCQs from this chapter are frequently included in MDCAT, NUMS, AKU, NUST, UET ECAT, and board examinations. This chapter covers essential topics such as rate of reaction, factors affecting reaction rate, rate laws, order and molecularity of reactions, integrated rate equations, and collision theory.

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Chemistry Ch 11 Class 11 REACTION KINETICS

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1 / 56

The colour of methyl orange in base is?

NTS 2015 SMBBMC
Chemistry
Acids, Bases and Salts
Elimination Tool:

A) Red

B) yellow

C) orange

D) pink

2 / 56

In a zero-order reaction, the rate is independent of:

NTS 2019
Chemistry
Reaction Kinetics
Elimination Tool:

A) The temperature of the reaction

B) The concentration of reactants.

C) Concentration of products

D) Catalyst used

3 / 56

Half-life of iron is? (A=59)

44.5 days

1.3 million years

3.8 days

2.5 billion years

4 / 56

Methyl orange is _______ in acidic solutions.

NTS 2018
Chemistry
Acids, Bases and Salts
Elimination Tool:

A) Yellow

B) Pink

C) Orange

D) Red

5 / 56

In a reversible reaction, catalyst lowers the action energy of the:

NUMS 2020
Chemistry
Reaction Kinetics
Chemical Equilibrium
Elimination Tool:

A) Forward reaction

B) Reverse reaction

C) Forward as well as reverse reaction

D) Forward reaction but increases that of the reverse reaction

6 / 56

Half-life of an element is 5 days. If we have 50,000 of its atoms, then how many atoms would be left after 10 days?

15000

25000

50000

None of these

7 / 56

For a single step reaction A ->B + 2C, the rate law is:

NUMS 2017
Chemistry
Reaction Kinetics
Elimination Tool:

A) Rate = k

B) Rate = k[A][B]

C) Rate = k[A]

D) Rate = k[B]

8 / 56

For the reaction, A(g) -> products:

When the concentration of A(g) doubles, the rate of reaction increases four folds, which means it is:

PMC 2020
Chemistry
Reaction Kinetics
Elimination Tool:

A) Negative order reaction

B) First order reaction

C) Zero order reaction

D) Second order reaction

9 / 56

Which of the following statements best describes how a catalyst works

NUMS 2018
Chemistry
Reaction Kinetics
Elimination Tool:

A) A catalyst changes the potential energies of the reactants and products

B) A catalyst decreases the temperature of the reaction which leads to a faster rate

C) A catalyst lowers the activation energy barrier for the reaction by providing a different reaction mechanism.

D) A catalyst raises the activation energy for the reaction which produces a faster rate

10 / 56

The process of bringing an element in use after its complete half-life is:

Rejuvenation

Revoking

Recycling

None of these

11 / 56

Rate determining step of a chemical reaction which occur in more than one step depends upon the

PMC Sample 1
Chemistry
Reaction Kinetics
Elimination Tool:

A) fastest step

B) Slowest Step

C) catalyst used

D) Temperature of reaction

12 / 56

Farming salt is:

NUMS 2014
Chemistry
Acids, Bases and Salts
Elimination Tool:

A) NaCl

B) HF

C) KHF2

D) KClO3

13 / 56

Blue litmus turns red in a solution of PH

NUMS 2014
Chemistry
Acids, Bases and Salts
Elimination Tool:

A) Below 7

B) 7

C) Above 7

D) at all 7

14 / 56

Reaction of Sodium with water is an example of

PMC Sample 3
Chemistry
Reaction Kinetics
Elimination Tool:

A) Reversible reaction

B) Endothermic

C) Irreversible

D) Slow

15 / 56

Which of the following statements is correct?

NTS 2017
Chemistry
Acids, Bases and Salts
Elimination Tool:

A) H3PO3 is dibasic and reducing

B) H3PO3 is tribasic and reducing

C) H3PO3 is tribasic and non-reducing

D) H3PO3 is dibasic and non-reducing

16 / 56

The rate of reaction:

PMC Sample 2
Chemistry
Reaction Kinetics
Elimination Tool:

A) Increases as the reaction proceeds

B) Decreases as the reaction proceeds

C) Remains unchanged

D) None of these options is correct

17 / 56

The rate constant of a first-order reaction is 3 x 10-6 per second.

If the initial concentration is 0.10 M, the initial rate of reaction is:

NUMS 2018
Chemistry
Reaction Kinetics
Elimination Tool:

A) 3 x 10-3 Ms-1

B) 3 x 10-4 Ms-1

C) 3 x 10-6 Ms-1

D) 3 x 10-7 Ms-1

18 / 56

What is the order of the following reaction:

2NO +O2 -> 2NO2

NTS 2019
Chemistry
Reaction Kinetics
Elimination Tool:

A) 0

B) 1

C) 2

D) 3

19 / 56

Activated complex is formed due to

PMC Sample 3
Chemistry
Reaction Kinetics
Elimination Tool:

A) Pressure

B) Temperature

C) Effective collision

D) Ineffective collision

20 / 56

Common name of Octadecanoic acid is:

NTS 2016 DUHS & JSMU
Chemistry
Acids, Bases and Salts
Macromolecules
Elimination Tool:

A) Propionic acid

B) Stearic acid

C) Palmitic acid

D) Formic acid

21 / 56

The effect of temperature on the rate of a reaction is given by:

NUMS 2020
Chemistry
Reaction Kinetics
Elimination Tool:

A) Henderson’s equation

B) General gas equation

C) Arrhenius equation

D) Van der Waals equation

22 / 56

For which of the following order of the reaction, rate of reaction is inversely proportional to the concentration reaction?

PMC 2020
Chemistry
Reaction Kinetics
Elimination Tool:

A) 1st order reaction

B) 2nd order reaction

C) Negative order of reaction

D) Zero order of reaction

23 / 56

Metaboric acid when heated produces:

NTS 2016 DUHS & JSMU
Chemistry
Acids, Bases and Salts
Elimination Tool:

A) B2O3

B) HBO2

C) H2B4O7

D) H3BO3

24 / 56

Type of reactants or product decides the nature of method adapted for finding

PMC Sample 1
Chemistry
Reaction Kinetics
Elimination Tool:

A) Rate constant

B) Enthalpy

C) Temperature

D) Rate of a Reaction

25 / 56

For a reaction 2A + 3B -> C
The rate law expression is given by rate = K [A]1[B]2. The order of the reaction with respect to A, B and overall order of reaction are:

NUMS 2015
Chemistry
Reaction Kinetics
Elimination Tool:

A) 2, 1, 3

B) 1, 2, 3

C) 0, 1, 2

D) 2, 1, 0

26 / 56

A certain chemical reaction follows the
following rate law:

Rate =K [A] [B]2 The order of reaction is:

NTS 2011
Chemistry
Reaction Kinetics
Elimination Tool:

A) 1

B) 2

C) 3

D) 4

27 / 56

A catalyst is a substance which:

NUMS 2017
Chemistry
Reaction Kinetics
Elimination Tool:

A) Stops the reaction

B) Decreases the rate of reaction

C) Alters the rate of reaction

D) Increases the rate of reaction

28 / 56

The change in concentration of reactants or products per unit time is

PMC Sample 3
Chemistry
Reaction Kinetics
Elimination Tool:

A) rate constant

B) reaction speed

C) Rate of a reaction

D) All of these

29 / 56

If the reaction, P + Q → R + S, is described as being of zero-order with respect to P, it means that:

NTS 2012
Chemistry
Reaction Kinetics
Elimination Tool:

A) P is a catalyst in this reaction

B) No P molecules possess sufficient energy to react

C) The concentration of P does not change during the reaction

D) The rate of reaction is independent of the concentration of P

30 / 56

The rate of chemical reaction:

PMC Sample 2
Chemistry
Reaction Kinetics
Elimination Tool:

A) Increases as the reaction proceeds

B) Decrease as the reaction proceeds

C) May increase or decrease during the reaction

D) Remains constant as the reaction proceeds

31 / 56

“The sum of all the exponents to which the molar concentration in terms in the rate equation are raised” defines:

NUMS 2016
Chemistry
Reaction Kinetics
Elimination Tool:

A) Rate of reaction

B) Order of reaction

C) Type of reaction

D) Product of reaction

32 / 56

The unit of rate of reaction is:

NTS 2011
Chemistry
Reaction Kinetics
Elimination Tool:

A) Mole (dm3) sec

B) Mole (dm3) sec-1

C) Mole(dm-3) sec -1

D) Mole(dm3)sec-2

33 / 56

A catalyst:

NTS 2016 DUHS & JSMU
Chemistry
Reaction Kinetics
Elimination Tool:

A) Increases the rate of forward reaction

B) Increases the rate of both forward and reverse reaction

C) Changes equilibrium position

D) Increases the rate of reverse reaction

34 / 56

The influence of temperature on reaction rate is predicted by:

NUMS 2019 Reconduct
Chemistry
Reaction Kinetics
Elimination Tool:

A) Free energy change

B) Van Der Waals equation

C) Arrhenius equation

D) Kinetic equation

35 / 56

The rate of reaction:

NUMS 2020
Chemistry
Reaction Kinetics
Elimination Tool:

A) Increases as the reaction proceeds

B) Decreases as the reaction proceeds

C) Remains the same as the reaction proceeds

D) May decrease or increase as the reaction proceeds

36 / 56

What is the effect of catalyst in a reaction?

Increases the rate of reaction

Decreases the rate of reaction

Keeps the rate constant

None of these

37 / 56

Instantaneous rate of reaction is the rate at any

PMC Sample 2
Chemistry
Reaction Kinetics
Elimination Tool:

A) At Equilibrium

B) one instant

C) Given Temperature

D) Given Pressure

38 / 56

Solar energy is stored through solar panels in?

Dry cell

Magnesium cell

Nickel Cadmium battery

None of these

39 / 56

H2SO4 has great affinity for water because:

NTS 2014
Chemistry
Acids, Bases and Salts
Elimination Tool:

A) It decomposes the acid

B) It hydrolyses the acid

C) Acid decomposes the water

D) Acid forms hydrates with water

40 / 56

The chemical reaction in which reactions require high amount of activation energy are generally:

NTS 2014
Chemistry
Reaction Kinetics
Elimination Tool:

A) Slow

B) First fast then slow

C) First slow then fast

D) Spontaneous

41 / 56

Which of the following oxides is amphoteric in character?

NUMS 2014
Chemistry
Acids, Bases and Salts
Elimination Tool:

A) CaO

B) CO2

C) SiO2

D) SnO2

42 / 56

As the concentration of reactant increases, the rate of reaction also increases, it is because:

NUMS 2018
Chemistry
Reaction Kinetics
Elimination Tool:

A) K.E. increases in molecules

B) Oscillation increases between molecules

C) Collisions frequency increases

D) Temperature of molecules increases

43 / 56

If energy of the activated complex is close to energy of reactants, it means that the reaction is:

NUMS 2019 Reconduct
Chemistry
Reaction Kinetics
Elimination Tool:

A) Fast

B) Moderate

C) Slow

D) Very slow

44 / 56

The rate of a chemical reaction is directly proportional to the product of active masses of the reactants, it is referred to as:

NTS 2018
Chemistry
Reaction Kinetics
Elimination Tool:

A) Law of conservation of energy

B) Law of mass action

C) Law of conservation of mass

D) Active mass law

45 / 56

Sum of all the exponents of the molar concentration of the reactant present in the rate equation is known as:

NTS 2012
Chemistry
Reaction Kinetics
Elimination Tool:

A) Molecularity

B) Order of reaction

C) Rate of reaction

D) gradient

46 / 56

75% of a first order reaction is completed in 36 minutes. What is the half life of the reaction?

NUMS 2017
Chemistry
Reaction Kinetics
Elimination Tool:

A) 27 min

B) 24 min

C) 18 min

D) 42 min

47 / 56

The rate of a reaction in general can be increased by all the following factors except:

NUMS 2015
Chemistry
Reaction Kinetics
Elimination Tool:

A) By increasing temperature

B) Using a suitable catalyst

C) By an increase in activation energy

D) By increasing conc. Of reactants

48 / 56

Rate = K [N2O5] has _____ of reaction.

NTS 2013
Chemistry
Reaction Kinetics
Elimination Tool:

A) First order

B) Pseudo first order

C) Second order

D) Third order

49 / 56

The unit of rate constant is same as that of rate of reaction in:

NUMS 2019 Reconduct
Chemistry
Reaction Kinetics
Elimination Tool:

A) First order reaction

B) Zero order reaction

C) Second order reaction

D) Third order reaction

50 / 56

The rate of reaction is equal to the specific rate constant, when:

Concentration of reactants collectively is unity

Concentration of each of the reactants is unity

Either a or b

None of these

51 / 56

Which of the following acids is used for Etching glass?

NTS 2011
Chemistry
Acids, Bases and Salts
Elimination Tool:

A) Hydrochloric Acid

B) Nitric Acid

C) Hydrofluoric Acid

D) Sulphuric Acid

52 / 56

In general Photochemical reactions are of order

PMC Sample 1
Chemistry
Reaction Kinetics
Elimination Tool:

A) 1

B) 3

C) 2

D) 0

53 / 56

The study of rates of chemical reactions and the factors that affect the rates of chemical reactions is known as:

PMC 2020
Chemistry
Reaction Kinetics
Elimination Tool:

A) Thermodynamics

B) Stoichiometry

C) Electrochemistry

D) Chemical Kinetics

54 / 56

Half life period of the first order reaction depends upon:

NUMS 2015
Chemistry
Reaction Kinetics
Elimination Tool:

A) Initial concentration

B) Temperature

C) Catalyst

D) All of above

55 / 56

The unit of the rate constant is the same as that of the rate of reaction in:

PMC 2020
Chemistry
Reaction Kinetics
Elimination Tool:

A) Zero order reaction

B) First order reaction

C) Second order reaction

D) Third order reaction

56 / 56

The rate of a gaseous reaction Is given by K [A] [B]. If the volume of the vessel containing these gases is reduced to 1/4th of the initial volume, the rate of reaction relative to the original rate would be:

NUMS 2016
Chemistry
Reaction Kinetics
Elimination Tool:

A) 16/1

B) 1/16

C) 4/1

D) 1/8

Your score is

The average score is 60%

Importance of Reaction Kinetics MCQs

A strong understanding of reaction kinetics helps students solve numerical problems related to reaction rates and rate constants. Exams often include MCQs on calculation of reaction orders, half-life of reactions, and the effect of concentration and temperature on reaction rates. Practicing chapter-wise MCQs improves accuracy, problem-solving skills, and confidence for competitive exams.

Effective Strategy for Free Preparation

For effective preparation, students should revise formulas and key concepts regularly, practice numerical problems step by step, and solve topic-wise MCQs consistently. Attempting free tests and past paper questions helps identify important concepts and repeated exam patterns. PLS Academy provides structured MCQs and free resources to support Chemistry Reaction Kinetics preparation and other Class 11 Chemistry chapters.

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