chemical kinetics mcqs

MCQs on Chemical Kinetics in Chemistry

Prepare for your Army, Navy, and PAF exams with our comprehensive collection of Chemical Kinetics MCQs. These questions are frequently asked in past papers and are essential for anyone aiming to become an officer, sailor, or civilian in Pakistan’s armed forces. Boost your chemistry knowledge and ensure success in your academic tests by mastering these key topics. Perfect for students and job seekers preparing for competitive exams.

Chemical Kinetics MCQ (Part-1)

  • A(n) ____________ reaction is a chemical reaction in which energy is absorbed from the environment. (endothermic)
  • ________ is a measure of the rate at which a reaction occurs. (reaction rate)
  • Catalysts increase the rate of a chemical reaction with ________ activation energy. (lowering)
  • ________ is the minimum amount of energy required for a reaction to occur. (activation energy)
  • Increasing the ____ of the reacting molecules usually leads to an increase in the reaction rate. (concentration)
  • In order of________, a reaction has a reaction rate that is directly proportional to the concentration of a single reactant. (first order)
  • A ________ reaction refers to a change in the concentration of a reactant or product over time. (rate)
  • The rate of a reaction can be determined by measuring the reactant or product over ________ time. (concentration)
  • In the reaction rate expression, the exponent of the concentration term for each reactant is called ________. (order of reaction)
  • The integral rate law for a ____ order reaction is linear when the natural logarithm of the reactant concentration is plotted as a function of time. (first order)
  • ________ is a graph showing the relationship between the rate of a reaction and the concentration of a reactant. (rate law)
  • Raising the temperature usually ________ the speed of the reaction. (increases)

Chemical Kinetics Notes PDF

Are you preparing for the Pakistan Army, Navy, or PAF chemistry tests? Our carefully curated Chemical Kinetics MCQs cover the most repeated questions from past papers. These MCQs are crucial for students aiming to pass their academic exams and for those aspiring to secure a position in the armed forces. Enhance your preparation and improve your chances of success by focusing on these high-frequency questions.

Chemical Kinetics MCQ(Part-2)

  • ________ reaction is a reaction in which reactants are converted into products in one step. (unimolecular)
  • ________ claims that the speed of a chemical reaction is directly proportional to the product of the concentrations of the reactants. (rate equation)
  • The presence of________ can provide an alternative reaction pathway with a lower activation energy, increasing the reaction rate. (catalyst)
  • Activation energy is the minimum amount of ________ required for a chemical reaction to occur. (energy)
  • Catalysts reduce the ________ of a chemical reaction, which increases the speed of the reaction. (activation energy)
  • The presence of a catalyst ensures a ________ reaction path with a lower activation energy. (alternative)
  • Raising the temperature usually ________ the activation energy of a reaction. (decreasing)
  • ________ theory explains how chemical reactions occur when reacting molecules collide. (collision)
  • ________ complex refers to intermediates formed during a chemical reaction that have a higher energy than the reactants or products. (transition)
  • The Arrhenius equation relates the rate constant (k) of a reaction to ________ energy, temperature and frequency factor. (activation)
  • A higher activation energy means a ________ reaction rate compared to a reaction with a lower activation energy. (slower)
  • The reaction rate increases exponentially by ________ due to the effect of activation energy. (increasing)
  • The activation energy can be determined experimentally by measuring the reaction rate with various ________. (temperatures)
  • The ____ factor in the Arrhenius equation reflects the frequency of successful collisions between the reacting molecules. (frequency)
  • For a given reaction, the catalyst provides an alternative ________ pathway that requires less energy to reach the transition state. (reaction)
  • In a catalyzed reaction, the activation energy of the ________ step is usually lower than in an uncatalyzed reaction. (Rate determining)
  • Increasing the ________ surface area of ​​the reacting molecules can increase the collision frequency and decrease the activation energy. (surface)
  • The activation energy barrier determines the ________ of a reaction and whether it proceeds at an appreciable rate. (feasibility)
  • Increasing the ________ of the reacting molecules usually results in an increase in the reaction rate. (concentration)
  • Temperature affects the rate of a reaction by affecting the number of ________ reacting molecules, which increases the frequency with which they collide. (kinetic energy)
  • Catalysts increase the rate of a chemical reaction by providing a ________ reaction pathway with a lower activation energy. (optional)

Chemical Kinetics Practice Problems MCQs

Ace your chemistry tests for the Pakistan Army, Navy, and PAF by practicing our top Chemical Kinetics MCQs. These questions are consistently featured in past papers and are vital for anyone preparing for officer, sailor, and civilian roles. Ideal for students needing to excel in their academics and job aspirants looking to achieve high scores in competitive exams. Get ready to succeed with these essential MCQs.

Chemical Kinetics MCQ(Part-3)

  • A ________ reaction refers to the change in concentration of a reactant or product over time. (rate)
  • Increasing the ________ surface area of reacting molecules can improve collision frequency and reaction rate. (surface area)
  • The number of reactant molecules ________ affects the rate of a reaction because smaller particles have more surface area and can react faster. (magnitude)
  • In order of ________, a reaction has a reaction rate that is directly proportional to the concentration of the individual reactant. (first time)
  • The ________ of the catalyst remains unchanged at the end of the reaction, allowing it to participate in multiple reaction cycles. (stoichiometry)
  • The presence of________ can provide an alternative reaction pathway with a lower activation energy, increasing the reaction rate. (catalyst)
  • The addition of ____ usually increases the rate of a reaction because it provides more energy for successful collisions between the reacting molecules. (temperature)
  • The ________ number of reacting molecules affects the rate of the reaction because molecules with higher kinetic energy are more likely to cross the activation energy barrier. (energy)
  • Increasing the ____ of a reactant can increase the reaction rate because it increases the probability of successful collisions. (concentration)
  • The ________ of a reaction can be affected by the presence of inhibitors that reduce the speed of the reaction by interfering with the reaction mechanism. (speed)
  • Changing the ________ of the reacting molecules can affect the speed of the reaction because the correct orientation is necessary for efficient collision and reaction. (molecular geometry)
  • ____ state theory explains how reacting molecules must have a minimum amount of energy called the activation energy to undergo a chemical reaction. (transition)
  • ________ theory explains how chemical reactions occur when reacting molecules collide. (collision)
  • According to collision theory, for a reaction to occur, the reacting molecules must collide with ________ energy and the correct ________. (sufficient, direction)
  • Increasing the ________ of reacting molecules usually results in an increase in collision frequency and reaction rate. (concentration)
  • The collision frequency is affected by the number of ________ reacting molecules because faster molecules collide more often. (kinetic energy)
  • ________ complex refers to intermediates formed during a chemical reaction that have a higher energy than the reactants or products. (movement)
  • Increasing ____ generally increases the kinetic energy of the molecules, resulting in increasingly energetic collisions. (temperature)
  • The ________ coefficient of the collision theory corresponds to the fraction of collisions with sufficient energy to overcome the activation energy barrier. (collision energy).

Basic Chemical Kinetics MCQ Objective Questions

Get ready for your Army, Navy, and PAF exams with our essential Chemical Kinetics MCQs. These questions have been repeatedly asked in past papers, making them critical for your preparation. Whether you are a student aiming to pass your chemistry exams or a candidate preparing for armed forces jobs, these MCQs will help you excel. Ensure you cover these key topics for a better chance at success.

Chemical Kinetics MCQ(Part-4)

  • The ________ state theory explains how reacting molecules must have a minimum amount of energy, called the activation energy, to undergo a chemical reaction. (transition)
  • Proper ________ between reacting molecules is essential for a successful collision and subsequent reaction. (orientation)
  • ________ theory provides a conceptual framework for understanding the factors affecting reaction rates and the importance of effective collisions. (collision)
  • Increasing the ________ surface area of ​​the reacting molecules can increase the collision frequency and reaction rate. (surface)
  • ________ state theory proposes that during a reaction, the reactant molecules form an unstable transition state before conversion to products. (activated)
  • ________ theory helps explain why not all collisions between reacting molecules lead to a chemical reaction. (collision)
  • The collision frequency can be increased by ________ system pressure because it leads to a higher concentration of reacting molecules. (increases)
  • The ________ factor of collision theory explains the fraction of collisions that have the correct orientation for a reaction to occur. (steric)
  • A ________ reaction refers to the rate at which reactants are converted to products. (rate)
  • The rate of a reaction is determined by measuring the concentration of reactant or product over ________ time. (change)
  • Increasing the ________ of the reacting molecules usually results in an increase in the reaction rate. (concentration)
  • ________ rate refers to the rate at which reactants disappear or the rate at which products appear. (original)
  • ________ state theory explains how reactive molecules must have a minimum amount of energy called the activation energy to undergo a chemical reaction. (transition)
  • The ________ rate law states that the rate of a chemical reaction is proportional to the product of the reactant concentrations, each raised to a power. (rate)
  • A reaction in the order ________ has a reaction rate that is directly proportional to the concentration of the individual reactants. (first time)
  • The equation ________ relates the reaction constant (k) to the activation energy, temperature and frequency factor. (Arrhenius)
  • At equilibrium, the ________ of forward and reverse reactions are equal, so the concentrations of reactants and products do not change. (rates)
  • The equilibrium constant (K) expresses the ratio of ____ concentrations in a balanced chemical reaction. (product/reactant)
  • Le Chatelier’s principle states that when a system in equilibrium is subjected to a stress, it will respond in such a way that it ________ the effect of the stress. (minimize)
  • An increase in reactant or product ____ can shift the equilibrium position to one with fewer moles of gas. (pressure)
  • Adding reactant or product to ________ can change the equilibrium position to one with more moles of gas. (volume)
  • ________ principle states that the equilibrium position depends on the temperature and can be changed by changing the temperature. (Van’t Hoff)
  • The value of the equilibrium constant (K) indicates the amount of ________ reactants for the products at equilibrium. (ratio)
  • ________ is a substance that increases the speed of a chemical reaction by lowering the activation energy. (catalyst)
  • Catalysts remain at the end of a ________ reaction and can participate in several reaction cycles. (unchanged)
  • The presence of a catalyst provides a ________ reaction pathway with a lower activation energy. (optional)
  • ________ catalysts are in the same phase as the reactants, while ________ catalysts are in a different phase. (Homogeneous, heterogeneous)
  • Enzymes are ________ catalysts that facilitate biochemical reactions in living organisms. (biological)
Chemical Kinetics mcqs of chemistry

MCQs of Chemical Kinetics

Preparing for chemistry exams to join the Pakistan Army, Navy, or PAF? Our high-frequency Chemical Kinetics MCQs, sourced from past papers, are exactly what you need. These questions are crucial for students looking to pass their academic tests and candidates aiming for officer, sailor, and civilian positions in the armed forces. Focus on these MCQs to enhance your preparation and achieve top results in your exams.

Chemical Kinetics MCQ(Part-5)

  • ________ reaction is a reaction in which the reactants and products are in the same phase and the catalyst is also in the same phase. (homogeneous)
  • ________ reaction is a reaction in which the reactants and products are in different phases and the catalyst is in a different phase. (heterogeneous)
  • ________ theory explains how catalysts increase the rate of a reaction by providing an alternative reaction pathway. (activation)
  • ________ a catalyst increases the rate of a reaction by providing a surface for reacting molecules to adsorb and interact with. (heterogeneous)
  • ________ complex is an intermediate form formed during a catalyzed reaction that has a higher energy than the reactants or products. (transition)
  • ________ catalysts can be poisoned or deactivated when impurities are deposited on their surface. (Heterogeneous)
  • In a catalyzed reaction, the activation energy of the ________ step is usually lower than in an uncatalyzed reaction. (rate determination)
  • The ____ of a catalyst is the number of moles of reactant that can be converted per unit of time. (action)
  • The ________ phenomenon describes a situation where the presence of a catalyst uniformly increases the rate of both forward and reverse reactions without affecting the equilibrium position. (catalyst)
  • The ________ constant of a catalyzed reaction remains the same as that of an uncatalyzed reaction because the catalyst does not affect the equilibrium position. (equilibrium)
  • Reaction ________ is the study of the rates at which chemical reactions occur and the factors that affect those rates. (kinetics)
  • The ________ order of reaction is determined by the sum of exponents in the rate equation. (overall)
  • The ________ law of reaction rate states that the rate of a chemical reaction is directly proportional to the concentration of the reactants. (rate)
  • A ________ reaction refers to the change in concentration of a reactant or product per unit time. (rate)
  • The ________ constant (k) in the rate equation represents the proportionality constant between the rate of the reaction and the concentrations of the reactants. (rate)
  • The ________ order of a reaction is determined by the reactant concentration exponent in the rate equation. (individual)
  • ________ state theory explains how reacting molecules must overcome an energy barrier called the activation energy to undergo a chemical reaction. (change)
  • ________ reaction, the rate of the forward reaction is equal to the rate of the reverse reaction, so the concentrations of reactants and products do not change. (equilibrium)
  • ________ phenomenon describes a situation where the presence of a catalyst uniformly increases the rate of both forward and reverse reactions without affecting the equilibrium position. (catalyst).
  • Industry ________ refers to vast chemical reactions carried out to produce various products on an industrial scale. (applications)
  • ________ process is an important industrial application used to produce ammonia from nitrogen and hydrogen gas. (Haber-Bosch)
  • The ____ process is an industrial application used to convert petroleum fractions into gasoline, diesel, and other fuels. (catalytic cracking)
  • The ____ process is an industrial application used to produce sulfuric acid from sulfur dioxide. (contact)
  • ________ process is an industrial application used to produce ethanol by fermenting sugars. (fermentation)
  • ________ process is an industrial application used to make the widely used plastic material polyethylene. (polymerization).

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