Free Reaction Kinetics MCQs with Answers
573 Reaction Kinetics MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Reaction kinetics relates reaction rate to concentration, temperature, surface area and catalysts. Questions cover rate laws, reaction order, rate constants, activation energy and the activated complex, including how a catalyst lowers the activation energy without changing the overall energy change or equilibrium position.
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573 questions · page 17 of 29
- A. It speeds up a chemical reaction
- B. It is used in smaller amount
- C. Does not change the equilibrium constant of a reaction
- D. All are correct.
Explanation: Option D is correct.1.Speeds up a chemical reaction. A catalyst lowers the activation energy of a reaction, which allows the reaction to…
Correct answer: All are correct.- A. Autocatalysis
- B. Enzyme Catalysis
- C. Negative catalysis
- D. Poisoning of a catalyst
Explanation: Option A is correct.In some of the reactions, a product formed acts as a catalyst, this phenomenon is called autocatalysis.
Correct answer: Autocatalysis- A. It is highly specific in action
- B. Its activity is increased by the presence of activator
- C. It shows maximum rate of reaction at minimum temperature
- D. Its catalytic activity is inhibited by a poison
Explanation: Option C is correct.The incorrect statement about enzyme catalysis is: It shows maximum rate of reaction at minimum temperature.
Correct answer: It shows maximum rate of reaction at minimum temperature- A. 2 x 10^-3 s-1
- B. 3 x 10^-3 s-1
- C. 4 x 10^-3 s-1
- D. 5 x 10^-3 s-1
Explanation: Option D is correct.The rate constant for a first-order reaction is the proportionality constant between the rate of reaction and the…
Correct answer: 5 x 10^-3 s-1- A. H2O2 → H2O + O2
- B. 2N2O5 → 4NO2 + O2
- C. 2O3 → 3O2
- D. Both A and B
Explanation: Option Ais correct.The decomposition of hydrogen peroxide, H2O2 → H2O + O2, is an example of a first order reaction.
Correct answer: H2O2 → H2O + O2- A. Activation energy
- B. Properly oriented
- C. Activation energy and proper orientation
- D. Concentrated
Explanation: Both are necessary for the reaction to occur. Activation energy to initiate the reaction and proper orientation for successful collisions.
Correct answer: Activation energy and proper orientation327. All of the following statements are correct for rate of reaction and specific rate constant EXCEPT:
- A. A
- B. B
- C. C
- D. D
Explanation: C is false. Rate unit is moldm-3 s-1 and rate constant's units depend upon the order of reaction .
Correct answer: C- A. A
- B. B
- C. C
- D. D
Explanation: D is incorrect. Order of reaction can have a small integer, half integer and even a negative value.Also, Molecularity can never be zero…
Correct answer: D- A. Homogeneous catalysis
- B. Heterogeneous catalysis
- C. Biological catalysis
- D. Gas catalysis
Explanation: The given reaction 2SO2(g) + O2(g) -> 2SO3(g) with NO2(g) as a catalyst represents a type of catalysis known as Homogeneous catalysis.In…
Correct answer: Homogeneous catalysis- A. Lower than the energy of reactants and higher than the energy of products
- B. Lower than the energy of products and higher than the energy of reactants
- C. Lower than the energy of both the reactants and products
- D. Higher than the energy of both the reactants and products
Explanation: D is correct. The energy given to initiate areaction or to form an activated complex is always higher than both reactants and products.
Correct answer: Higher than the energy of both the reactants and products- A. Catalyst
- B. Reactant
- C. Product
- D. Activated complex
Explanation: Catalyst increases the speed of reaction by decreasing the activation energy and are reformed at the end of the reaction , and hence we…
Correct answer: Catalyst- A. Rate determining step
- B. Rate limiting step
- C. Rate controlling step
- D. Both A and B
Explanation: The slowest step in a step-by-step reaction is called the "rate-determining step" or "rate-limiting step."In a multi-step chemical…
Correct answer: Both A and B- A. Concentration of product
- B. Temperature
- C. Catalyst
- D. Activation energy
Explanation: The correct option is "Concentration of product" because the concentration of the product does not directly affect the rate of reaction.
Correct answer: Concentration of product- A. It's in excess
- B. A solvent
- C. Solute
- D. Both A and B
Explanation: The rate equation for the hydrolysis of tertiary butyl bromide is independent of the concentration of water as a reactant because water is…
Correct answer: Both A and B- A. The concentration of the reaction increases
- B. The activation energy for reaction remains same
- C. Collision frequency increases
- D. All of these
Explanation: When we increase the temperature, the rate of reaction typically increases because the concentration of reactants increases and the…
Correct answer: All of these- A. Zero
- B. Two
- C. Three
- D. One
Explanation: Oxidation of nitric oxide with ozone has been shown to be first order with respect to NO and first order with respect to O,.
Correct answer: One- A. Rate constant
- B. Reaction speed
- C. Rate of a reaction
- D. All of these
Explanation: Rate of reaction is typically expressed as the change in the concentration of reactants or products per unit time and is influenced by…
Correct answer: Rate of a reaction- A. Change in temperature
- B. Change in pressure
- C. Change in Volume
- D. Change in concentration
Explanation: The rate of a chemical reaction is typically determined by measuring the change in concentration of reactants or products over…
Correct answer: Change in concentration- A. Disappearance of reactants
- B. Formation of products
- C. A given time
- D. All of these
Explanation: When you're looking at the rate of a reaction in terms of reactants, you typically express it as a decrease in the concentration of…
Correct answer: Disappearance of reactants- A. Reactant ions concentration
- B. Temperature of mixture
- C. Adding an impurity
- D. By catalyst
Explanation: The conductivity of a solution is directly influenced by the concentration of ions present in the solution.
Correct answer: Reactant ions concentration