This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics – Quiz 19 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 19 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. In a chemistry experiment, Nora, William, and Olivia are observing a series of reactions. They are trying to determine which step is the rate determining one. What should they look for? A) The simplest reaction in the series. B) The slowest reaction in the series. C) The fastest reaction in the series. D) The main reaction involving the major reactant. Show Answer Correct Answer: B) The slowest reaction in the series. 2. In a first-order reaction, the rate of reaction is directly proportional to which of the following? A) The square of the concentration of the reactant. B) The concentration of the reactant. C) The inverse of the concentration of the reactant. D) The cube of the concentration of the reactant. Show Answer Correct Answer: B) The concentration of the reactant. 3. According to Bronsted-Bjerrum theory of effect of ionic strength on degradation rate, if the charges of the reacting species are the same, adding an electrolyte to a liquid formulation may cause stability problems. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 4. The rate of gaseous reaction remains unchanged when volume of the vessel is doubled. The order of the reaction is A) 0. B) 1. C) 2. D) 3. Show Answer Correct Answer: A) 0. 5. Which of the following statements concerning zero-order degradation is false? A) ITS CONCENTRATION REMAINS UNCHANGED WITH RESPECT TO TIME. B) Zero order reaction does not depend on concentration. C) Zero order rate constant units is mass/time. D) None of the above. Show Answer Correct Answer: A) ITS CONCENTRATION REMAINS UNCHANGED WITH RESPECT TO TIME. 6. In an experiment, the rate of reaction is measured at different temperatures. What is the most likely effect of increasing the temperature on the rate of reaction? A) The rate decreases. B) The rate remains the same. C) The rate increases. D) The rate becomes zero. Show Answer Correct Answer: C) The rate increases. 7. A reaction has the rate law:Rate = k [A][B].What is the overall order of reaction? A) 1st. B) 2nd. C) 3rd. D) 4th. Show Answer Correct Answer: B) 2nd. 8. The rate of a chemical reaction is NOT affected by which of the following: A) Temperature. B) Concentration. C) Particle size (surface area). D) All of these affect reaction rates. Show Answer Correct Answer: D) All of these affect reaction rates. 9. Radioactivity of a sample (z = 22) decreases 90% after 10 years. What will be the half-life of the sample? A) 5 years. B) 2 years. C) 3 years. D) 10 years. Show Answer Correct Answer: C) 3 years. 10. The reaction CHCl$_{3}$(g) + Cl$_{2}$(g)? CCl$_{4}$(g) + HCl(g) has the following rate law:Rate = k[CHCl$_{3}$][Cl$_{2}$]. If the concentration of CHCl$_{3}$ is increased by a factor of five while the concentration of Cl$_{2}$ is kept the same, the rate will a) Double. b) Increase by a factor of five. c) Triple. d) Decrease by a factor of one-fifth. A) A. B) B. C) C. D) D. Show Answer Correct Answer: B) B. 11. Which of the following is not a characteristic of a catalyst? A) It changes the equilibrium constant. B) It alters the reaction path. C) It increases the rate of reaction. D) It does not affect the Gibbs energy. Show Answer Correct Answer: A) It changes the equilibrium constant. 12. In a reaction, A + B $\rightarrow$ Product, rate is doubled when the concentration of B is doubled, and rate increases by a factor of 8 when the concentrations of both the reactants (Aand B) are doubled, rate law for the reaction can be written as A) Rate = k[A] [B]. B) Rate = k[A]$^{2}$[B]. C) Rate = k[A][B]$^{2}$. D) Rate = k[A]$^{2}$[B]$^{2}$. Show Answer Correct Answer: B) Rate = k[A]$^{2}$[B]. 13. When the rate of the reaction is equal to the rate constant, the order of the reaction is A) Zero order. B) First order. C) Second order. D) Third order. Show Answer Correct Answer: A) Zero order. 14. Define activation energy and its importance in kinetics. A) Activation energy is the total energy released during a reaction. B) Activation energy is the minimum energy needed for a reaction to occur, and it is important in kinetics as it affects the reaction rate. C) Activation energy has no effect on the speed of a reaction. D) Activation energy is the energy required to break chemical bonds only. Show Answer Correct Answer: B) Activation energy is the minimum energy needed for a reaction to occur, and it is important in kinetics as it affects the reaction rate. 15. Reaction rate is a change in ..... per unit time. A) State. B) Volume. C) Concentration. D) Mass. Show Answer Correct Answer: C) Concentration. 16. This type of kinetics is observed when the conc. or amount of the reactant is constant, either by excess initial concentration or by rapid replenishment of the reactant. A) Pseudo zero-order. B) Pseudo first-order. C) All the above. D) None of the above. Show Answer Correct Answer: A) Pseudo zero-order. 17. The rate law for a reaction between the substances A and B is given by Rate = k [A]$^{n}$ [B]$^{m}$ .On doubling the concentration of A and halving the concentration of B, the ratio of the new rate to the earlier rate of the reaction will be A) M+n. B) N-m. C) 2$^{n-m}$. D) 1/2$^{n+m}$. Show Answer Correct Answer: C) 2$^{n-m}$. 18. What is a zero-order reaction? A) A zero-order reaction is characterized by a variable reaction rate depending on temperature. B) A zero-order reaction has a constant reaction rate that does not depend on the concentration of reactants. C) A zero-order reaction requires a catalyst to proceed. D) A zero-order reaction has a reaction rate that increases with reactant concentration. Show Answer Correct Answer: B) A zero-order reaction has a constant reaction rate that does not depend on the concentration of reactants. 19. For a zero order reaction, the half life depends on the initial concentration [C$_{o}$] of the reactant as A) [C$_{o}$]. B) [C$_{o}$]$^{o}$. C) [C$_{o}$]$^{-1}$. D) [C$_{o}$]$^{1/2}$. Show Answer Correct Answer: B) [C$_{o}$]$^{o}$. 20. The expression that correlate rate of the reaction with concentration of the reactant is called A) Rate law. B) Rate expression. C) Rate order. D) Both 1 and 2. Show Answer Correct Answer: D) Both 1 and 2. 21. The overall order of a reaction is defined as: A) The sum of the stoichiometric coefficients. B) The sum of the exponents in the rate law expression. C) The maximum number of molecules involved in any elementary step. D) None of these. Show Answer Correct Answer: B) The sum of the exponents in the rate law expression. 22. For the elementary step of a chemical reaction:A + H$_{2}$O $\rightarrow$ Brate = [A]$^{1}$What is the (i) Molecularity and (ii) Order of the reaction. A) 1, 1. B) 1, 2. C) 2, 1. D) 2, 2. Show Answer Correct Answer: C) 2, 1. 23. If 'a' is the initial concentration of the reactant, the half life period of the n$^{th}$ order reaction is proportional to A) A$^{n-1}$. B) A$^{n}$. C) A$^{1-n}$. D) A$^{n+1}$. Show Answer Correct Answer: C) A$^{1-n}$. 24. What is the rate equation of following chemical reaction?2NaOH + H$_{2}$SO$_{4}$ $\rightarrow$ Na$_{2}$SO$_{4}$ + 2H$_{2}$O A) Rate = k.[NaOH]$^{2}$.[H$_{2}$SO$_{4}$]. B) Rate = k.[NaOH].[H$_{2}$SO$_{4}$]. C) Rate = k.[NaOH]$^{2}$. D) Rate = k.[NaOH]$^{2}$.[H$_{2}$SO$_{4}$]$^{2}$. Show Answer Correct Answer: A) Rate = k.[NaOH]$^{2}$.[H$_{2}$SO$_{4}$]. 25. What is the relationship between rate of reaction and temperature? A) No relationship. B) Directly proportional. C) Inversely proportional. D) Jointly proportional. Show Answer Correct Answer: B) Directly proportional. ← PreviousNext →Related QuizzesClass 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 1Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 2Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 3Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 4Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 5Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 6Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 7Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 8Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 9Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books