This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics – Quiz 12 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 12 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The unit of rate constant for the second order reaction will be ..... A) S$^{-1}$. B) L mol$^{-1}$ s$^{-1}$. C) Mol$^{0.5}$ L$^{-0.5}$ s$^{-1}$. D) Mol L$^{-1}$ s$^{-1}$. Show Answer Correct Answer: B) L mol$^{-1}$ s$^{-1}$. 2. Which of the following statements about catalysts is true:a. catalysts do not appear in the balanced equation b. catalysts reduce the activation energy for a reaction c. biological catalysts are called enzymes d. catalysts do not alter the mechanism of the reaction and never appear in the rate law A) A, B. B) B, C, D. C) A, B, C. D) A, B, D. Show Answer Correct Answer: C) A, B, C. 3. A+B $\rightarrow$C+D $\Delta$H =-202kj/molHow can above reaction be classified in terms of energy exchange during chemical change? A) Combination reaction. B) Endothermic reaction. C) Transthermal reaction. D) Exothermic reaction. Show Answer Correct Answer: D) Exothermic reaction. 4. Which type of catalyst is used in the Haber process for ammonia synthesis? A) Pt. B) Fe. C) Ni. D) Cu. Show Answer Correct Answer: B) Fe. 5. A type of system which do not allow exchange of energy and matter with its surroundings A) Open. B) Closed. C) Isolated. D) Universal. Show Answer Correct Answer: C) Isolated. 6. What is meant by a reaction being first order with respect to a reactant? A) The rate of the reaction is directly proportional to the concentration of that reactant. B) The rate of the reaction is independent of the concentration of that reactant. C) The rate of the reaction decreases as the concentration of that reactant increases. D) The rate of the reaction is inversely proportional to the concentration of that reactant. Show Answer Correct Answer: A) The rate of the reaction is directly proportional to the concentration of that reactant. 7. Will the rate constant of a reaction depends upon T if the activation energy of the reaction is zero? A) Rate constant become independent upon the temperature if Ea is zero. B) Rate constant become dependent upon the temperature if Ea is zero. C) Rate constant become zero. D) Can't say. Show Answer Correct Answer: A) Rate constant become independent upon the temperature if Ea is zero. 8. In a reaction mechanism, if the first step is slow and the second step is fast, what can be inferred about the overall rate law? A) It depends on both steps. B) It depends only on the fast step. C) It depends only on the slow step. D) It cannot be determined. Show Answer Correct Answer: B) It depends only on the fast step. 9. Given 3A + B $\rightarrow$ 2CWhich statement is TRUE A) Concentration A will be increase and concentration B will be decrease after reaction. B) Concentration A will be increase and concentration C will be decrease after reaction. C) Concentration B will be decrease and concentration C will be increase after reaction. D) Concentration B will be decrease and concentration A will be increase after reaction. Show Answer Correct Answer: C) Concentration B will be decrease and concentration C will be increase after reaction. 10. What is the term for the speed of a reaction? A) Reaction constant. B) Reaction rate. C) Reaction order. D) Reaction mechanism. Show Answer Correct Answer: B) Reaction rate. 11. Usually lowering the temperature will slow down a reaction. A) False. B) True. C) All the above. D) None of the above. Show Answer Correct Answer: B) True. 12. The rate law of the reaction 2N$_{2}$O$_{5}$ $\rightarrow$ 2NO$_{2}$ + O$_{2}$ is A) R = k[N$_{2}$O$_{5}$ ]. B) R = k[N$_{2}$O$_{5}$ ]$^{2}$. C) R = k[N$_{2}$O$_{5}$ ]0. D) R = k[NO$_{2}$]$^{4 }$[O$_{2}$]. Show Answer Correct Answer: B) R = k[N$_{2}$O$_{5}$ ]$^{2}$. 13. What is the point group of water A) C2v. B) C3V. C) C4V. D) C5V. Show Answer Correct Answer: A) C2v. 14. Unit for rate constant is one of the striking differences between a zero and first order process? A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 15. The time taken for 10% completion of a first order reaction is 20 mins .Then for 19% completion, the reaction will take A) 50 mins. B) 30 mins. C) 40 mins. D) 60 mins. Show Answer Correct Answer: C) 40 mins. 16. For which reactions the rate and rate constant are identical? A) Zero order reaction. B) First order reaction. C) Pseudo first order reaction. D) Third order reaction. Show Answer Correct Answer: A) Zero order reaction. 17. For the reaction mechanism:Step 1:A+B$\rightarrow$C (slow)Step 2:C$\rightarrow$D (fast)The rate law is: A) Rate =k[A][B]. B) Rate =k[C]. C) Rate =k[A]$^{2}$[B]. D) Rate =k[D]. Show Answer Correct Answer: A) Rate =k[A][B]. 18. Which of the following is the example of pseudo first order reactions? A) Decomposition of ammonium nitrite. B) Conversion of N-chloroacetanilide into p-chloroacetanilide. C) Hydrolysis of ethylacetate. D) Decomposition of hydrogen peroxide. Show Answer Correct Answer: C) Hydrolysis of ethylacetate. 19. What is the difference between zero-order and first-order reactions? A) Zero-order reactions have a rate that increases with time; first-order reactions have a constant rate. B) Zero-order reactions are faster than first-order reactions at all concentrations. C) Zero-order reactions have a constant rate; first-order reactions have a rate proportional to reactant concentration. D) Zero-order reactions depend on temperature; first-order reactions do not. Show Answer Correct Answer: C) Zero-order reactions have a constant rate; first-order reactions have a rate proportional to reactant concentration. 20. What is the effect of concentration on the rate of a reaction? A) Increasing concentration has no effect on the rate of a reaction. B) Decreasing concentration typically increases the rate of a reaction. C) Concentration only affects the temperature of the reaction. D) Increasing concentration typically increases the rate of a reaction. Show Answer Correct Answer: D) Increasing concentration typically increases the rate of a reaction. 21. A chemical reaction that requires energy is a A) Exothermic reaction. B) Endothermic reaction. C) Over reaction. D) None of the above. Show Answer Correct Answer: B) Endothermic reaction. 22. A first order reaction takes 40 min for 30% decomposition. t$_{1/2}$ will be A) 77.7 min. B) 52.5 min. C) 46.2 min. D) 22.7 min. Show Answer Correct Answer: A) 77.7 min. 23. During a chemistry experiment, Scarlett, Charlotte, and Aiden are trying to understand the rate law expression. They are discussing the quantity of K in the expression. What is the correct statement about K? A) It is independent of the concentration of the reactants. B) It is called the Arrhenius constant. C) It is dimensionless. D) It is independent of temperature. Show Answer Correct Answer: A) It is independent of the concentration of the reactants. 24. Acids yield hydrogen ions while bases yield hydroxyl ions. The aforementioned statement agrees with; A) Arrhenius theory. B) Bronsted-Lowry theory. C) Lewis theory. D) None of the choices. Show Answer Correct Answer: A) Arrhenius theory. 25. A reaction is found to be second order with respect to carbon monoxide. If the concentration of carbon monoxide is doubled, the rate of reaction ..... A) Doubles. B) Remains unchanged. C) Increases by a factor of 4. D) Is reduced by a factor of 2. Show Answer Correct Answer: C) Increases by a factor of 4. ← 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