This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics – Quiz 24 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 24 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. As the temperature of the reaction increased, the rate of the reaction increases because A) Reactant molecule collide with greater energy. B) Reactant molecules collide with less frequently. C) Reactant molecules collide with less frequently and with greater energy. D) Activation energy is lowered. Show Answer Correct Answer: D) Activation energy is lowered. 2. The rate of a first order reaction depends on concentration. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 3. The rate of reaction 2x + y Products. Rate = K [x]$^{2 }$[y]. the order of the reaction is a) a. 3b) b. 2c) c. 1d) d. 0 A) A. B) B. C) C. D) D. Show Answer Correct Answer: A) A. 4. Hydrolysis of an ester follows ..... A) Zero Order Kinetics. B) Pseudo First Order Kinetics. C) First Order Kinetics. D) Half-life First order Kinetics. Show Answer Correct Answer: B) Pseudo First Order Kinetics. 5. Balance the following chemical reaction?Al + O$_{2}$ $\rightarrow$ Al$_{2}$O$_{3}$ A) 4Al + O$_{2}$ $\rightarrow$ Al$_{2}$O$_{3}$. B) Al+ 3O$_{2}$ $\rightarrow$ Al$_{2 .}$2(O)$_{3}$. C) 2Al + 1/2O$_{2}$ $\rightarrow$ Al$_{2}$O$_{3}$. D) 4Al + 3O$_{2}$ $\rightarrow$ 2Al$_{2}$O$_{3}$. Show Answer Correct Answer: D) 4Al + 3O$_{2}$ $\rightarrow$ 2Al$_{2}$O$_{3}$. 6. For the reaction 2A + B + 2C $\rightarrow$ D + 2E, the rate law is:rate =k[A]$^{2}$ [B]$^{1}$ [C]$^{1}$ Which of the following statements is correct:a) The reaction is second order in [A] b) The reaction is first order in [B] c) The reaction is second order in [C] d) The reaction is 3$^{rd}$ order overall A) A, C. B) A, B. C) C, D. D) A, B, D. Show Answer Correct Answer: B) A, B. 7. Based on the collision model, the atoms in the top of potential energy ''hill" are called A) Top of hill. B) Activation energy. C) Transition state. D) Steric factor. Show Answer Correct Answer: C) Transition state. 8. ..... are produced in one step and used up in a later step and ..... are present and unchanged in the reactants and the products A) Intermediates, catalysts. B) Catalysts, intermediates. C) All the above. D) None of the above. Show Answer Correct Answer: A) Intermediates, catalysts. 9. Which of the following are true when a catalyst is used in a chemical reaction? A) Enthalpy of reaction is lower. Activation energy for the reaction is lower. B) Enthalpy of reaction is same. Activation energy for the reaction is lower. C) Enthalpy of reaction is the lower.Activation energy for the reaction is same. D) Enthalpy of the reaction is same.Activation energy for the reaction is same. Show Answer Correct Answer: B) Enthalpy of reaction is same. Activation energy for the reaction is lower. 10. Half life of first order reaction is 20 min .what is rate constnt A) 3.47*10$^{-2}$ min-1. B) 5.62*10$^{-1 }$min-1. C) 8.47*10$^{-4}$ min-1. D) None of the above. Show Answer Correct Answer: A) 3.47*10$^{-2}$ min-1. 11. Identify the lab equipment used to measure the volume of a liquid accurately. A) Pipette. B) Graduated cylinder. C) Test tube. D) Beaker. Show Answer Correct Answer: A) Pipette. 12. Explain the concept of a rate law. A) A rate law describes the temperature dependence of a reaction. B) A rate law expresses the relationship between the rate of a chemical reaction and the concentration of its reactants. C) A rate law is a mathematical equation that predicts the products of a reaction. D) A rate law indicates the physical state of the reactants in a reaction. Show Answer Correct Answer: B) A rate law expresses the relationship between the rate of a chemical reaction and the concentration of its reactants. 13. A substance that increases the rate of a chemical reaction and may be recovered unchanged at the end of the reaction is a (n) A. Product.B. Catalyst.C. Activated complex.D. Reaction intermediate. A) A. B) B. C) C. D) D. Show Answer Correct Answer: B) B. 14. Activation energy is A) The amount of energy in a chemical reaction. B) The minimum amount of energy required for a chemical reaction to take place. C) The maximum amount of energy required for a chemical reaction to take place. D) None of the above. Show Answer Correct Answer: B) The minimum amount of energy required for a chemical reaction to take place. 15. The rate law for the chemical reaction, 2 NO$_{2}$CI $\rightarrow$ 2 NO$_{2}$ + Cl$_{2}$ is r = k [NO$_{2}$ Cl]. Which of the following is rate controlling step? A) 2 NO$_{2}$ + Cl$\rightarrow$ NO$_{2}$CI. B) NO$_{2}$ Cl + Cl $\rightarrow$ NO$_{2}$ + Cl$_{2}$. C) NO$_{2}$ Cl (s)$\rightarrow$NO$_{2}$ Cl(g). D) 2 NO$_{2}$ Cl$\rightarrow$ 2 NO$_{2}$ + Cl$_{2}$. Show Answer Correct Answer: C) NO$_{2}$ Cl (s)$\rightarrow$NO$_{2}$ Cl(g). 16. If k=0.02s-1 then order of reaction is A) Zero. B) Second. C) First. D) None of the above. Show Answer Correct Answer: C) First. 17. A reaction in which all reactants are in the same phase is called A) Elementary. B) Bimolecular. C) Homogeneous. D) Heterogeneous. Show Answer Correct Answer: C) Homogeneous. 18. The quantity of K in rate law expression A) Independent of concentration. B) Is called the Arrhenius constant. C) Is dimensionless. D) Is independent of temperature. Show Answer Correct Answer: A) Independent of concentration. 19. What is the effect of surface area on the rate of a reaction? A) The rate of a reaction is only affected by temperature, not surface area. B) The rate of a reaction increases with an increase in surface area. C) Surface area has no effect on the rate of a reaction. D) The rate of a reaction decreases with an increase in surface area. Show Answer Correct Answer: B) The rate of a reaction increases with an increase in surface area. 20. If my rate law is second order and I increase my concentration to 4, what would my new rate be? A) 4. B) 16. C) 2. D) 8. Show Answer Correct Answer: B) 16. 21. When energy is released, the reaction is described as ..... A) Endothermic. B) Exothermic. C) Zero order. D) First-order. Show Answer Correct Answer: B) Exothermic. 22. When initial concentration of reactant is doubled in a reaction, the half-life period is not affected. The order of reaction is A) Second. B) Zero. C) First. D) More than zero but less than first. Show Answer Correct Answer: C) First. 23. For a zero-order reaction, the concentration-time graph is: A) A straight line with a positive slope. B) A straight line with a negative slope. C) A curve with increasing slope. D) A curve with decreasing slope. Show Answer Correct Answer: B) A straight line with a negative slope. 24. Which of the following statements are in accordance with the Arrhenius equation? a) Rate of a reaction increases with increase in temperature. b) Rate of a reaction increases with decrease in activation energy. c) Rate constant decreases exponentially with increase in temperature. d) Rate of reaction decreases with decrease in activation energy. A) A and b. B) B and c. C) C and d. D) A, b, d. Show Answer Correct Answer: A) A and b. 25. . Which of the following factors only affects the rate of heterogeneous reactions? A. Nature of reactantsB. Presence of a catalystC. Temperature of reactantsD. Surface area of reactants A) A. B) B. C) C. D) D. Show Answer Correct Answer: D) D. ← 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