This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Chemistry Part I > Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics – Quiz 10 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 10 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Collision theory is satisfactory for: A) Bimolecular elementary reaction. B) First order reactions. C) Any order reactions. D) Zero order reactions. Show Answer Correct Answer: A) Bimolecular elementary reaction. 2. Explain the concept of half-life in chemical kinetics. A) Half-life is the time required for a product to form in a reaction. B) Half-life refers to the total time a reaction takes to complete. C) Half-life is the time taken for a reactant to double its concentration. D) Half-life is the time taken for the concentration of a reactant to reduce to half its initial value. Show Answer Correct Answer: D) Half-life is the time taken for the concentration of a reactant to reduce to half its initial value. 3. The rate constant is doubles on the increasing temperature from 310K to 350K. What is the activation energy (in kJ mol-1) for this reaction? A) 25.8. B) 29.2. C) 12.3. D) 15.6. Show Answer Correct Answer: D) 15.6. 4. If the half-life of a first-order reaction is 20 min, the time required for 87.5% decomposition is: A) 80 min. B) 20 min. C) 40 min. D) 60 min. Show Answer Correct Answer: D) 60 min. 5. Samuel is observing how quickly a tablet dissolves in water. What aspect of the reaction is Samuel studying? A) The balance of chemical equations. B) Whether a reaction will occur. C) The rate at which a reaction occurs. D) The energy released by a reaction. Show Answer Correct Answer: C) The rate at which a reaction occurs. 6. Which of the following expression is the accurate depiction of the rate of degradation of hydrocortisone alcohol, P1? hydrocortisone hemisuccinate D $\rightarrow$ hydrocortisone alcohol P1 $\rightarrow$ 17-dihydroxyacetone products P2 A) -d[P1]/dt = K2[P2]-K1[P1]. B) -d[P1]/dt = K2[P1]-K1[D]. C) D[P1]/dt = K2[P1] + K1[D]. D) -d[P1]/dt = K1[D]-K2[P1]. Show Answer Correct Answer: B) -d[P1]/dt = K2[P1]-K1[D]. 7. What is the relationship between reaction rate and the order of a reaction? A) Reaction rate is not affected by the order of a reaction. B) Reaction rate is proportional to the square of the order of a reaction. C) Reaction rate is inversely proportional to the order of a reaction. D) Reaction rate is directly proportional to the order of a reaction. Show Answer Correct Answer: D) Reaction rate is directly proportional to the order of a reaction. 8. Activation energy of a chemical reaction can be determined by ..... A) Determining the rate constant at standard temperature. B) Determining the rate constants at two temperatures. C) Determining probability of collision. D) Using catalyst. Show Answer Correct Answer: B) Determining the rate constants at two temperatures. 9. Which is equal to the slope of a line drawn tangentto the concentration vs time curve at that time A) Fast rate. B) Slow rate. C) Instantaneous rate. D) Average rate. Show Answer Correct Answer: C) Instantaneous rate. 10. Write the rate law and order for the following reaction:AB$_{2}$ + C$_{2}$ $\rightarrow$ AB$_{2}$C + C (slow)AB$_{2}$ + C $\rightarrow$ AB$_{2}$C (Fast) A) R= K [AB$_{2}$]$^{2 }$[C$_{2}$]order = 2. B) R= K [AB$_{2}$] [C$_{2}$]order = 2. C) R= K [AB$_{2}$] [C$_{2}$]order = 3. D) R= K [AB$_{2}$]order = 2. Show Answer Correct Answer: B) R= K [AB$_{2}$] [C$_{2}$]order = 2. 11. A first order reaction has a half-life length of 10 minutes. In 100 minutes, what proportion of the response will be completed? A) 99.9%. B) 25%. C) 75%. D) 50%. Show Answer Correct Answer: A) 99.9%. 12. Which of the following factors affect the rate of a reaction according to collision theory?I. The frequency of the collisions between reactant particles.II. The orientation of the particles when they collide.III. The number of reactant particles with E greater than or equal to Ea. A) I and II only. B) I and III only. C) II and III only. D) L, II and III only. Show Answer Correct Answer: D) L, II and III only. 13. The activation energy for the forward reaction is Ea, and the enthalpy change ($\Delta$H) is-40 kJ/mol. What is the activation energy for the backward reaction? A) 40 kJ/mol. B) Ea-40 kJ/mol. C) Ea. D) Ea + 40 kJ/mol. Show Answer Correct Answer: D) Ea + 40 kJ/mol. 14. Which statement will be increase the rate of reaction A) Temperature must be lowered. B) Dilute concentration. C) Lower pressure. D) Smaller size particles. Show Answer Correct Answer: D) Smaller size particles. 15. What is the slope of the graph of concentration vs. Time for 0 order reaction A) -k. B) K/2.023. C) K. D) 1/k. Show Answer Correct Answer: A) -k. 16. Consider the following rate law:Rate = k[A]$^{n}$[B]$^{m}$How are the exponents n and m determined? A) By educated guess. B) By using balanced chemical equation. C) By using the subscripts for the formulas. D) By experiment. Show Answer Correct Answer: D) By experiment. 17. The number of molecules of the reactants taking part in a single step of the reaction is indicative of A) Fast step of the mechanism of a reaction. B) Molecularity of a reaction. C) Order of a reaction. D) Half-life of the reaction. Show Answer Correct Answer: B) Molecularity of a reaction. 18. What is the unit for rate constant, K if rate law:Rate = k [A] A) M$^{-2 }$s$^{-1}$. B) M$^{-1 }$s$^{-1}$. C) S$^{-1}$. D) M s$^{-1}$. Show Answer Correct Answer: C) S$^{-1}$. 19. The slope of a ln k vs. 1/T plot is: A) + Ea/R. B) -Ea/R. C) Ln Ea. D) Ln A. Show Answer Correct Answer: B) -Ea/R. 20. 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. 21. 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. 22. 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) B. B) A. C) D. D) C. Show Answer Correct Answer: B) A. 23. Hydrolysis of an ester follows ..... A) Pseudo First Order Kinetics. B) First Order Kinetics. C) Half-life First order Kinetics. D) Zero Order Kinetics. Show Answer Correct Answer: A) Pseudo First Order Kinetics. 24. Balance the following chemical reaction?Al + O$_{2}$ $\rightarrow$ Al$_{2}$O$_{3}$ A) 2Al + 1/2O$_{2}$ $\rightarrow$ Al$_{2}$O$_{3}$. B) 4Al + 3O$_{2}$ $\rightarrow$ 2Al$_{2}$O$_{3}$. C) 4Al + O$_{2}$ $\rightarrow$ Al$_{2}$O$_{3}$. D) Al+ 3O$_{2}$ $\rightarrow$ Al$_{2 .}$2(O)$_{3}$. Show Answer Correct Answer: B) 4Al + 3O$_{2}$ $\rightarrow$ 2Al$_{2}$O$_{3}$. 25. 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) C, D. C) A, B, D. D) A, B. Show Answer Correct Answer: D) A, B. 26. Based on the collision model, the atoms in the top of potential energy ''hill" are called A) Top of hill. B) Transition state. C) Steric factor. D) Activation energy. Show Answer Correct Answer: B) Transition state. 27. ..... 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. 28. Which of the following are true when a catalyst is used in a chemical reaction? A) Enthalpy of reaction is same. Activation energy for the reaction is lower. B) Enthalpy of reaction is the lower.Activation energy for the reaction is same. C) Enthalpy of reaction is lower. Activation energy for the reaction is lower. D) Enthalpy of the reaction is same.Activation energy for the reaction is same. Show Answer Correct Answer: A) Enthalpy of reaction is same. Activation energy for the reaction is lower. 29. 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. 30. Identify the lab equipment used to measure the volume of a liquid accurately. A) Test tube. B) Pipette. C) Graduated cylinder. D) Beaker. Show Answer Correct Answer: B) Pipette. 31. 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. 32. 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) C. B) A. C) B. D) D. Show Answer Correct Answer: C) B. 33. 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. 34. 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) 2 NO$_{2}$ Cl$\rightarrow$ 2 NO$_{2}$ + Cl$_{2}$. C) NO$_{2}$ Cl (s)$\rightarrow$NO$_{2}$ Cl(g). D) NO$_{2}$ Cl + Cl $\rightarrow$ NO$_{2}$ + Cl$_{2}$. Show Answer Correct Answer: C) NO$_{2}$ Cl (s)$\rightarrow$NO$_{2}$ Cl(g). 35. 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. 36. A reaction in which all reactants are in the same phase is called A) Heterogeneous. B) Homogeneous. C) Elementary. D) Bimolecular. Show Answer Correct Answer: B) Homogeneous. 37. 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. 38. What is the effect of surface area on the rate of a reaction? A) Surface area has no effect on the rate of a reaction. B) The rate of a reaction increases with an increase in surface area. C) The rate of a reaction is only affected by temperature, not surface area. 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. 39. If my rate law is second order and I increase my concentration to 4, what would my new rate be? A) 4. B) 8. C) 2. D) 16. Show Answer Correct Answer: D) 16. 40. When energy is released, the reaction is described as ..... A) Endothermic. B) First-order. C) Zero order. D) Exothermic. Show Answer Correct Answer: D) Exothermic. 41. 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) More than zero but less than first. C) First. D) Zero. Show Answer Correct Answer: C) First. 42. For a zero-order reaction, the concentration-time graph is: A) A curve with decreasing slope. B) A curve with increasing slope. C) A straight line with a positive slope. D) A straight line with a negative slope. Show Answer Correct Answer: D) A straight line with a negative slope. 43. 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. 44. . 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) C. C) B. D) D. Show Answer Correct Answer: D) D. 45. Which of the following increase the reaction rate? A) An inhibitor. B) Increased concentration. C) Lower temperature. D) Less surface area. Show Answer Correct Answer: B) Increased concentration. 46. Example of zero order reaction A) Decomposition of ammonia on iron surface. B) Decomposition of HI on iron surface. C) Decomposition of ammonia on platinum surface. D) All of these. Show Answer Correct Answer: C) Decomposition of ammonia on platinum surface. 47. Assertion:Order and molecularity are same. Reason:Order is determined experimentally and molecularity is the sum of the stoichiometric coefficient of rate determining elementary step. A) Both assertion and reason are correct and the reason is correct explanation of assertion. B) Both assertion and reason are correct but reason does not explain assertion. C) Assertion is correct but reason is incorrect. D) Assertion is incorrect but reason is correct. Show Answer Correct Answer: D) Assertion is incorrect but reason is correct. 48. For the reaction, A(g) + B(g) $\rightarrow$ A) 9. B) 4. C) 6. D) 2. Show Answer Correct Answer: A) 9. 49. Which statement best defines rate of reaction? A) The speed at which the reaction occurs. B) The time taken for the reaction to reach completion. C) The increase in concentration of a reactant or product over time. D) The change in concentration of a reactant or product over time. Show Answer Correct Answer: D) The change in concentration of a reactant or product over time. 50. What is the average rate of a reaction defined as? A) Change in pressure over time. B) Change in volume over time. C) Change in temperature over time. D) Change in concentration over time. Show Answer Correct Answer: D) Change in concentration over time. 51. Hydrogen bonding is a special type of intermolecular attraction between the hydrogen atom in a polar bond. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 52. In a first-order reaction, how does the rate change if the concentration is doubled? A) Rate doubles. B) Rate remains the same. C) Rate quadruples. D) Rate decreases. Show Answer Correct Answer: A) Rate doubles. 53. Jackson is trying to speed up a chemical reaction in his kitchen experiment. Which of the following actions will help him increase the rate of the reaction? A) Adding a catalyst. B) Diluting the reactants. C) Reducing surface area. D) Decreasing temperature. Show Answer Correct Answer: A) Adding a catalyst. 54. The minimum amount of energy required to start a chemical reaction is called A) Enthalpy. B) Activation energy. C) Entropy. D) Free energy. Show Answer Correct Answer: B) Activation energy. 55. A first order reaction is 75% completed in 40 min calcultes t1/2 A) 20 min. B) 19 min. C) 22 min. D) None of the above. Show Answer Correct Answer: A) 20 min. 56. A catalyst is a substance which ..... the rate of a reaction A) Help in calculating. B) Increases. C) Decreases. D) Does not affect. Show Answer Correct Answer: B) Increases. 57. The rate of a reaction depends on: A) Temperature. B) Reactant concentration. C) Presence of catalyst. D) All of the above. Show Answer Correct Answer: D) All of the above. 58. Activation energy of a chemical reaction can be determined by ..... a) Determining the rate constant at standard temperature. b) Determining the rate constants at two temperatures. c) Determining probability of collision. d) Using catalyst A) A. B) B. C) D. D) C. Show Answer Correct Answer: B) B. 59. A reaction is 50% complete in 2 hrs afd 75% complete in 4hrs. what is the order of the reaction? A) Second order. B) Third order. C) Zero order. D) First order. Show Answer Correct Answer: D) First order. 60. Which of the following is pseudo first order reaction? A) Hydrolysis of Sucrose. B) Decomposition of ammonia on metal surface. C) Decomposition of N2O5. D) Radioactive decay. Show Answer Correct Answer: A) Hydrolysis of Sucrose. ← PreviousNext →Related QuizzesScience QuizzesClass 12 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 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books