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 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 3 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Catalyst get used up in the reaction A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 2. Which S.L graph paper will be appropriate if you wish to plot solubility against reciprocal of absolute temperature for 11mg/ml, 39mg, ml, and 121 mg/ml at 25, 45, and 55 degrees Celsius respectively? A) Three cycles. B) Log paper. C) Two cycles. D) One cycle. Show Answer Correct Answer: C) Two cycles. 3. What is the function of catalyst in the reaction? A) Provides an alternative pathway which has a lower activation energy. B) Supply energy to the chemical reaction. C) The compulsory substance to complete chemical reaction. D) Decoration in the chemical reaction. Show Answer Correct Answer: A) Provides an alternative pathway which has a lower activation energy. 4. Which of the following statements about the Arrhenius equation is correct? A) The activation energy has no effect on the rate constant. B) The rate constant decreases with increasing temperature. C) The rate constant is independent of temperature. D) The rate constant increases with decreasing activation energy. Show Answer Correct Answer: D) The rate constant increases with decreasing activation energy. 5. A type of system which allows exchange of energy but not matter with its surroundings A) Closed. B) Isolated. C) Universal. D) Open. Show Answer Correct Answer: A) Closed. 6. The value of change of enthalpy is ..... if the heat flow from the system to the surroundings A) Positive. B) Negative. C) Unchanged. D) None of the above. Show Answer Correct Answer: B) Negative. 7. In the given reaction A $\rightarrow$ B. When conc. of A is changed from 0.1 M to1M. then rate of reaction increases by a factor of 100. what is the order of the reaction with respect to A A) 3. B) 10. C) 2. D) 1. Show Answer Correct Answer: C) 2. 8. Covid 19 is due to A) Virus. B) Bacteria. C) Fungi. D) None. Show Answer Correct Answer: A) Virus. 9. What is the half life of a first order reaction if its rate constant 2 minutes-1 A) 0.53 minutes. B) 0.35 minutes. C) 5.3 minutes. D) 3.5 mintunes. Show Answer Correct Answer: D) 3.5 mintunes. 10. The ..... the surface area of the reactants, the faster the reaction rate. A) Larger. B) Smaller. C) All the above. D) None of the above. Show Answer Correct Answer: A) Larger. 11. The first order reaction is 50% completed in 69.3 minutes, then time required for 99.9% completion of this reaction is A) 693 minute. B) 6.93 minute. C) 6930 minute. D) 0.693 minute. Show Answer Correct Answer: A) 693 minute. 12. A chemical applied to fruit to stop it from rotting is an example of a(n) A) Catalyst. B) Emulsifier. C) Inhibitor. D) Transition state. Show Answer Correct Answer: C) Inhibitor. 13. A first order reaction is 50% complete in 25 min Calculate the time required for completeion of 80% of reaction A) 58.06. B) 57.06. C) 59.06. D) None of the above. Show Answer Correct Answer: B) 57.06. 14. Aiden, David, and Scarlett are working on a school project about chemical reactions. They are trying to determine the rate law for a particular reaction. How should they go about this? A) By conducting an experiment. B) By examining the coefficients in the balanced chemical equation of the reaction. C) By deriving it from the equilibrium constant of the reaction. D) By calculating it from the rates of forward and reverse reactions of the system in equilibrium. Show Answer Correct Answer: A) By conducting an experiment. 15. Units of rate constant for first order reaction is A) Per second. B) Per litre. C) Per mol. D) None of the above. Show Answer Correct Answer: A) Per second. 16. What does kinetics mainly study? A) Reaction rates. B) How much products are produced. C) Pressure of (g) mixtures. D) Concentration of (aq) mixtures. Show Answer Correct Answer: A) Reaction rates. 17. The unit of rate and rate constant are same for ..... order reaction A) One. B) Three. C) Two. D) Zero. Show Answer Correct Answer: D) Zero. 18. The rate equation for the dimerization of NO2 is $\frac{-\Delta\left[NO_2\right]}{\Delta t}=k\left[NO_2\right]2$ A) Adding more NO$_{2}$ to the reaction mixture. B) Adding an inert gases to the mixture. C) Decreasing the volume of the reaction vessel. D) Increasing the temperature of the reaction vessel. Show Answer Correct Answer: D) Increasing the temperature of the reaction vessel. 19. The order of reaction is based from non-experimental data A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 20. What is the meaning of the rate of reaction? A) Decrease in amount of product against time. B) Decrease in amount of product. C) Increase in amount of products against time. D) Increase in amount of reactants against time. Show Answer Correct Answer: C) Increase in amount of products against time. 21. What is the Value of rate constant at extremly high temperature i.e infinte. A) K=A. B) K=o. C) K becomes infinte. D) None of these. Show Answer Correct Answer: A) K=A. 22. If we plot log k Vs 1/T, by Arrhenius equation, the slope is A) +Ea/2.303R. B) +Ea/R. C) -Ea/R. D) -Ea/2.303R. Show Answer Correct Answer: D) -Ea/2.303R. 23. A catalyst which is in a different physical state from the reaction it catalyzes is a ..... catalyst. A) Transition. B) Homogeneous. C) Inhibitor. D) Heterogeneous. Show Answer Correct Answer: D) Heterogeneous. 24. The half-life of a first-order reaction is 10 minutes. What is the time required for 75% of the reactant to decompose? A) 20min. B) 10min. C) 40 min. D) 30min. Show Answer Correct Answer: A) 20min. 25. The rate of reaction is doubled when the concentration of a reactant is doubled. The order of the reaction with respect to this reactant is: A) 3. B) 0. C) 1. D) 2. Show Answer Correct Answer: C) 1. 26. It is the study of reaction rates and the mechanism or step sequence under which reactions occur; A) Chemical kinetics. B) Thermodynamics. C) Chemical emetics. D) Chemical mechanics. Show Answer Correct Answer: A) Chemical kinetics. 27. What is the significance of the order of a reaction? A) It specifies the physical state of the reactants involved. B) It determines the temperature at which the reaction occurs. C) It defines the activation energy required for the reaction. D) It indicates how the rate is affected by the concentration of reactants. Show Answer Correct Answer: D) It indicates how the rate is affected by the concentration of reactants. 28. What happen in a steady state? A) Heat is evolved. B) Nothing is happening. C) Concentration of an intermediate is constant. D) Product is being formed faster than reactants regenerated. Show Answer Correct Answer: C) Concentration of an intermediate is constant. 29. A reaction has a rate law expressed as $\text{Rate} = k[\text{A}]^2[\text{B}]$ A) First-order. B) Second-order. C) Third-order. D) Zero-order. Show Answer Correct Answer: C) Third-order. 30. True or False:All collisions of molecules result in chemical change. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 31. Given the following rate law, rate = k[A]$^{2}$[B]if [A] were doubled, what must happen to [B] to keep the rate constant? A) Must tripled. B) Must be quartered. C) Must be havled. D) Must double. Show Answer Correct Answer: B) Must be quartered. 32. Identify the order of reaction from the following unit for its rate constant:L mol$^{-1}$s$^{-1}$ A) 2. B) 3. C) 1. D) 4. Show Answer Correct Answer: A) 2. 33. What is the effect of increasing temperature on reaction rates? A) Increasing temperature decreases reaction rates by reducing energy to the reactants. B) Increasing temperature generally increases reaction rates by providing more energy to the reactants. C) Increasing temperature has no effect on reaction rates. D) Increasing temperature only affects reaction rates in gaseous reactions. Show Answer Correct Answer: B) Increasing temperature generally increases reaction rates by providing more energy to the reactants. 34. Which of the following statements about the rate of a chemical reaction is true? A) The rate is unaffected by the presence of a catalyst. B) The rate is independent of temperature. C) The rate is inversely proportional to the surface area of reactants. D) The rate is directly proportional to the concentration of reactants. Show Answer Correct Answer: D) The rate is directly proportional to the concentration of reactants. 35. Temperature coefficient = A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: B) 2. 36. An activated complex is a chemical species that is A. Stable and has low PE.B. Stable and has high PE.C. Unstable and has low PE.D. Unstable and has high PE. A) A. B) B. C) C. D) D. Show Answer Correct Answer: D) D. 37. Catalyst Helps in attaining the equilibrium faster, A) TRUE. B) FALSE. C) All the above. D) None of the above. Show Answer Correct Answer: A) TRUE. 38. How is reaction rate typically expressed in terms of the change in concentration of reactants or products over time? A) Change in pressure over time. B) Change in temperature over time. C) Change in volume over time. D) Change in concentration of reactants or products over time. Show Answer Correct Answer: D) Change in concentration of reactants or products over time. 39. What does the symbol 'k' represent in a rate law? A) 'k' is the rate constant, which is specific to a particular reaction at a given temperature. B) 'k' is a variable representing the concentration of reactants. C) 'k' indicates the reaction order in a rate law. D) 'k' represents the equilibrium constant for a reaction. Show Answer Correct Answer: A) 'k' is the rate constant, which is specific to a particular reaction at a given temperature. 40. What is the half-life (t$_{1/2}$) of a reactant with a decay constant $\left(\lambda\right)$ A) 2. B) 3. C) 1. D) 4. Show Answer Correct Answer: C) 1. 41. The slowest step in a reaction mechanism determines the: A) Overall rate of reaction. B) Activation energy. C) Products formed. D) Reaction order. Show Answer Correct Answer: A) Overall rate of reaction. 42. If a data set (Concentration-Time) that follows zero-order kinetics is plotted on a semi log graph paper. Theoretically, what would the shape of the plot be? A) Convex. B) Concave. C) Linear. D) None of the above. Show Answer Correct Answer: A) Convex. 43. Overall reaction order can be determined how? A) Subtracting the powers to which reactant concentrations are raised in the rate law. B) Adding the powers to which reactant concentrations are raised in the rate law. C) Dividing the powers to which reactant concentrations are raised in the rate law. D) Multiplying the powers to which reactant concentrations are raised in the rate law. Show Answer Correct Answer: B) Adding the powers to which reactant concentrations are raised in the rate law. 44. According to collision theory, which of the following factors affects the rate of reaction? A) Concentration of reactants. B) Temperature. C) Presence of a catalyst. D) All of the above. Show Answer Correct Answer: D) All of the above. 45. On a Maxwell-Boltzmann distribution curve, a suitable label for the y-axis is A) Activation Energy (Ea). B) Enthalpy. C) Fraction of particles with Kinetic Energy (E). D) Kinetic Energy (E). Show Answer Correct Answer: C) Fraction of particles with Kinetic Energy (E). 46. Which of these changes with time for a first-order reaction? A. Rate of reactionB. Rate constantC. Half-life A) A & B only. B) A & C only. C) A only. D) B only. Show Answer Correct Answer: C) A only. 47. In an experiment, the decomposition of hydrogen peroxide is catalyzed by manganese dioxide. What role does manganese dioxide play in this reaction? A) It acts as a reactant in the reaction. B) It increases the activation energy required for the reaction. C) It decreases the rate of reaction. D) It provides an alternative pathway with a lower activation energy. Show Answer Correct Answer: D) It provides an alternative pathway with a lower activation energy. 48. In pseudo unimolecular reactions A) Both the reactants are present in low concentration. B) Both the reactants are present in same concentration. C) One of the reactant is present in excess. D) One of the reactant is non-reactive. Show Answer Correct Answer: C) One of the reactant is present in excess. 49. Define a zero order reaction and provide an example. A) The decomposition of nitrous oxide (N2O) on a hot platinum surface. B) The synthesis of ammonia from nitrogen and hydrogen. C) The reaction of hydrogen and oxygen to form water. D) The combustion of methane in oxygen. Show Answer Correct Answer: A) The decomposition of nitrous oxide (N2O) on a hot platinum surface. 50. How do you calculate the half-life of a first order reaction? A) T1/2 = 0.693/k. B) T1/2 = 2.303/k. C) T1/2 = 1/k. D) T1/2 = k/0.693. Show Answer Correct Answer: A) T1/2 = 0.693/k. 51. Which of these conditions exist at equilibrium? A) The forward reaction happens faster than the reverse reaction. B) The forward reaction happens slower than the reverse reaction. C) The forward reaction and the reverse reaction happen at the same rate. D) The forward reaction has stopped. Show Answer Correct Answer: C) The forward reaction and the reverse reaction happen at the same rate. 52. A catalyst does not alter ..... A) SPEED. B) RATE. C) DELTA G. D) ALL OF THESE. Show Answer Correct Answer: C) DELTA G. 53. Chemical kinetics can also be used to find out about reaction mechanisms and transition states. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 54. Which is an appropriate unit for the rate of a reaction? A) Mol dm$^{-3}$ s$^{-1}$. B) S. C) Mol dm$^{-3}$. D) Mol dm$^{-3}$ s. Show Answer Correct Answer: A) Mol dm$^{-3}$ s$^{-1}$. 55. Species that are form in one step of reaction mechanism and used up in another step are called A) Activated complex. B) Catalyst. C) Inhibitors. D) Intermediate. Show Answer Correct Answer: D) Intermediate. 56. What are the two criteria for a collision to be effective? A) Proper orientation and particle size. B) Enough energy to overcome the activation energy and proper orientation. C) Enough energy to overcome the activation energy and homogeneity. D) Proper orientation and heterogeneity. Show Answer Correct Answer: B) Enough energy to overcome the activation energy and proper orientation. 57. Catalysts are agents that increase reaction rates without themselves being used up. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 58. Which factors affect the rate of a reaction? A) Temperature, pressure and humidity. B) Temperature, reactant concentration and catalyst. C) Temperature, reactant concentration and pressure. D) Temperature, product concentration and container volume. Show Answer Correct Answer: B) Temperature, reactant concentration and catalyst. 59. Which of the following expressions is the accurate depiction of the rate degradation of tetracycline?Tetraciclyne (Tet) Kf /Kr Epianhydrotetracycline A) D[Tet]/dt = Kf[Ted]-Kr[Epi]. B) -d[Tet]/dt = Kr[Ted]-Kf[Epi]. C) -d[Tet]/dt = Kf[Ted] + Kr[Epi]. D) -d[Tet]/dt = Kf[Ted]-Kr[Epi]. Show Answer Correct Answer: D) -d[Tet]/dt = Kf[Ted]-Kr[Epi]. 60. Noah is conducting an experiment where the rate law is $k[A]^2[B]$ A) There are two molecules of A in the balanced equation. B) The reaction is second order overall. C) The rate is doubled when [A] is doubled. D) The rate quadruples when [A] is doubled. Show Answer Correct Answer: D) The rate quadruples when [A] is doubled. ← 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 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 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books