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 9 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 9 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. For a given process, the Ea forward is +120kJ. For the reverse reaction, the Ea is +70kJ. What is the energy change for the forward process? A) +50kJ. B) -50kJ. C) +190kJ. D) 0kJ. E) -190kJ. Show Answer Correct Answer: A) +50kJ. 2. If the rate of formation of ammonia (NH$_{3}$) is 0.50 M/s, what is the rate of disappearance of H$_{2}$?N$_{2}$ (g) + 3 H$_{2 }$(g) $\rightarrow$ 2 NH$_{3}$ (g) A) .75 M/s. B) .25 M/s. C) 1 M/s. D) .125 M/s. Show Answer Correct Answer: A) .75 M/s. 3. What is the term for the study of reaction mechanisms? A) Chemical kinetics. B) Stoichiometry. C) Thermodynamics. D) Chemical equilibrium. Show Answer Correct Answer: A) Chemical kinetics. 4. For a given chemical reaction, the addition of a catalyst provides a different reaction pathway that A) Decreases the reaction rate and has a higher activation energy. B) Decreases the reaction rate and has a lower activation energy. C) Increases the reaction rate and has a higher activation energy. D) Increases the reaction rate and has a lower activation energy. Show Answer Correct Answer: D) Increases the reaction rate and has a lower activation energy. 5. What does the term 'activation energy' refer to in chemical reactions? A) Activation energy is the energy released during a chemical reaction. B) Activation energy is the energy required to break chemical bonds in reactants. C) Activation energy is the energy that determines the temperature of a reaction. D) Activation energy is the energy needed to initiate a chemical reaction. Show Answer Correct Answer: D) Activation energy is the energy needed to initiate a chemical reaction. 6. The half-life of a first-order reaction ..... A) Is constant. B) Is the time necessary for the reactant concentration to dropto half its original value. C) Does not depend on the initial reactant concentration. D) All of the choices are correct. Show Answer Correct Answer: B) Is the time necessary for the reactant concentration to dropto half its original value. 7. Which of the following is/are the fundamental idea(s) of collision theory? A) Molecules react by colliding together. B) The effective collisions must occur with certain minimum amounts of energy. C) In a large sample, the greater the number of effective collisions, and the faster the rate of reaction. D) All of the above. Show Answer Correct Answer: D) All of the above. 8. The rate constant of a reaction increases with temperature. This is because: A) The concentration of reactants increases. B) The activation energy increases. C) The frequency of collisions decreases. D) The number of effective collisions increases. Show Answer Correct Answer: D) The number of effective collisions increases. 9. According to collision theory, what must the reactants have in order to form products? A) The right size. B) Nothing. C) The right shape. D) Enough energy. Show Answer Correct Answer: D) Enough energy. 10. In a series of reactions, which is the rate-determining step? A) The slowest reaction. B) The fastest reaction. C) Main reaction involving the major reactant. D) The simplest reaction. Show Answer Correct Answer: A) The slowest reaction. 11. Half life of a pseudo order reaction depends on the initial concentration of the reactant? A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 12. Molecularity of reaction can never be graeter than A) 2. B) 10. C) 4. D) 3. Show Answer Correct Answer: D) 3. 13. Which sample of HCl(aq) reacts at the fastest rate with a 1.0-gram sample of iron filings? A) 10 mL of 3 M HCl(aq) at 25$^\circ$C. B) 10 mL of 3 M HCl(aq) at 10$^\circ$C. C) 10 mL of 1 M HCl(aq) at 25$^\circ$C. D) 10 mL of 1 M HCl(aq) at 10$^\circ$C. Show Answer Correct Answer: A) 10 mL of 3 M HCl(aq) at 25$^\circ$C. 14. Which of the following plots will show a linear relationship for a second order reaction? A) [A] vs time. B) [A]$^{2}$ vs time. C) Ln[A] vs time. D) $^{1}$/$_{[A]}$ vs time. Show Answer Correct Answer: D) $^{1}$/$_{[A]}$ vs time. 15. Suppose the reaction:A + 2B AB$_{2}$ occurs by the following mechanism:Step 1:A + B$\rightarrow$ AB slowStep 2:AB + B $\rightarrow$AB$_{2 }$fastOverall:A + 2B AB$_{2}$The rate law expression must be Rate = ..... A) K[B]$^{2}$. B) K[A][B]. C) K[B]. D) K[A]. Show Answer Correct Answer: B) K[A][B]. 16. The rate of a chemical reaction doubles for every 10$^\circ$ rise in temperature. If the temperature is raised by 50$^\circ$C, the rate of reaction increases by about A) 24 times. B) 10 times. C) 32 times. D) 64 times. Show Answer Correct Answer: C) 32 times. 17. Which of the following are true of reaction rates? A) II + III. B) II+III+IV. C) I+II+III. D) I+IV. Show Answer Correct Answer: A) II + III. 18. The reaction which takes place in a single step A) Elementary reaction. B) Complex reaction. C) Neutral reaction. D) None of the above. Show Answer Correct Answer: A) Elementary reaction. 19. The degradation rate constant of a reaction is 3.45 mg/ml*s. What would the order of the reaction be? A) Zero order. B) First order. C) All the above. D) None of the above. Show Answer Correct Answer: A) Zero order. 20. A catalyst increases the rate of a chemical reaction by A) Decreasing the activation energy. B) Increasing the activation energy. C) Reacting with reactants. D) Reacting with products. Show Answer Correct Answer: A) Decreasing the activation energy. 21. Given the following balanced equation:2NO(g) + Cl$_{2}$(g) $\rightarrow$ 2NOCl(g)If the rate of disappearance of Cl$_{2}$ is 4.84 x 10$^{-2}$ Ms$^{-1}$, what is the rate of disappearance of NO? A) 9.68 x 10$^{-2}$ Ms$^{-1}$. B) 2.42 x 10$^{-2}$ Ms$^{-1}$. C) 1.45 x 10$^{-2}$ Ms$^{-1}$. D) 3.67 x 10$^{-2}$ Ms$^{-1}$. Show Answer Correct Answer: A) 9.68 x 10$^{-2}$ Ms$^{-1}$. 22. The rate law for the reaction RCI + NaOH $\rightarrow$ ROH + NaCl is given by r=k [RCI]. The rate of reaction is A) Is increased by decreasing the temperature. B) Doubled by doubling the concentration of NaOH. C) Is unaffected by change in temperature. D) Is halved by reducing conentration of RCl by one half. Show Answer Correct Answer: D) Is halved by reducing conentration of RCl by one half. 23. How does temperature affect the rate of reaction? A) Increasing temperature typically increases the rate of reaction. B) Lower temperatures increase the rate of reaction. C) Higher temperatures slow down reactions. D) Temperature has no effect on reaction rates. Show Answer Correct Answer: A) Increasing temperature typically increases the rate of reaction. 24. For a first order reaction, the slope of the plot of In [R] vs time gives A) K/2.303. B) -k. C) K. D) -k/2.303. Show Answer Correct Answer: B) -k. 25. Degradation of a drug was analyzed to be first order. The formulation initially contained a concentration of 10% w/v of the drug. The half-life of a drug was found to be 7h. Compute the half life of the same drug formulation with an initial concentration 30% (w/v). A) 3.2 hours. B) 2.5 hours. C) 14 hours. D) 7 hours. Show Answer Correct Answer: D) 7 hours. 26. Adding a catalyst to a chemical reaction changes the rate of reaction by causing A) An increase in the heat of reaction. B) A decrease in the activation energy. C) A decrease in the heat of reaction. D) An increase in the activation energy. Show Answer Correct Answer: B) A decrease in the activation energy. 27. Which of the following includes all the aims of Kinetics?(i) to measure the rate of a reaction(ii) to be able to predict the rate of a reaction(iii) to be able to establish the mechanism by which a reaction occurs(iv) to be able to control a reaction A) (i), (ii) and (iii). B) (i) and (ii). C) (i) and (iii). D) (i), (ii), (iii) and (iv). Show Answer Correct Answer: D) (i), (ii), (iii) and (iv). 28. How can reaction mechanisms be determined from experimental data? A) Through visual observation of color changes. B) By calculating the total energy released in the reaction. C) By measuring temperature changes only. D) Reaction mechanisms can be determined by analyzing kinetic data, identifying intermediates, and testing mechanistic hypotheses through experimental variations. Show Answer Correct Answer: D) Reaction mechanisms can be determined by analyzing kinetic data, identifying intermediates, and testing mechanistic hypotheses through experimental variations. 29. Which of the elementary steps has the highest activation energy? A) Slow. B) Fast. C) All the above. D) None of the above. Show Answer Correct Answer: A) Slow. 30. $In a chemistry lab experiment, Rohan observed that for a certain reaction, a plot of ln[A] versus time gives a straight line with a slope of-1.46s^{-1}. Evelyn and Mia are discussing about the order of the reaction A. Can you help them determine the order of the reaction?$ A) 1. B) 3. C) 0. D) 2. Show Answer Correct Answer: A) 1. 31. What does chemical kinetics study? A) The formation of compounds. B) The rates of chemical reactions. C) The structure of molecules. D) The properties of elements. Show Answer Correct Answer: B) The rates of chemical reactions. 32. Which of the following statements is not correct about order of a reaction? A) The order of a reaction can be a fractional number . B) Order of a reaction is experimentally determined quantity. C) The order of a reaction is always equal to the sum of the stoichiometric coefficients of reactants in the balanced chemical equation for a reaction. D) The order of a reaction is the sum of the powers of molar concentration of the reactants in the rate law expression. Show Answer Correct Answer: C) The order of a reaction is always equal to the sum of the stoichiometric coefficients of reactants in the balanced chemical equation for a reaction. 33. For second order reaction, the initial concentration of reactant A is 0.24 M. If the rate constant is 8.1 x 10$^{-2}$ M$^{-1}$ s$^{-1}$, what is the concentration of A after 29 seconds? A) 0.45 M. B) 0.15 M. C) 0.02 M. D) 0.30 M. Show Answer Correct Answer: B) 0.15 M. 34. If a reaction is first order in A and zero order in B, the rate law can be written as: A) Rate = k[A]. B) Rate = k[B]. C) Rate = k[A]$^\circ$[B]. D) Rate = k[A][B]. Show Answer Correct Answer: A) Rate = k[A]. 35. To measure rate of reaction, either decreasing mass of solid reactant or increasing volume of gaseous products are used. Which of the following reactions uses increasing volume of gaseous product method to measure the its rate? A) Reaction between iron metal and air. B) Reaction between sodium hydroxide and nitric acid. C) Reaction between table salt and water. D) Reaction between hydrochloric acid and aluminum metal. Show Answer Correct Answer: D) Reaction between hydrochloric acid and aluminum metal. 36. Given the chemical equation, Haber Prosess N$_{2}$(g) + 3H$_{2}$ (g) $\rightarrow$ 2NH$_{3 }$(g)Based on this reaction, first order for concentration N$_{2}$ and zero order for concentration H$_{2}$.Write rate law: A) Rate = K [H$_{2}$]$^{0}$. B) Rate = K [N$_{2}$]$^{1}$ [H$_{2}$]$^{3}$. C) Rate = K [N$_{2}$]$^{1}$. D) Rate = K [N$_{2}$]$^{1}$ [H$_{2}$]$^{1}$. Show Answer Correct Answer: C) Rate = K [N$_{2}$]$^{1}$. 37. In ..... state rate of the reaction is maximum A) Powdered state. B) Gas state. C) Plasma state. D) Liquid state. Show Answer Correct Answer: A) Powdered state. 38. Consider this reaction:2SO$_{2(g) }$+ O$_{2(g)}$ $\rightarrow$ A) 0.120. B) 0.035. C) 0.025. D) 0.050. Show Answer Correct Answer: C) 0.025. 39. For a first-order reaction with a half-life of 30 minutes, what fraction of reactant remains after 90 minutes? A) 1/4. B) 1/2. C) 1/8. D) 1/16. Show Answer Correct Answer: C) 1/8. 40. Baking a turkey in an oven is an ..... A) Exothermic Reaction. B) Endothermic Reaction. C) All the above. D) None of the above. Show Answer Correct Answer: B) Endothermic Reaction. 41. Under suitable conditions it is possible to form solutions that contain a greater amount of solvent than needed to form a saturated solution. Such solutions are supersaturated. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 42. For the elementary reaction the rate ofdisappearance of M increases by a factor of 8 upondoubling the concentration of M. The order of the reactionwith respect to M is: A) 1. B) 4. C) 3. D) 2. Show Answer Correct Answer: C) 3. 43. Which of the following factors increases only the effectiveness of collisions? A) Particle size. B) Concentration. C) Catalysts. D) Temperature. Show Answer Correct Answer: C) Catalysts. 44. What factors effect rate of reaction? A) Temperature, Concentration, Pressure and Energy. B) Surface Area, Concentration, Energy and Pressure. C) Temperature, Pressure, Concentration and Surface area. D) Pressure, Surface area, Density and Energy. Show Answer Correct Answer: C) Temperature, Pressure, Concentration and Surface area. 45. In an experiment, a student observes that increasing the concentration of a reactant doubles the rate of reaction. What is the order of the reaction with respect to that reactant? A) Third order. B) First order. C) Second order. D) Zero order. Show Answer Correct Answer: B) First order. 46. The reactions of high order are rare because A) Many body collisions involve very high activation energy. B) Many body collisions have a very low probability. C) Many body collisions are not energetically favoured. D) Many body collisions can take place in gaseous phase only. Show Answer Correct Answer: B) Many body collisions have a very low probability. 47. What is the definition of chemical kinetics? A) Chemical kinetics is the study of the rates of chemical reactions and the factors that influence them. B) Chemical kinetics is the analysis of the physical properties of substances. C) Chemical kinetics is the study of the structure of molecules. D) Chemical kinetics focuses on the equilibrium of chemical reactions. Show Answer Correct Answer: A) Chemical kinetics is the study of the rates of chemical reactions and the factors that influence them. 48. For a reaction P + Q $\rightarrow$ 2 R + S, the incorrect statement is A) Rate of disappearance of Q = 2 x Rate of appearance of R. B) Rate of disappearance of Q = 1/2 x Rate of appearance of R. C) Rate of disappearance of Q = Rate of disappearance of P. D) Rate of disappearance of P = Rate of appearance of S. Show Answer Correct Answer: C) Rate of disappearance of Q = Rate of disappearance of P. 49. When the galvanic cell reached at equilibrium then what will happen A) E$^{0}$cell=0. B) Ecell=0. C) Delta G$^{o }$=0. D) None of thes. Show Answer Correct Answer: B) Ecell=0. 50. A huge amount of the catalyst is always required to catalyse any reactants. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 51. Rate of a zero order degradation reaction (dC/dt) is plotted against initial concentration. What would the trend of the resulting profile be? A) A declining curve. B) Declining straight line. C) Inclining straight line. D) A flat straight line parallel to the x-axis. Show Answer Correct Answer: D) A flat straight line parallel to the x-axis. 52. A 1-cubic-centimeter cube of sodium reacts more rapidly in water at 25$^\circ$C than does a 1-cubic-centimeter cube of calcium at 25$^\circ$C. The difference in rate of reaction is most closely associated with the different A) Density of the metals. B) Concentration of the metals. C) Nature of the metals. D) Surface area of the metal cubes. Show Answer Correct Answer: C) Nature of the metals. 53. What is collision theory? A) Molecules must collide in the correct orientation with enough energy to bond. B) Molecules need enough energy to collide and react. C) Atoms constantly collide and react. D) The minimum energy needed for atoms to react. Show Answer Correct Answer: A) Molecules must collide in the correct orientation with enough energy to bond. 54. For a zero-order reaction with a rate constant k=0.1 mol/L/s, how long will it take for the concentration to decrease from 0.5 mol/L to 0.2 mol/L? A) 10 sec. B) 5 sec. C) 3 sec. D) 12 sec. Show Answer Correct Answer: B) 5 sec. 55. If two reactants collided with energy but no reaction occurred, what would the most like explanation be? A) The collision was too soft. B) The colliding particles were too big. C) The colliding particles were in the correct orientation. D) The colliding particles were in the incorrect orientation. Show Answer Correct Answer: D) The colliding particles were in the incorrect orientation. 56. Limestone chunks are reaction with hydrochloric acid solution at constant temperature with average speed. If we crash the chunks of limestone into powder how would speed of reaction change? A) Reaction does not change. B) Reaction slows down. C) Reaction stops. D) Reaction speeds up. Show Answer Correct Answer: D) Reaction speeds up. 57. Which of the following is a special and distinct class of catalysts comprised of naturally occurring biological substances? A) Homogeneous catalyst. B) Heterogeneous catalyst. C) Inhibitor. D) Enzyme. Show Answer Correct Answer: D) Enzyme. 58. What is the half-life of a first-order reaction dependent on? A) Pressure only. B) Rate constant. C) Temperature only. D) Initial concentration. Show Answer Correct Answer: B) Rate constant. 59. For the reaction A + 2 B$\rightarrow$C, the reaction rate is doubled if the concentration of A is doubled. The rate is increased by four times when concentrations of both A and B are increased by four times. The order of reaction is A) 0. B) 1. C) 2. D) 3. Show Answer Correct Answer: B) 1. 60. For the reaction 4D + E $\rightarrow$ 3F, how does the rate of disappearance of D compare to the rate of production of F? A) The rate of disappearance of D is the same as the rate of appearance of F. B) The rate of disappearance of D is 3/4 the rate of appearance of F. C) The rate of disappearance of D is 4/3 the rate of appearance of F. D) The rate of disappearance of D is twice the rate of appearance of F. Show Answer Correct Answer: C) The rate of disappearance of D is 4/3 the rate of appearance of F. ← 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