This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics – Quiz 17 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 17 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of the following best describes why increasing temperature increase reaction rate? A) Activation energy is reduced. B) Collisions become more frequent. C) Collisions become more energetic. D) Collisions become more frequent and more energetic. Show Answer Correct Answer: D) Collisions become more frequent and more energetic. 2. Substance that speeds up chemical reactions but are not permanently changing themselves are called A) Mechanisms. B) Catalysts. C) Inhibitors. D) Activators. Show Answer Correct Answer: B) Catalysts. 3. What is the Arrhenius equation and its significance? A) The Arrhenius equation is used to determine the pH of a solution. B) The Arrhenius equation describes the relationship between temperature and reaction rates, highlighting the effect of activation energy. C) The Arrhenius equation calculates the concentration of reactants in a solution. D) The Arrhenius equation predicts the color change of a chemical reaction. Show Answer Correct Answer: B) The Arrhenius equation describes the relationship between temperature and reaction rates, highlighting the effect of activation energy. 4. 2 reactants which are dye (0.0001 M) and OH-(1.0 M) reacts to form products. The rate law for this reaction is Rate = k[OH-]$^{x}$[dye]$^{y}$ A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 5. A 5.0-gram sample of zinc and a 50.-milliliter sample of hydrochloric acid are used in a chemical reaction. Which combination of these samples has the fastest reaction rate? A) A zinc strip and 1.0 M HCl(aq). B) A zinc strip and 3.0 M HCl(aq). C) Zinc powder and 1.0 M HCl(aq). D) Zinc powder and 3.0 M HCl(aq). Show Answer Correct Answer: D) Zinc powder and 3.0 M HCl(aq). 6. If the temperature is reduced, a reaction rate will ..... A) Increase. B) Decrease. C) Stay the same. D) None of the above. Show Answer Correct Answer: B) Decrease. 7. What is the definition of reaction rate in chemical kinetics? A) The temperature at which a chemical reaction occurs. B) The speed at which a chemical reaction takes place. C) The amount of reactants used in a chemical reaction. D) The color change observed during a chemical reaction. Show Answer Correct Answer: B) The speed at which a chemical reaction takes place. 8. For the reaction 2A+B$\rightarrow$C, if the rate law is Rate=k[A]$^{2}$, the molecularity and order are: A) 3, 2. B) 2, 3. C) 3, 3. D) 2, 2. Show Answer Correct Answer: A) 3, 2. 9. Two reactant particles collide with proper orientation.The collision will be effective if the particles have A) High activation energy. B) High ionization energy. C) Sufficient kinetic energy. D) Sufficient potential energy. Show Answer Correct Answer: C) Sufficient kinetic energy. 10. Decreasing the particle size increases the reaction rate because A) It makes particles move faster. B) It increases the likelihood of collisions with the correct geometry. C) It decreases the surface area available to react. D) More surface area allows an increase in the number of collisions. Show Answer Correct Answer: D) More surface area allows an increase in the number of collisions. 11. In a(n) ..... reaction, the reactants exist in two different phases A) Heterogeneous. B) Two-state. C) Complex. D) Intermediate. Show Answer Correct Answer: A) Heterogeneous. 12. For the reaction A + H$_{2}$O $\rightarrow$ products, find the rate of the reaction when [A] = 0.75 M, k= 0.02. A) 0.0003 Ms$^{-1}$. B) 0.02 Ms$^{-1}$. C) 0.015 Ms$^{-1}$. D) 0.026 Ms$^{-1}$. Show Answer Correct Answer: C) 0.015 Ms$^{-1}$. 13. What does the term 'pseudo first order' refer to? A) A reaction that is zero order. B) A reaction that has no order. C) A reaction that is first order in all conditions. D) A reaction that is actually second order but behaves like first order. Show Answer Correct Answer: D) A reaction that is actually second order but behaves like first order. 14. A catalyst changes the rate of a reaction by A. Changing pH.B. Increasing the temperature.C. Decreasing the energy of the products.D. Providing an alternate reaction mechanism. A) A. B) B. C) C. D) D. Show Answer Correct Answer: D) D. 15. Reaction rate means ..... A) Amount of product formed. B) Speed of reaction. C) Concentration of reacting particles. D) Combining reactants with products. Show Answer Correct Answer: B) Speed of reaction. 16. A 5% drug solution decomposes with a rate constant, k, of 0.05 /day. Calculate the time for the drug concentration to degrade to 2.5 mg/mL? A) 60 days. B) 60 hours. C) 55 days. D) 3 days. Show Answer Correct Answer: A) 60 days. 17. The following are the terms used to describe the relationship between the rate of a chemical reaction and the concentration of its reactants EXCEPT A) Rate laws. B) Differential rate laws. C) Rate equations. D) Chemical kinetics. Show Answer Correct Answer: D) Chemical kinetics. 18. Which of the following is an acceptable way to measure the reaction rate for the reaction between copper and silver nitrate?Cu(s) + 2AgNO$_{3}$(aq) $\rightarrow$ 2Ag(s) + Cu(NO$_{3}$)$_{2}$(aq) A) Change in color (colorimetry). B) Change in conductivity. C) Change in mass. D) Change in volume of gas produced. Show Answer Correct Answer: A) Change in color (colorimetry). 19. Which is the rate determining step in a chemical reaction? A) Fast step. B) Slow step. C) Step with least activation energy. D) None of the above. Show Answer Correct Answer: B) Slow step. 20. The reaction 3 A $\rightarrow$B +C would be a zero order reaction when A) The rate of reaction is proportional to square of concentration of A. B) The rate of reaction remains the same al any concentration of A. C) The rate of reaction doubles if concentration of B is increased to double. D) The rate remains unchanged at any concentration of B and C. Show Answer Correct Answer: B) The rate of reaction remains the same al any concentration of A. 21. The rate contant of a reaction is 3 x 10$^{-3 }$bar$^{-1}$sec$^{-1 }$what is the order A) Zero. B) One. C) Two. D) Three. Show Answer Correct Answer: C) Two. 22. Which of the following statements is true about the activation energy of a reaction? A) It is the energy required to start a reaction. B) It is the energy released during a reaction. C) It is the energy required to maintain a reaction. D) It is the energy required to stop a reaction. Show Answer Correct Answer: A) It is the energy required to start a reaction. 23. The first order constant rate unit is A) Time-1. B) Mass.time-1. C) Mass-1. D) None of the above. Show Answer Correct Answer: A) Time-1. 24. The rate constant for a reaction of zero order in A is 0.0030 mol L$^{-1}$s$^{-1}$. How long will it take for the initial concentration of A to fall from 0.10 M to 0.075 M . A) 8.3 s. B) 0.83 s. C) 1.62 s. D) 0.162 s. Show Answer Correct Answer: A) 8.3 s. 25. Mark the incorrect statements. a) Catalyst provides an alternative pathway to reaction mechanism. b) Catalyst only raises the activation energy.c) Catalyst lowers the activation energy. d) Catalyst alters enthalpy change of the reaction. A) A, b. B) B, D. C) C, D. D) A, C. Show Answer Correct Answer: B) B, 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