This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics – Quiz 25 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 25 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of the following increase the reaction rate? A) Less surface area. B) Lower temperature. C) An inhibitor. D) Increased concentration. Show Answer Correct Answer: D) Increased concentration. 2. 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. 3. 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. 4. For the reaction, A(g) + B(g) $\rightarrow$ A) 2. B) 6. C) 4. D) 9. Show Answer Correct Answer: D) 9. 5. Which statement best defines rate of reaction? A) The time taken for the reaction to reach completion. B) The speed at which the reaction occurs. C) The change in concentration of a reactant or product over time. D) The increase in concentration of a reactant or product over time. Show Answer Correct Answer: C) The change in concentration of a reactant or product over time. 6. What is the average rate of a reaction defined as? A) Change in volume over time. B) Change in concentration over time. C) Change in pressure over time. D) Change in temperature over time. Show Answer Correct Answer: B) Change in concentration over time. 7. 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. 8. In a first-order reaction, how does the rate change if the concentration is doubled? A) Rate quadruples. B) Rate doubles. C) Rate remains the same. D) Rate decreases. Show Answer Correct Answer: B) Rate doubles. 9. Rate of reaction depends on? A) Concentration of products. B) Concentration of reactants. C) Both a and b. D) None of the above. Show Answer Correct Answer: B) Concentration of reactants. 10. Which of the following is an endothermic reaction? A) Synthesis of aluminum oxide from its elements. B) Synthesis of water from its elements. C) Synthesis of hydrogen iodide from its elements. D) Synthesis of ammonia from its elements. Show Answer Correct Answer: C) Synthesis of hydrogen iodide from its elements. 11. 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) Decreasing temperature. B) Adding a catalyst. C) Reducing surface area. D) Diluting the reactants. Show Answer Correct Answer: B) Adding a catalyst. 12. The minimum amount of energy required to start a chemical reaction is called A) Entropy. B) Activation energy. C) Enthalpy. D) Free energy. Show Answer Correct Answer: B) Activation energy. 13. 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. 14. A catalyst is a substance which ..... the rate of a reaction A) Help in calculating. B) Does not affect. C) Increases. D) Decreases. Show Answer Correct Answer: C) Increases. 15. 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. 16. 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) C. D) D. Show Answer Correct Answer: B) B. 17. A reaction is 50% complete in 2 hrs afd 75% complete in 4hrs. what is the order of the reaction? A) Zero order. B) First order. C) Second order. D) Third order. Show Answer Correct Answer: B) First order. 18. Which of the following is pseudo first order reaction? A) Decomposition of ammonia on metal surface. B) Radioactive decay. C) Hydrolysis of Sucrose. D) Decomposition of N2O5. Show Answer Correct Answer: C) Hydrolysis of Sucrose. 19. Mathematically, pH is defined as; A) PH =-log[H$^{+}$]. B) PH =-log[OH$^{+}$]. C) PH = log[H$^{+}$]. D) PH =-antilog[H$^{+}$]. Show Answer Correct Answer: A) PH =-log[H$^{+}$]. 20. Using the Arrhenius Plot, the reaction rate was determined as 0.02mg.ml-1.day-1 for a zero-order reaction at 25C. The initial concentration of the drug was 500mg.ml-1. A) 2.5 years. B) 61 years. C) 6.85 years. D) 5.27 years. Show Answer Correct Answer: C) 6.85 years. 21. Given the balanced equation representing a reaction:2HCl(aq) + Na$_{2}$S$_{2}$O$_{3}$(aq) $\rightarrow$ S(s) + H$_{2}$SO$_{3}$(aq) + 2NaCl(aq)Decreasing the concentration of Na$_{2}$S$_{2}$O$_{3}$(aq) decreases the rate of reaction because the: A) Activation energy decreases. B) Activation energy increases. C) Frequency of effective collisions decreases. D) Frequency of effective collisions increases. Show Answer Correct Answer: C) Frequency of effective collisions decreases. 22. Factors affecting rate of the reaction A) Nature of the reactants. B) Temperature. C) Light. D) All the above. Show Answer Correct Answer: D) All the above. 23. Which explains why increasing the temperature increases the rate of a chemical reaction? A) More reactant particles possess energy greater than or equal to the activation energy. B) The activation energy decreases at higher temperatures. C) Reactant particles travel faster at higher temperatures. D) Reactant particles are more likely to be in the gaseous state at higher temperatures. Show Answer Correct Answer: A) More reactant particles possess energy greater than or equal to the activation energy. 24. A reaction has the rate law:Rate = k [A][B].What is the order of reaction with respect to A? A) 1st. B) 2nd. C) 3rd. D) 4th. Show Answer Correct Answer: A) 1st. 25. Reaction between ionic substance is ..... than covalent substance. A) Slower. B) Faster. C) Both are same. D) None. Show Answer Correct Answer: B) Faster. ← 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