This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics – Quiz 11 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 11 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The half-life of a reaction is the time in which ..... A) The concentration of a product is reduced to one half of its initial concentration. B) The concentration of a reactant is reduced to one half of its initial concentration. C) All the above. D) None of the above. Show Answer Correct Answer: B) The concentration of a reactant is reduced to one half of its initial concentration. 2. Which of the following expression is the accurate depiction of the rate of degradation of triazolam? Triazolam ..... Kf ..... hydrolysis product Kr A) -d[Triazolam]/dt = Kf[Triazolam]-Kr[Hydrolysis Product]. B) D[Triazolam]/dt = Kr[Triazolam]-Kf[Hydrolysis Product]. C) -d[Triazolam]/dt = Kr[Triazolam]-Kf[Hydrolysis Product]. D) -d[Triazolam]/dt = Kf[Triazolam] + Kr[Hydrolysis Product]. Show Answer Correct Answer: A) -d[Triazolam]/dt = Kf[Triazolam]-Kr[Hydrolysis Product]. 3. For two particles to react when they collide what must be true according to collision theory? A) They must both have the same kinetic energy. B) All their chemical bonds must be broken. C) They must collide with the correct geometry or orientation. D) They must be in the gaseous or liquid state. Show Answer Correct Answer: C) They must collide with the correct geometry or orientation. 4. What is the significance of the collision theory in kinetics? A) Collision theory states that all collisions result in reactions. B) Collision theory is significant in kinetics as it provides a framework for understanding how and why reactions occur, influencing reaction rates. C) Collision theory only applies to gas reactions. D) Collision theory is unrelated to reaction rates. Show Answer Correct Answer: B) Collision theory is significant in kinetics as it provides a framework for understanding how and why reactions occur, influencing reaction rates. 5. When the concentration of reactant molecules is increased, the rate of reaction increases. The best explanation is:As the reactant concentration increases, (a) the average kinetic energy of molecules increases.(b) the frequency of molecular collisions increases.(c) the rate constant increases.(d) the activation energy increases. A) A. B) B. C) C. D) D. Show Answer Correct Answer: B) B. 6. Explain the role of surface area in reaction rates. A) Surface area has no effect on reaction rates whatsoever. B) Increasing surface area slows down the reaction by creating barriers. C) A larger surface area increases reaction rates by allowing more collisions between reactant particles. D) A larger surface area decreases reaction rates by reducing collisions. Show Answer Correct Answer: C) A larger surface area increases reaction rates by allowing more collisions between reactant particles. 7. Catalyst act by ..... A) Providing alternate pathway. B) Increasing activation energy. C) Changing reactant. D) No effect. Show Answer Correct Answer: A) Providing alternate pathway. 8. A drug is given intravenously and the blood concentration measured at 1 and 4 hours are 26 and 18 mcg/ml. What is the half life using first order kinetics? A) 5.7 hours. B) 5.7 days. C) 7.5 hours. D) 8 days. Show Answer Correct Answer: A) 5.7 hours. 9. In the reaction 2A $\rightarrow$ B + C, if the rate of disappearance of A is 0.60 M/s, what is the rate of appearance of B? A) 0.15 M/s. B) 1.20 M/s. C) 0.30 M/s. D) 0.60 M/s. Show Answer Correct Answer: C) 0.30 M/s. 10. The first order rate constant for the decomposition of 0.5 M compound A at 100$^{o}$C is 0.03 min$^{-1}$. Calculate the half-life of A. A) 1.5 min. B) 8.3 min. C) 23.1 min. D) 66.7 min. Show Answer Correct Answer: C) 23.1 min. 11. What is the energy needed for reactant particles to change into products? A) Potential. B) Kinetic. C) Activation. D) Conversion. Show Answer Correct Answer: C) Activation. 12. The value of rate constant of a pseudo first order reaction ..... A) Depends on the concentration of reactants present in small amount. B) Depends on the concentration of reactants present in excess. C) Is independent of the concentration of reactants. D) Depends only on temperature. Show Answer Correct Answer: A) Depends on the concentration of reactants present in small amount. 13. In the presence of a catalyst, the heat evolved or absorbed during the reaction A) Increases. B) Decreases. C) Unchanged. D) None of the above. Show Answer Correct Answer: C) Unchanged. 14. Which statement is not correct regarding the function of a catalyst? A) It affects the rate of a chemical reaction. B) It lowers the energy of the product, causing the reaction to be more exothermic. C) It changes the mechanism of a reaction. D) It lowers the activation energy. Show Answer Correct Answer: B) It lowers the energy of the product, causing the reaction to be more exothermic. 15. A pseudo zero-order reaction is one in which:THE RATE DEPENDS ON THE CONCENTRATION OF ONE OF THE REACTANTS, WHICH IS EITHER VERY LARGE OR IS A CONSTANT A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 16. Given the reaction inside a container of CO$_{2}$(g) + H$_{2}$O(g) $\rightarrow$ A) The rate increases. B) The rate decreases. C) The rate will remain the same. D) It has no effect. Show Answer Correct Answer: A) The rate increases. 17. Among the solids, the rate increases with ..... in particle size A) Increase. B) Decrease. C) Remains same. D) None. Show Answer Correct Answer: B) Decrease. 18. For 2A + B $\rightarrow$ 2C, the rate of production of C has been found to be 12 M/s. During that reaction, the rate of reaction was? A) 12 M/s. B) 24 M/s. C) 6 M/s. D) Cannot tell without more data. Show Answer Correct Answer: C) 6 M/s. 19. A compound has a half-life of 14 min. How much time will it take a 12 mol sample to decay to 1.5 mol? A) 14 min. B) 28 min. C) 42 min. D) 56 min. Show Answer Correct Answer: C) 42 min. 20. What is meant by the order of a reaction? A) The order of a reaction is the sum of the powers of the concentration terms in the rate law. B) The order of a reaction is the concentration of the reactants at equilibrium. C) The order of a reaction refers to the time it takes for the reaction to complete. D) The order of a reaction is determined by the temperature of the reaction. Show Answer Correct Answer: A) The order of a reaction is the sum of the powers of the concentration terms in the rate law. 21. The following are the kinds of intermolecular interactions are involved in solution formation EXCEPT: A) Solute-solute. B) Solvent-solvent. C) Solvent-solute. D) Solution-solvent. Show Answer Correct Answer: D) Solution-solvent. 22. A possible rate law for a third overall order of a reaction is ..... A) Rate = k [A]$^{2}$[B]$^{2}$. B) Rate = k [A][B]$^{3}$. C) Rate = k [A]$^{3}$ [B]. D) Rate = k [A]$^{2}$[B]. Show Answer Correct Answer: D) Rate = k [A]$^{2}$[B]. 23. The half-life of a substance in a certain enzyme catalysed reaction is 138 s. The time required for the concentration of the substance to fall from 1.28 mg L$^{-1}$ to 0.04 mg L$^{-1}$, is A) 414 s. B) 552 s. C) 690 s. D) 276 s. Show Answer Correct Answer: C) 690 s. 24. A reaction follows the rate law Rate = k[A][B]. What happens to the rate when [A] is doubled and [B] is tripled? A) Increases 2 times. B) Increases 3 times. C) Increases 6 times. D) Unchanged. Show Answer Correct Answer: C) Increases 6 times. 25. Catalyst catalyses the ..... A) Spontaneous reactions. B) Nonspontaneous reactions. C) Both. D) None. Show Answer Correct Answer: A) Spontaneous reactions. ← 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