This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics – Quiz 21 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 21 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. 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. 2. The rate constant of a reaction increases with temperature. This is because: A) The activation energy increases. B) The frequency of collisions decreases. C) The number of effective collisions increases. D) The concentration of reactants increases. Show Answer Correct Answer: C) The number of effective collisions increases. 3. According to collision theory, what must the reactants have in order to form products? A) The right size. B) The right shape. C) Enough energy. D) Nothing. Show Answer Correct Answer: C) Enough energy. 4. In a series of reactions, which is the rate-determining step? A) The simplest reaction. B) Main reaction involving the major reactant. C) The slowest reaction. D) The fastest reaction. Show Answer Correct Answer: C) The slowest reaction. 5. 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. 6. Molecularity of reaction can never be graeter than A) 3. B) 4. C) 2. D) 10. Show Answer Correct Answer: A) 3. 7. Which sample of HCl(aq) reacts at the fastest rate with a 1.0-gram sample of iron filings? A) 10 mL of 1 M HCl(aq) at 10$^\circ$C. B) 10 mL of 1 M HCl(aq) at 25$^\circ$C. C) 10 mL of 3 M HCl(aq) at 10$^\circ$C. D) 10 mL of 3 M HCl(aq) at 25$^\circ$C. Show Answer Correct Answer: D) 10 mL of 3 M HCl(aq) at 25$^\circ$C. 8. Which of the following plots will show a linear relationship for a second order reaction? A) [A] vs time. B) $^{1}$/$_{[A]}$ vs time. C) Ln[A] vs time. D) [A]$^{2}$ vs time. Show Answer Correct Answer: B) $^{1}$/$_{[A]}$ vs time. 9. 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[A]. B) K[B]. C) K[A][B]. D) K[B]$^{2}$. Show Answer Correct Answer: C) K[A][B]. 10. 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) 10 times. B) 24 times. C) 32 times. D) 64 times. Show Answer Correct Answer: C) 32 times. 11. Which of the following are true of reaction rates? A) II+III+IV. B) I+IV. C) II + III. D) I+II+III. Show Answer Correct Answer: C) II + III. 12. 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. 13. 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. 14. A catalyst increases the rate of a chemical reaction by A) Increasing the activation energy. B) Decreasing the activation energy. C) Reacting with reactants. D) Reacting with products. Show Answer Correct Answer: B) Decreasing the activation energy. 15. 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) 1.45 x 10$^{-2}$ Ms$^{-1}$. B) 2.42 x 10$^{-2}$ Ms$^{-1}$. C) 3.67 x 10$^{-2}$ Ms$^{-1}$. D) 9.68 x 10$^{-2}$ Ms$^{-1}$. Show Answer Correct Answer: D) 9.68 x 10$^{-2}$ Ms$^{-1}$. 16. The rate law for the reaction RCI + NaOH $\rightarrow$ ROH + NaCl is given by r=k [RCI]. The rate of reaction is A) Doubled by doubling the concentration of NaOH. B) Is halved by reducing conentration of RCl by one half. C) Is increased by decreasing the temperature. D) Is unaffected by change in temperature. Show Answer Correct Answer: B) Is halved by reducing conentration of RCl by one half. 17. 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. 18. For a first order reaction, the slope of the plot of In [R] vs time gives A) K. B) K/2.303. C) -k. D) -k/2.303. Show Answer Correct Answer: C) -k. 19. 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) 7 hours. B) 2.5 hours. C) 14 hours. D) 3.2 hours. Show Answer Correct Answer: A) 7 hours. 20. Adding a catalyst to a chemical reaction changes the rate of reaction by causing A) A decrease in the activation energy. B) An increase in the activation energy. C) A decrease in the heat of reaction. D) An increase in the heat of reaction. Show Answer Correct Answer: A) A decrease in the activation energy. 21. 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). 22. 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. 23. 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. 24. $In a chemistry lab experiment, Rohan observed that for a certain reaction, a plot of ln[A] versus time gives a straight line with a slope of-1.46s^{-1}. Evelyn and Mia are discussing about the order of the reaction A. Can you help them determine the order of the reaction?$ A) 0. B) 3. C) 1. D) 2. Show Answer Correct Answer: C) 1. 25. What does chemical kinetics study? A) The structure of molecules. B) The rates of chemical reactions. C) The properties of elements. D) The formation of compounds. Show Answer Correct Answer: B) The rates of chemical 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