This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics – Quiz 8 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 8 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. How do you calculate the half-life of a first order reaction? A) T1/2 = k/0.693. B) T1/2 = 1/k. C) T1/2 = 2.303/k. D) T1/2 = 0.693/k. Show Answer Correct Answer: D) T1/2 = 0.693/k. 2. Which of these conditions exist at equilibrium? A) The forward reaction happens faster than the reverse reaction. B) The forward reaction happens slower than the reverse reaction. C) The forward reaction and the reverse reaction happen at the same rate. D) The forward reaction has stopped. Show Answer Correct Answer: C) The forward reaction and the reverse reaction happen at the same rate. 3. A catalyst does not alter ..... A) SPEED. B) RATE. C) DELTA G. D) ALL OF THESE. Show Answer Correct Answer: C) DELTA G. 4. Chemical kinetics can also be used to find out about reaction mechanisms and transition states. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 5. Which is an appropriate unit for the rate of a reaction? A) Mol dm$^{-3}$ s. B) Mol dm$^{-3}$ s$^{-1}$. C) Mol dm$^{-3}$. D) S. Show Answer Correct Answer: B) Mol dm$^{-3}$ s$^{-1}$. 6. Species that are form in one step of reaction mechanism and used up in another step are called A) Catalyst. B) Intermediate. C) Inhibitors. D) Activated complex. Show Answer Correct Answer: B) Intermediate. 7. What are the two criteria for a collision to be effective? A) Proper orientation and particle size. B) Enough energy to overcome the activation energy and proper orientation. C) Enough energy to overcome the activation energy and homogeneity. D) Proper orientation and heterogeneity. Show Answer Correct Answer: B) Enough energy to overcome the activation energy and proper orientation. 8. Catalysts are agents that increase reaction rates without themselves being used up. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 9. Which factors affect the rate of a reaction? A) Temperature, pressure and humidity. B) Temperature, reactant concentration and catalyst. C) Temperature, reactant concentration and pressure. D) Temperature, product concentration and container volume. Show Answer Correct Answer: B) Temperature, reactant concentration and catalyst. 10. Which of the following expressions is the accurate depiction of the rate degradation of tetracycline?Tetraciclyne (Tet) Kf /Kr Epianhydrotetracycline A) -d[Tet]/dt = Kf[Ted]-Kr[Epi]. B) -d[Tet]/dt = Kf[Ted] + Kr[Epi]. C) D[Tet]/dt = Kf[Ted]-Kr[Epi]. D) -d[Tet]/dt = Kr[Ted]-Kf[Epi]. Show Answer Correct Answer: A) -d[Tet]/dt = Kf[Ted]-Kr[Epi]. 11. Noah is conducting an experiment where the rate law is $k[A]^2[B]$ A) There are two molecules of A in the balanced equation. B) The reaction is second order overall. C) The rate is doubled when [A] is doubled. D) The rate quadruples when [A] is doubled. Show Answer Correct Answer: D) The rate quadruples when [A] is doubled. 12. Which of the following is a condition for effective collisions to occur? A) Particles should have enough energy. B) Particles should be correctly oriented. C) Both answers are correct. D) None of the above. Show Answer Correct Answer: C) Both answers are correct. 13. The reaction rate is defined as the rate at which the concentration of the reactants ..... with time or the concentration of products ..... with time. A) Increase, increase. B) Decrease, decrease. C) Decrease, increase. D) Increase, decrease. Show Answer Correct Answer: C) Decrease, increase. 14. The order of a reaction may be(choose the best option) A) 0. B) 0, 1. C) 0, 1, 2, 3. D) 0, 1, 2, 3 and even fraction. Show Answer Correct Answer: D) 0, 1, 2, 3 and even fraction. 15. A solution that is in equilibrium with undissolved solute is saturated. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 16. In a reaction if the concentration of reactant A is tripled, the rate of reaction becomes twenty seven times. What is the order of the reaction? A) 0. B) 1. C) 2. D) 3. Show Answer Correct Answer: D) 3. 17. A reaction between an acid and a metal carbonate takes 60 seconds before it iscompleted. Why is the initial rate of the reaction faster than the rate after 50 seconds? A) The concentration of the acid decreases during the reaction. B) The temperature of the reaction decreases as it proceeds. C) The particle size of the metal carbonate decreases as the reaction proceeds. D) The carbon dioxide produced dissolves in the water as the reaction proceeds. Show Answer Correct Answer: A) The concentration of the acid decreases during the reaction. 18. The following is true for reaction mechanism EXCEPT A) Elementary steps must add up to overall balanced equation. B) Molecularity for slow and fast step is 2. C) Proposed mechanism is likely. D) Slow step and fast step dont add up to overall balanced eqn. Show Answer Correct Answer: D) Slow step and fast step dont add up to overall balanced eqn. 19. For a chemical reaction A$\rightarrow$B, it is found that the rate of reaction doubles when the concentration of A is increased four times. The order of reaction is A) Two. B) One. C) Half. D) Zero. Show Answer Correct Answer: C) Half. 20. How can you determine the order of a reaction experimentally? A) Observe the color change of the solution. B) Count the number of moles of reactants used. C) Measure the temperature change during the reaction. D) Use the method of initial rates or integrated rate laws to analyze how reaction rate changes with concentration. Show Answer Correct Answer: D) Use the method of initial rates or integrated rate laws to analyze how reaction rate changes with concentration. 21. In a consecutive or series reaction, the rate of formation of B is expressed as A) DB/dt=K1[A]-k2[B]. B) DB/dt=K1[B]-k2[A]. C) -dB/dt=K1[A]-k2[B]. D) DB/dt=K2[B]-k1[A]. Show Answer Correct Answer: A) DB/dt=K1[A]-k2[B]. 22. The conversion of molecules X to Y follows 2nd order kinetics. If concentration of X is increased 3 times, how will it affect the rate of formation of Y A) 3 times. B) 6 times. C) 9 times. D) 8 times. Show Answer Correct Answer: C) 9 times. 23. What is the relationship between the rate of a reaction and the concentration of reactants? A) The rate is independent of the concentration of reactants. B) The rate increases as the concentration of reactants decreases. C) The rate is proportional to the concentration of reactants raised to a power. D) The rate is only affected by temperature, not concentration. Show Answer Correct Answer: C) The rate is proportional to the concentration of reactants raised to a power. 24. Which can be determined graphically and at any time A) Average rate. B) Instantaneous rate. C) Slow rate. D) Fast rate. Show Answer Correct Answer: B) Instantaneous rate. 25. On which factor the rate constant of a reaction does not depend upon? a) Temperature b) Activation energy c) Time d) Concentration of reactants and products A) C, D. B) A, D. C) B, D. D) A, B, C. Show Answer Correct Answer: A) C, 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 9Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 10Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books