This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics – Quiz 14 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 14 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Catalyst does not change the ..... A) Equilibrium speed. B) Speed. C) Equilibrium constant. D) Rate. Show Answer Correct Answer: C) Equilibrium constant. 2. Which of the following statements is true about a catalyst in a chemical reaction? A) It increases the activation energy of the reaction. B) It is consumed in the reaction. C) It changes the equilibrium position of the reaction. D) It provides an alternative pathway with lower activation energy. Show Answer Correct Answer: D) It provides an alternative pathway with lower activation energy. 3. If the temperature of a reaction is increased from 300K to 310K and the rate doubles, the activation energy of the reaction is approximately A) 52 kJ/mol. B) 62 kJ/mol. C) 100 kJ/mol. D) 65 kJ/mol. Show Answer Correct Answer: A) 52 kJ/mol. 4. Rate of reaction increase with increase in concntration A) NO. B) Yes. C) All the above. D) None of the above. Show Answer Correct Answer: B) Yes. 5. What is the term for the energy required to initiate a reaction? A) Potential energy. B) Kinetic energy. C) Thermodynamic energy. D) Activation energy. Show Answer Correct Answer: D) Activation energy. 6. What is a pseudo-rate law? A) A rate law that is false. B) A rate law that is result of the simplification of a more complex rate law. C) A rate law that is incomplete, due to lacking orders. D) A rate law that represents the abstract concept of rate laws (Rate = k[A][B]), without specific reactants or orders. E) A rate law that does not have any variables calculated. Show Answer Correct Answer: B) A rate law that is result of the simplification of a more complex rate law. 7. For an overall reaction order of 1, what will rate constant "k" have for its units? A) 1/s or s $^{-1}$. B) M/s or M x s$^{-1}$. C) 1/Mxs or M$^{-1 }$x s$^{-1}$. D) 1/M2 x s or M$^{-2}$ x s$^{-1}$. Show Answer Correct Answer: A) 1/s or s $^{-1}$. 8. Decreasing the concentration of a substance will usually ..... A) Slow down the reaction. B) Speed up the reaction. C) Have no affect on the reaction. D) None of the above. Show Answer Correct Answer: A) Slow down the reaction. 9. Write the rate law for the reaction aA $\rightarrow$ bB if the reaction is third order in A. [B] is not part of the rate law. A) Rate =k[A]. B) Rate =3[A]. C) Rate =k[3A]. D) Rate =k[A]$^{3}$. Show Answer Correct Answer: D) Rate =k[A]$^{3}$. 10. Name the compound, N$_{2}$O$_{5}$ A) Nitrogen Pentoxide. B) Dinitrogen (V) oxide. C) Dinitrogen Pentoxide. D) Dinitrogen Oxide. Show Answer Correct Answer: C) Dinitrogen Pentoxide. 11. Consider a reaction aG + bH $\rightarrow$ Products. Whenconcentration of both the reactants G and H is doubled, the rate increases by eight times. However, whenconcentration of G is doubled keeping the concentrationof H fixed, the rate is doubled. The overall order of thereaction is: A) 0. B) 1. C) 2. D) 3. Show Answer Correct Answer: D) 3. 12. Rate = k[A]The rate constant in the rate law above is 0.5 L/mols. If the initial concentration of A is 0.1 M, how long will it take for [A] to drop to 0.025 M? A) 0.7 s. B) 1.4 s. C) 2.8 s. D) There is not enough information given. Show Answer Correct Answer: C) 2.8 s. 13. How can the rate law of a chemical reaction be determined experimentally? A) By guessing based on intuition. B) By flipping a coin. C) By asking a magic eight ball. D) By conducting experiments with varying reactant concentrations and analyzing the data obtained. Show Answer Correct Answer: D) By conducting experiments with varying reactant concentrations and analyzing the data obtained. 14. For a first-order reaction with a rate constant k=0.693 min$^{-1}$, what is its half-life? A) 1min. B) 2min. C) 3min. D) 4min. Show Answer Correct Answer: A) 1min. 15. The half-life period of a first-order process A) Depends on reactant concentration raised to the first power. B) Is inversely proportional to square of reactant concentration. C) Is inversely proportional to reactant concentration. D) Is totally independent of reactant concentration. Show Answer Correct Answer: D) Is totally independent of reactant concentration. 16. The rate law for a reaction is rate = k [A][B]2 Which one of the following statements is false? A) If [B] is doubled, the reaction rate will increase by a factor of 4. B) The reaction is second order in B. C) The reaction is first order in A. D) The reaction is second order overall. Show Answer Correct Answer: D) The reaction is second order overall. 17. The collision frequency increases when: A) Temperature increases. B) Reactant concentration increases. C) Both (A) and (B). D) None. Show Answer Correct Answer: C) Both (A) and (B). 18. Pseudo zero order depends on: A) ONCE CONCENTRATION THAT IS VERY HIGH OR CONSTANT. B) RATE CONSTANT DOES NOT DEPEND ON CONCENTRATION. C) RATE DOES NOT CHANGE WITH CONCENTRATION. D) None of the above. Show Answer Correct Answer: A) ONCE CONCENTRATION THAT IS VERY HIGH OR CONSTANT. 19. What is the significance of the rate constant in a rate law? A) The rate constant indicates the speed of a reaction and its dependence on temperature and activation energy. B) The rate constant determines the final products of a reaction. C) The rate constant measures the concentration of reactants. D) The rate constant is only relevant at equilibrium. Show Answer Correct Answer: A) The rate constant indicates the speed of a reaction and its dependence on temperature and activation energy. 20. Which of the following is expressions represents correctly rate of following reaction?X + Y $\rightarrow$ Z + Q $\Delta$H = +22kj/mol A) Rate = +$\Delta$[X] / $\Delta$t. B) Rate = +$\Delta$[Y] / $\Delta$t. C) Rate = +$\Delta$[Z] / $\Delta$t. D) Rate =-$\Delta$[Q] / $\Delta$t. Show Answer Correct Answer: C) Rate = +$\Delta$[Z] / $\Delta$t. 21. A reaction is most likely to occur when the colliding particles have proper orientation and A) Mass. B) Volume. C) Half-life. D) Energy. Show Answer Correct Answer: D) Energy. 22. How much energy is released when two moles of methane (CH$_{4}$) reacts at 298 K and 101.3 kPa according to the following equation:CH$_{4}$(g) + 2O$_{2}$(g) $\rightarrow$ CO$_{2}$(g) + 2H$_{2}$O(l) A) 890.4 J. B) 890.4 kJ. C) 1780.4 J. D) 1780.4 kJ. Show Answer Correct Answer: D) 1780.4 kJ. 23. For a second-order reaction, what is the unit of the rate of the reaction? A) S$^{-1}$. B) Mol L$^{-1}$s$^{-1}$. C) Mol$^{-1}$ L s$^{-1}$. D) Mol$^{-2}$ L$^{2}$ s$^{-1}$. Show Answer Correct Answer: C) Mol$^{-1}$ L s$^{-1}$. 24. The half-life of a first-order reaction is independent of: A) Temperature. B) Activation energy. C) Initial concentration. D) Reaction mechanism. Show Answer Correct Answer: C) Initial concentration. 25. Given:A + 3B $\rightarrow$ 2C + DThis reaction is first order with respect to reactant A and second order with respect to reactant B. If the concentration of A is doubled and the concentration of B is halved, the rate of the reaction would ..... by a factor of ..... A) Increase, 2. B) Decrease, 2. C) Increase, 4. D) Decrease, 4. E) Not change. Show Answer Correct Answer: B) Decrease, 2. ← 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