This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics – Quiz 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 2 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. An ice cube melts into liquid water. This is an ..... A) Exothermic reaction. B) Endothermic reaction. C) All the above. D) None of the above. Show Answer Correct Answer: B) Endothermic reaction. 2. An ion-dipole force exists between an ion and a non-polar molecule. Cations are attracted to the negative end of a dipole, and anions are attracted to the positive end. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 3. The rate of a chemical reaction tells us about A) The reactants taking part in the reaction t. B) The products formed in the reaction. C) How slow or fast the reaction is taking place. D) None of the above. Show Answer Correct Answer: C) How slow or fast the reaction is taking place. 4. Which of the following affect the rate of the reaction as nature of the reactant A) Physical size of the reactant. B) Ionic or covalent substances. C) Both 1 and 2. D) None. Show Answer Correct Answer: C) Both 1 and 2. 5. What does the Arrhenius equation relate to? A) Concentration and time. B) Pressure and volume. C) Energy and mass. D) Rate of reaction and temperature. Show Answer Correct Answer: D) Rate of reaction and temperature. 6. True or False:David is conducting an experiment and writes the balanced chemical equation for his reaction. He wonders if he can determine the rate law directly from this equation. Is it true that rate laws are determined directly from the balanced chemical equation? A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 7. Activation energy is the ..... energy required to start a chemical rection A) Maxmimum. B) Minimum. C) All the above. D) None of the above. Show Answer Correct Answer: B) Minimum. 8. What does the rate of a reaction depend on? A) Only temperature. B) Only concentration. C) Only catalysts. D) Concentration, temperature, and catalysts. Show Answer Correct Answer: D) Concentration, temperature, and catalysts. 9. A chemical reaction occurs when reactant particles A) Are separated by great distances. B) Have no attractive forces between them. C) Collide with proper energy and proper orientation. D) Convert chemical energy into nuclear energy. Show Answer Correct Answer: C) Collide with proper energy and proper orientation. 10. What is the molecularity of a reaction? A) The number of molecules involved in an elementary reaction. B) The number of steps in a reaction. C) The total concentration of reactants. D) The rate of formation of products. Show Answer Correct Answer: A) The number of molecules involved in an elementary reaction. 11. How do you determine the order of a reaction experimentally? A) The order of a reaction is determined by the temperature alone. B) The order of a reaction is always equal to the stoichiometric coefficients of the reactants. C) The order of a reaction can be determined by analyzing the relationship between reactant concentrations and reaction rates. D) The order of a reaction can be found by measuring the volume of gas produced. Show Answer Correct Answer: C) The order of a reaction can be determined by analyzing the relationship between reactant concentrations and reaction rates. 12. How does surface area affect reaction rates? A) Increasing surface area allows more collisions between reactants, thus increasing the reaction rate. B) Decreasing surface area reduces the number of collisions, slowing down the reaction rate. C) Surface area has no effect on reaction rates; only temperature matters. D) Increasing surface area decreases the reaction rate by spreading reactants too thin. Show Answer Correct Answer: A) Increasing surface area allows more collisions between reactants, thus increasing the reaction rate. 13. Which of these will NOT speed up the rate of reaction between a strip of magnesium and hydrochloric acid? A) Tightly coil up the strip of magnesium. B) Cut up the strip of magnesium. C) Increase the concentration of the hydrocholoric acid. D) Increase the temperature of the hydrocholoric acid. Show Answer Correct Answer: A) Tightly coil up the strip of magnesium. 14. According to the results of Experiment 1, for any given catalyst, as the temperature was increased, the number of cycles needed to complete the reaction: A) Increased only. B) Decreased only. C) Increased, then decreased. D) Decreased, then increased. Show Answer Correct Answer: A) Increased only. 15. The pulverizing of a solid substances to increase reaction rate effective because pulverizing A) Increases the temperature. B) Increases the surface area. C) Reduces the bonding forces between molecules. D) Changes the chemical make-up of the reacting substances. Show Answer Correct Answer: B) Increases the surface area. 16. Step 1:O$_{3}$ $\rightarrow$ O$_{2}$ + Ostep 2:O$_{3}$ + O $\rightarrow$ 2 O$_{2}$The oxygen atom (O) is considered to be a(n) ..... $_{}$ A) Reactant. B) Catalyst. C) Reaction intermediate. D) Activated complex. Show Answer Correct Answer: C) Reaction intermediate. 17. Half-life of a pseudo zero-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. 18. Imagine Jackson is conducting a chemical experiment in his lab. He decides to increase the concentration of a reactant. What happens to the equilibrium position of the reaction? A) It shifts towards the products. B) It shifts towards the reactants. C) It remains unchanged. D) The reaction stops. Show Answer Correct Answer: A) It shifts towards the products. 19. Explain the difference between reaction rate and rate constant. A) The rate constant changes with temperature, while reaction rate does not. B) Reaction rate is a fixed value, whereas the rate constant varies with time. C) Reaction rate is the same as the rate constant. D) Reaction rate measures how fast a reaction occurs, while the rate constant is a specific value that relates the reaction rate to reactant concentrations. Show Answer Correct Answer: D) Reaction rate measures how fast a reaction occurs, while the rate constant is a specific value that relates the reaction rate to reactant concentrations. 20. An EXOthermic reaction will have a postive or negative $\Delta H$ A) $+\\Delta H$. B) $-\\Delta H$. C) All the above. D) None of the above. Show Answer Correct Answer: B) $-\\Delta H$. 21. What is the effect of concentration on the rate of a zero order reaction? A) The rate increases with higher concentration. B) The rate is directly proportional to concentration. C) The rate of a zero order reaction is unaffected by concentration. D) The rate decreases with higher concentration. Show Answer Correct Answer: C) The rate of a zero order reaction is unaffected by concentration. 22. For the reaction, NO$_{2}$ (g) + CO (g) $\rightarrow$ NO (g) +CO$_{2}$ (g), the correct expression for the rate of reaction is A) Rate =-d[NO$_{2}$]/dt. B) Rate =-d[CO$_{2}$]/dt. C) Rate = d[CO]/dt. D) Rate = \{d[NO$_{2}$]-d[CO]\}/dt. Show Answer Correct Answer: A) Rate =-d[NO$_{2}$]/dt. 23. Which of the following statements is correct? a The rate of a reaction decreases with passage of time as the concentration of reactants decreases.b The rate of a reaction is same at any time during the reaction. c The rate of a reaction is independent of temperature change. d The rate of a reaction decreases with increase in concentration of reactant(s). A) A. B) B. C) C. D) D. Show Answer Correct Answer: A) A. 24. A drug solution decomposes with a rate constant, k, of 0.0077 days-1. What is the half-life of the drug in solution? A) 90 days. B) 90 hours. C) 9 days. D) 5 hours. Show Answer Correct Answer: A) 90 days. 25. Rate law of a composite reaction is determined by a slowest step which is known as ..... A) Rate determining step. B) Non determining step. C) Fastest step. D) Independent. Show Answer Correct Answer: A) Rate determining step. ← PreviousNext →Related QuizzesClass 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 1Class 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 10Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books