This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 1 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the half-life of a zero order reaction? A) T1/2 = k / [A]0. B) T1/2 = [A]0 / (2k). C) T1/2 = 1 / (k[A]0). D) T1/2 = [A]0 / k. Show Answer Correct Answer: B) T1/2 = [A]0 / (2k). 2. Define the term 'reaction rate' in the context of chemical kinetics. A) The reaction rate is the amount of time it takes for a reaction to complete. B) The reaction rate is the total energy released during a reaction. C) The reaction rate is the speed of a chemical reaction, defined as the change in concentration of reactants or products over time. D) The reaction rate is the temperature of a chemical reaction. Show Answer Correct Answer: C) The reaction rate is the speed of a chemical reaction, defined as the change in concentration of reactants or products over time. 3. What happened to the rate of reaction, if concentration of reactant is 'zero order'. A) Rate of reaction will become double. B) Rate of reaction will become triple. C) Rate of reaction will become quadrapel. D) No affect to the rate of reaction. Show Answer Correct Answer: D) No affect to the rate of reaction. 4. Rate law for the reaction A+2B $\rightarrow$C is found to be Rate = K[A][B]Concentration of reactant 'B' is doubled keeping the concentration of 'A' constant, the value of rate constant will be ..... A) The same. B) Doubled. C) Quadrupled. D) Halved. Show Answer Correct Answer: A) The same. 5. Which equals the heat of reaction? A) Potential energy of the products plus potential energy of the reactants. B) Potential energy of the products minus potential energy of the reactants. C) Potential energy of the reactants plus potential energy of the products. D) Potential energy of the reactants plus potential energy of the products. Show Answer Correct Answer: B) Potential energy of the products minus potential energy of the reactants. 6. Which of the following changes that can be made to a chemical reaction will result in a greater proportion of successful collisions between reactant particles?I. addition of a catalystII. grinding reactant lumps into a powderIII. increasing the concentration of reactants A) I only. B) II and III only. C) I and II only. D) I, II and III. Show Answer Correct Answer: A) I only. 7. What is the effect of a catalyst on a chemical reaction? A) Increases activation energy. B) Decreases activation energy. C) Changes the equilibrium constant. D) Increases the temperature. Show Answer Correct Answer: B) Decreases activation energy. 8. According to the collision theory, for a reaction to occur: A) Reacting molecules must collide with sufficient energy and proper orientation. B) Reacting molecules must collide with low energy. C) The reaction must be exothermic. D) The reaction must be endothermic. Show Answer Correct Answer: A) Reacting molecules must collide with sufficient energy and proper orientation. 9. What is the effect of adding catalyst on the free energy change deltsG of a reaction A) Gibbs free energy increases. B) Gibbs free energy decreases. C) Gibbs free energy remains constant. D) None of these. Show Answer Correct Answer: C) Gibbs free energy remains constant. 10. How does pressure affect reaction rate? A) Increased pressure increases reaction rate because particles collide more frequently. B) Increased pressure increases reaction rate because particles collide less frequently. C) Decreased pressure increases reaction rate because particles collide more frequently. D) Decreased pressure increases reaction rate because particles collide less frequently. Show Answer Correct Answer: A) Increased pressure increases reaction rate because particles collide more frequently. 11. The rate constant of a reaction is 5.8 $\times$ A) 0$^{th}$ order. B) 1$^{st}$ order. C) 2$^{nd}$ order. D) 3$^{rd}$ order. Show Answer Correct Answer: C) 2$^{nd}$ order. 12. A reaction with a negative activation energy suggests: A) Spontaneous reaction. B) Endothermic reaction. C) A complex mechanism. D) Unusual behavior. Show Answer Correct Answer: D) Unusual behavior. 13. Which conditions will increase the rate of a chemical reaction? A) Decreased temperature and decreased concentration of reactants. B) Decreased temperature and increased concentration of reactants. C) Increased temperature and decreased concentration of reactants. D) Increased temperature and increased concentration of reactants. Show Answer Correct Answer: D) Increased temperature and increased concentration of reactants. 14. Consider the following mechanism. Step 1:O$_{3}$ $\rightarrow$ O$_{2}$ + O (fast)Step 2:O$_{3}$ + O $\rightarrow$ 2 O$_{2}$ (slow)What is the overall balanced equation? A) 4 O$_{3}$ $\rightarrow$ 3 O$_{2}$. B) O$_{3}$ $\rightarrow$ 3 O$_{2}$. C) 3 O$_{3}$ $\rightarrow$ 2 O$_{2}$. D) 2 O$_{3}$ $\rightarrow$ 3 O$_{2}$. Show Answer Correct Answer: D) 2 O$_{3}$ $\rightarrow$ 3 O$_{2}$. 15. What is dynamic equilibrium in the context of chemical kinetics? A) Dynamic equilibrium is the state where the rates of forward and reverse reactions are equal, leading to constant concentrations of reactants and products. B) Dynamic equilibrium occurs only at high temperatures. C) Dynamic equilibrium is when reactants are completely converted to products. D) Dynamic equilibrium is the point where no reactions occur. Show Answer Correct Answer: A) Dynamic equilibrium is the state where the rates of forward and reverse reactions are equal, leading to constant concentrations of reactants and products. 16. Which of the following factors does NOT affect the rate of a chemical reaction? A) Temperature. B) Concentration of reactants. C) Presence of a catalyst. D) Color of reactants. Show Answer Correct Answer: D) Color of reactants. 17. What would be my the overall order of this rate law? Rate=[A]$^{2}$[B]$^{1}$ A) 0 Order. B) 1st Order. C) 2nd Order. D) 3rd Order. Show Answer Correct Answer: D) 3rd Order. 18. Which of the options below does NOT affect the rate of a reaction? A) Concentration. B) Temperature. C) Time. D) Catalyst. Show Answer Correct Answer: C) Time. 19. Bimolecular means: A) 2 molecules react. B) 3 molecules react. C) 1 molecule reacts. D) None of the above. Show Answer Correct Answer: A) 2 molecules react. 20. The sun undergoes fusion reactions to produce light, this is an ..... A) Exothermic Reaction. B) Endothermic Reaction. C) All the above. D) None of the above. Show Answer Correct Answer: A) Exothermic Reaction. 21. Time required for 100% completion of a zero order reaction is if initial concentration is [R]$_{0}$ A) 2K/[R]$_{0}$. B) [R]$_{0/2K}$. C) [R]$_{0/K}$. D) [R]$_{0 K}$. Show Answer Correct Answer: C) [R]$_{0/K}$. 22. Explain the concept of rate-determining step in a chemical reaction. A) Rate-determining step in a chemical reaction is the slowest step that determines the overall rate of the reaction. B) Rate-determining step is the fastest step in a reaction. C) Rate-determining step occurs after the reaction is completed. D) Rate-determining step has no impact on the overall rate of the reaction. Show Answer Correct Answer: A) Rate-determining step in a chemical reaction is the slowest step that determines the overall rate of the reaction. 23. HI dissociates to form I$_{2}$ and H$_{2}$:2HI(g) $\rightarrow$ H$_{2}$(g) + I$_{2}$(g) If the concentration of HI changes at a rate of-0.50 M/s, what is the rate of appearance of H$_{2}$(g)? A) .25 M/s. B) .10 M/s. C) 1.0 M/s. D) The rate of appearance and disappearance are the same. Show Answer Correct Answer: A) .25 M/s. 24. Products will form faster if ..... A) The particle size of the reactants are larger. B) Temperature is decreased. C) Concentration of the reactants are increased. D) The reaction is not stirred. Show Answer Correct Answer: C) Concentration of the reactants are increased. 25. Zero order rate constant DOES NOT DEPEND ON CONCENTRATION A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. Next →Related QuizzesClass 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 10Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books