This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics – Quiz 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 7 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the significance of the order of a reaction? A) It determines the temperature at which the reaction occurs. B) It indicates how the rate is affected by the concentration of reactants. C) It specifies the physical state of the reactants involved. D) It defines the activation energy required for the reaction. Show Answer Correct Answer: B) It indicates how the rate is affected by the concentration of reactants. 2. What happen in a steady state? A) Product is being formed faster than reactants regenerated. B) Heat is evolved. C) Concentration of an intermediate is constant. D) Nothing is happening. Show Answer Correct Answer: C) Concentration of an intermediate is constant. 3. A reaction has a rate law expressed as $\text{Rate} = k[\text{A}]^2[\text{B}]$ A) First-order. B) Second-order. C) Third-order. D) Zero-order. Show Answer Correct Answer: C) Third-order. 4. True or False:All collisions of molecules result in chemical change. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 5. Given the following rate law, rate = k[A]$^{2}$[B]if [A] were doubled, what must happen to [B] to keep the rate constant? A) Must tripled. B) Must double. C) Must be havled. D) Must be quartered. Show Answer Correct Answer: D) Must be quartered. 6. Identify the order of reaction from the following unit for its rate constant:L mol$^{-1}$s$^{-1}$ A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: B) 2. 7. What is the effect of increasing temperature on reaction rates? A) Increasing temperature decreases reaction rates by reducing energy to the reactants. B) Increasing temperature generally increases reaction rates by providing more energy to the reactants. C) Increasing temperature has no effect on reaction rates. D) Increasing temperature only affects reaction rates in gaseous reactions. Show Answer Correct Answer: B) Increasing temperature generally increases reaction rates by providing more energy to the reactants. 8. Which of the following statements about the rate of a chemical reaction is true? A) The rate is independent of temperature. B) The rate is directly proportional to the concentration of reactants. C) The rate is inversely proportional to the surface area of reactants. D) The rate is unaffected by the presence of a catalyst. Show Answer Correct Answer: B) The rate is directly proportional to the concentration of reactants. 9. Temperature coefficient = A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: B) 2. 10. An activated complex is a chemical species that is A. Stable and has low PE.B. Stable and has high PE.C. Unstable and has low PE.D. Unstable and has high PE. A) A. B) B. C) C. D) D. Show Answer Correct Answer: D) D. 11. Catalyst Helps in attaining the equilibrium faster, A) TRUE. B) FALSE. C) All the above. D) None of the above. Show Answer Correct Answer: A) TRUE. 12. The rate constant of a reaction depends on A) Temperature. B) Reactant concentration. C) Presence of catalyst. D) All of the above. Show Answer Correct Answer: A) Temperature. 13. How is reaction rate typically expressed in terms of the change in concentration of reactants or products over time? A) Change in volume over time. B) Change in pressure over time. C) Change in temperature over time. D) Change in concentration of reactants or products over time. Show Answer Correct Answer: D) Change in concentration of reactants or products over time. 14. What does the symbol 'k' represent in a rate law? A) 'k' is the rate constant, which is specific to a particular reaction at a given temperature. B) 'k' represents the equilibrium constant for a reaction. C) 'k' indicates the reaction order in a rate law. D) 'k' is a variable representing the concentration of reactants. Show Answer Correct Answer: A) 'k' is the rate constant, which is specific to a particular reaction at a given temperature. 15. What is the half-life (t$_{1/2}$) of a reactant with a decay constant $\left(\lambda\right)$ A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: A) 1. 16. The slowest step in a reaction mechanism determines the: A) Overall rate of reaction. B) Activation energy. C) Products formed. D) Reaction order. Show Answer Correct Answer: A) Overall rate of reaction. 17. If a data set (Concentration-Time) that follows zero-order kinetics is plotted on a semi log graph paper. Theoretically, what would the shape of the plot be? A) Convex. B) Concave. C) Linear. D) None of the above. Show Answer Correct Answer: A) Convex. 18. Overall reaction order can be determined how? A) Adding the powers to which reactant concentrations are raised in the rate law. B) Multiplying the powers to which reactant concentrations are raised in the rate law. C) Subtracting the powers to which reactant concentrations are raised in the rate law. D) Dividing the powers to which reactant concentrations are raised in the rate law. Show Answer Correct Answer: A) Adding the powers to which reactant concentrations are raised in the rate law. 19. According to collision theory, which of the following factors affects the rate of reaction? A) Concentration of reactants. B) Temperature. C) Presence of a catalyst. D) All of the above. Show Answer Correct Answer: D) All of the above. 20. A catalyst A) Changes the free energy change of a reaction. B) Is included in the balanced chemical equation for a reaction. C) Changes the mechanisms for a reaction. D) Slows down the rate of a reaction. Show Answer Correct Answer: C) Changes the mechanisms for a reaction. 21. On a Maxwell-Boltzmann distribution curve, a suitable label for the y-axis is A) Fraction of particles with Kinetic Energy (E). B) Kinetic Energy (E). C) Activation Energy (Ea). D) Enthalpy. Show Answer Correct Answer: A) Fraction of particles with Kinetic Energy (E). 22. Which of these changes with time for a first-order reaction? A. Rate of reactionB. Rate constantC. Half-life A) A only. B) B only. C) A & C only. D) A & B only. Show Answer Correct Answer: A) A only. 23. In an experiment, the decomposition of hydrogen peroxide is catalyzed by manganese dioxide. What role does manganese dioxide play in this reaction? A) It increases the activation energy required for the reaction. B) It decreases the rate of reaction. C) It acts as a reactant in the reaction. D) It provides an alternative pathway with a lower activation energy. Show Answer Correct Answer: D) It provides an alternative pathway with a lower activation energy. 24. In pseudo unimolecular reactions A) Both the reactants are present in low concentration. B) Both the reactants are present in same concentration. C) One of the reactant is present in excess. D) One of the reactant is non-reactive. Show Answer Correct Answer: C) One of the reactant is present in excess. 25. Define a zero order reaction and provide an example. A) The decomposition of nitrous oxide (N2O) on a hot platinum surface. B) The synthesis of ammonia from nitrogen and hydrogen. C) The reaction of hydrogen and oxygen to form water. D) The combustion of methane in oxygen. Show Answer Correct Answer: A) The decomposition of nitrous oxide (N2O) on a hot platinum surface. ← 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 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