This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics – Quiz 16 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 16 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Describe a first-order reaction with an example. A) The reaction of sodium bicarbonate (NaHCO3) with acetic acid (CH3COOH) is first-order. B) The combustion of methane (CH4) in oxygen (O2) is a first-order reaction. C) The synthesis of ammonia (NH3) from nitrogen (N2) and hydrogen (H2) is a first-order reaction. D) An example of a first-order reaction is the decomposition of hydrogen peroxide (H2O2) into water (H2O) and oxygen (O2). Show Answer Correct Answer: D) An example of a first-order reaction is the decomposition of hydrogen peroxide (H2O2) into water (H2O) and oxygen (O2). 2. A given sample of milk turns sour at room temperature (27$^{0}$C) in 5hours. In a refrigerator at-3$^{0}$C, it can be stored 10 times longer. The energy of activation for the souring of milk is: A) 2.303 $\times$. B) 2.303 $\times$. C) 2.303 $\times$. D) 2.303 $\times$. Show Answer Correct Answer: A) 2.303 $\times$. 3. When it is necessary and required to obtain the value of an intercept form the graph of a straight-line equation, one may use two different available approaches. Each approach however, requires knowledge of the slope of the graph. Slope or intercepts A) FALSE. B) TRUE. C) All the above. D) None of the above. Show Answer Correct Answer: A) FALSE. 4. With the increase in temperature, the average kinetic energy of the molecules increases, leading to a decrease in number of collisions per unit time. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 5. If the rate of the reaction is equal to the rate constant, then the order of the reaction is A) 3. B) 0. C) 1. D) 2. Show Answer Correct Answer: B) 0. 6. On a maxwell-Boltzmann distribution curve, what would be a suitable x-axis label? A) Potential Energy. B) Kinetic Energy. C) Activation Energy. D) Temperature. Show Answer Correct Answer: B) Kinetic Energy. 7. A liquid medicine having an initial drug concentration of 1000 mg/ml undergoes zero-order kinetics with a rate constant of 100 mg/ml per day. How long it would take before the product is completely degraded. A) 10 days. B) 10 hours. C) 100 days. D) 1000 hours. Show Answer Correct Answer: A) 10 days. 8. What is the sign of $\Delta$H for all endothermic reactions? A) Positive. B) Negative. C) All the above. D) None of the above. Show Answer Correct Answer: A) Positive. 9. Which of the following best describes the role of a catalyst in a chemical reaction? A) It increases the activation energy, thereby increasing the reaction rate. B) It provides an alternative reaction pathway with a lower activation energy. C) It increases the equilibrium constant of the reaction. D) It gets consumed in the reaction and does not regenerate. Show Answer Correct Answer: B) It provides an alternative reaction pathway with a lower activation energy. 10. If C$_{0}$ is the initialconcentration then the half life period (t$_{1/2}$) for the third order kinetics is ..... A) T$_{1/2}$ = 1/kC$_{0}$. B) T$_{1/2}$ = 3/2kC$_{0}$$^{2}$. C) T$_{1/2}$ = 3k/2C$_{0}$$^{2}$. D) T$_{1/2}$ = 3/2kC$_{0}$. Show Answer Correct Answer: B) T$_{1/2}$ = 3/2kC$_{0}$$^{2}$. 11. If concentration of reactant 'A' is increased 10 times and the rate of reaction becomes 100 times. What is the order with respect to 'A'? A) 1. B) 2. C) 3. D) 4. Show Answer Correct Answer: B) 2. 12. Sophia, Abigail, and Oliver are conducting a chemistry experiment. They are observing how the reaction rates change. According to their observations, what can change the reaction rates? A) Changing the temperature of the experiment. B) Adding a catalyst to the experiment. C) Altering the concentration of the reactants. D) All of the above changes. Show Answer Correct Answer: D) All of the above changes. 13. The time required for 100% completion of a zero order reaction is A) [R$_{0}$]/2k. B) [R$_{0}$]k. C) 2k/[R$_{0}$]. D) [R$_{0}$]/k. Show Answer Correct Answer: D) [R$_{0}$]/k. 14. ..... reactions are those which are completed in more than one steps A) Simple. B) Parallel. C) Composite. D) All the above. Show Answer Correct Answer: C) Composite. 15. For the reaction A + 3B $\rightarrow$ 2C, how does the rate of disappearance of B compare to the rate of production of C? A) The rate of disappearance of B is 3/2 the rate of appearance of C. B) The rate of disappearance of B is 1/2 the rate of appearance of C. C) The rate of disappearance of B is twice the rate of appearance of C. D) The rate of disappearance of B is the same as the rate of appearance of C. Show Answer Correct Answer: A) The rate of disappearance of B is 3/2 the rate of appearance of C. 16. The role of a catalyst is to change ..... a) a. Gibbs energy of reaction. b) b. Enthalpy of reaction.c) c. Activation energy of reaction. d) d. Equilibrium constant A) A. B) B. C) C. D) D. Show Answer Correct Answer: C) C. 17. Which of the following represents the the unit of k in first order reaction? A) $s^{-1}$. B) $s$. C) $\frac{s}{M}$. D) None of the above. Show Answer Correct Answer: A) $s^{-1}$. 18. Increasing temperature of a chemical reaction: A) Increases the number of collisions per second of chemical reactants. B) Increases the speed of reaction. C) Can increase the pressure of reactants. D) All of the above. Show Answer Correct Answer: D) All of the above. 19. What is the parameter to measure the rate or speed of a reaction beside time? A) Change in volume. B) Change in concentration. C) Change in pressure. D) Change in temperature. Show Answer Correct Answer: B) Change in concentration. 20. The activation energy of a reaction can be determined from: A) Arrhenius equation. B) Rate law. C) Molecularity. D) Stoichiometry. Show Answer Correct Answer: A) Arrhenius equation. 21. In rate law expression:Rate = k [A]$^{p}$[B]$^{q}$, p and q are A) Coefficients of reactants A and B in the chemical reaction. B) Always constant for all the reactions. C) Determined experimentally. D) Can be determined by Collision theory. Show Answer Correct Answer: C) Determined experimentally. 22. In an exothermic reaction, the activation energy for the forward reaction is: A) Greater than reverse reaction. B) Less than reverse reaction. C) Equal to reverse reaction. D) Zero. Show Answer Correct Answer: B) Less than reverse reaction. 23. The rate constant increases with increasing temperature because: A) More molecules have energy greater than activation energy. B) Activation energy increases. C) Concentration increases. D) Catalyst is used. Show Answer Correct Answer: A) More molecules have energy greater than activation energy. 24. It is defined as the energy contained within a system. A) Heat. B) Internal energy. C) Enthalpy. D) Temperature. Show Answer Correct Answer: B) Internal energy. 25. What role does molecularity play in determining reaction rates? A) Molecularity determines the color change during a reaction. B) Molecularity is unrelated to the concentration of reactants. C) Molecularity only affects the temperature of a reaction. D) Molecularity determines the number of reactant molecules involved in a reaction, influencing the reaction rate through collision frequency. Show Answer Correct Answer: D) Molecularity determines the number of reactant molecules involved in a reaction, influencing the reaction rate through collision frequency. ← 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