This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics – Quiz 13 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 13 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What factors can influence the rate of a chemical reaction? A) Color, volume, time, light, humidity. B) Temperature, concentration, surface area, catalyst, pressure. C) All the above. D) None of the above. Show Answer Correct Answer: B) Temperature, concentration, surface area, catalyst, pressure. 2. Olivia wants to keep her leftovers fresh for a longer time. Which of the following actions involves controlling the rate of a chemical reaction? A) Using sunscreen. B) Refrigerating food. C) Wearing safety goggles. D) Washing hands. Show Answer Correct Answer: B) Refrigerating food. 3. The sum of the exponents to which the molar concentration in the rate law equation are raised is called A) Order of reaction. B) Molecularity of reaction. C) Speed of the reaction. D) None of the above. Show Answer Correct Answer: A) Order of reaction. 4. Which of the following is an appropriate dimension for the zero order rate? A) Mg/hour. B) Hour-1. C) Mole. D) Gram. Show Answer Correct Answer: A) Mg/hour. 5. Which among the following is a false statement? (a) Rate of zero order reaction is independent of initial concentration of reactant. (b) Half life of a third order reaction is inversely proportional to square of initial concentration of the reactant. (c) Molecularity of a reaction may be zero or fraction. (d) For a first order reaction, t$_{1/2}$=0.693K A) A. B) B. C) C. D) D. Show Answer Correct Answer: C) C. 6. What two factors govern whether a collision between reacting particles will be effective? A) Orientation and potential energy. B) Kinetic energy and temperature. C) Kinetic energy and orientation. D) Potential energy and kinetic energy. Show Answer Correct Answer: C) Kinetic energy and orientation. 7. Half-life of a zero order reaction depends on both the initial concentration or amount of the substance and the rate of reaction A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 8. How does the rate of a forward reaction compare to the rate of a reverse reaction at equilibrium? A) The reverse reaction is always faster than the forward reaction. B) The forward reaction is always faster than the reverse reaction. C) The rates of the forward and reverse reactions are unequal at equilibrium. D) The rates of the forward and reverse reactions are equal at equilibrium. Show Answer Correct Answer: D) The rates of the forward and reverse reactions are equal at equilibrium. 9. The time for half life period of a certain reaction A $\rightarrow$ Products is 1 h. When the initial concentration of the reactant 'A' is 2.0 mol L$^{-1}$, how much time does it take for its concentration to come from 0.50 to 0.25 mol L$^{-1}$, if it is a zero order reaction? A) 0.25 h. B) 1 h. C) 4 h. D) 0.5 h. Show Answer Correct Answer: A) 0.25 h. 10. Which of the following are true of reaction rates?I. The overall rate law is determined by the fastest step of a reactionII. The presence of a catalyst will increase the number of molecules entering the transition stateIII. An increase in temperature will increase the rate of a reactionIV. Increasing the concentration of reactants will increase the rate at which products yield A) II+III+IV. B) I+IV. C) II + III. D) I+II+III. Show Answer Correct Answer: C) II + III. 11. Which of these does not influence the rate of reaction? A) Nature of the reactants. B) Concentration of the reactants. C) Temperature of the reaction. D) Molecularity of the reaction. Show Answer Correct Answer: D) Molecularity of the reaction. 12. What is the significance of a catalyst in enhancing reaction rates? A) A catalyst is a substance that increases the energy required for a reaction to occur. B) A catalyst is a substance that remains unchanged after the reaction and speeds it up. C) A catalyst is a reactant that is fully consumed during the reaction. D) A catalyst is a product that forms as a result of the reaction. Show Answer Correct Answer: B) A catalyst is a substance that remains unchanged after the reaction and speeds it up. 13. For which order reaction units of rate constant and rate of reaction are same A) First order. B) Zero order. C) Second order. D) None of the above. Show Answer Correct Answer: B) Zero order. 14. What does [ ] denote? A) Concentration, M. B) Concentration, m. C) Concentration, mass %. D) Squared. Show Answer Correct Answer: A) Concentration, M. 15. What does the term 'molecularity' refer to? A) The rate of a reaction. B) The number of molecules involved in an elementary reaction. C) The concentration of reactants. D) The number of steps in a reaction. Show Answer Correct Answer: B) The number of molecules involved in an elementary reaction. 16. What is the formula for change in enthalpy ( $\Delta$ A) PE of Reactants + Products. B) PE of reactants-products. C) PE of products-reactants. D) PE of products + reactants. Show Answer Correct Answer: C) PE of products-reactants. 17. Explain the concept of activation energy and its significance in chemical kinetics. A) Activation energy is only relevant in biological processes. B) Activation energy is constant for all reactions. C) Activation energy is crucial in determining the rate of chemical reactions by influencing the likelihood of successful collisions between reactant molecules. D) Activation energy has no impact on chemical reactions. Show Answer Correct Answer: C) Activation energy is crucial in determining the rate of chemical reactions by influencing the likelihood of successful collisions between reactant molecules. 18. Arrhenius equation is A) K = Ae$^{Ea/RT}$. B) K = Ae$^{-Ea/RT}$. C) K = Ae$^{RT/Ea}$. D) K = Ae$^{-RT/Ea}$. Show Answer Correct Answer: B) K = Ae$^{-Ea/RT}$. 19. Which one of the following is a second order, overall reaction A) K$_{1}$= 1.000 M s$^{-1}$. B) K$_{1}$= 5403.2 M$^{1/2}$ s$^{1/2}$. C) K$_{1}$= 1.23 x 10$^{-6}$ M$^{-1}$ s$^{-1}$. D) K$_{1}$= 10.7 s$^{-1}$. Show Answer Correct Answer: C) K$_{1}$= 1.23 x 10$^{-6}$ M$^{-1}$ s$^{-1}$. 20. The half life of the first order reaction having rate constant K = 1.7 x 10$^{-5}$s$^{-1}$ is A) 12.1 h. B) 9.7 h. C) 11.3 h. D) 1.8 h. Show Answer Correct Answer: C) 11.3 h. 21. Increasing the temperature increases the rate of a reaction by A) Lowering the activation energy. B) Increasing the activation energy. C) Lowering the frequency of effective collisions between reacting molecules. D) Increasing the frequency of effective collisions between reacting molecules. Show Answer Correct Answer: D) Increasing the frequency of effective collisions between reacting molecules. 22. A hypothetical reaction 2 p+q $\rightarrow$ s+r has rate constant as 2.0 x 10$^{-3}$ mol lit$^{-1}$ sec$^{-1}$, The order of the reaction is A) Unpredictable. B) Zero. C) One. D) Two. Show Answer Correct Answer: B) Zero. 23. A catalyst alters, which of the following in a chemical reaction? A) Entropy. B) Enthalpy. C) Internal energy. D) Activation energy. Show Answer Correct Answer: D) Activation energy. 24. For a second-order reaction, if the initial concentration is doubled, how does the half-life change? A) Halves. B) Doubles. C) Remains constant. D) Quadruples. Show Answer Correct Answer: B) Doubles. 25. If there is only single substance (atom, molecule, or ion) involved in the rate-determining step, that reaction is said to be A) Unimolecular. B) Bimolecular. C) Polimolecular. D) Trimolecular. Show Answer Correct Answer: A) Unimolecular. ← 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