This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics – Quiz 20 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Chemistry (Part I) Chapter 4 Chemical Kinetics Quiz 20 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Increasing the temperature in a reaction lowers the activation energy. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 2. The rate law expresses the reactant of the reaction A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 3. Which one of the following is a first 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: D) K$_{1}$= 10.7 s$^{-1}$. 4. Which one of the following is NOT a characteristic of a zero-order drug decomposition reaction? A) The half-life of the drug decomposition is directly proportional to the initial concentration of API. B) The rate of reaction is independent of the concentration of any of the reactants. C) The units of the rate constant (k) are time-1. D) The rate of reaction is constant. Show Answer Correct Answer: C) The units of the rate constant (k) are time-1. 5. What will happen if no salt bridge were used in an electrochemical cell ( like Zn-Cu) A) The circuit will run and current will flow. B) The circuit will run but current stops. C) The circuit will stop working hence current also inform. D) Alllu lay lo Welomce moviee. Show Answer Correct Answer: C) The circuit will stop working hence current also inform. 6. Which will not generally increase the rate of a chemical reaction? A) Increasing the surface area of solid reactant particles. B) Increasing the size of solid reactant particles. C) Increasing the concentration of the reactant particles. D) Decreasing the activation energy. Show Answer Correct Answer: B) Increasing the size of solid reactant particles. 7. A ..... may increase or decrease the rate of the reaction A) Reactant. B) Product. C) Catalyst. D) Both 1 and 2. Show Answer Correct Answer: C) Catalyst. 8. Which statement is false about molecularity of a reaction? A) In complex reaction, molecularity is equal to the number of molecules present in the rate law equation. B) Molecularity is a theoretical concept. C) Molecularity of a reaction can have integral values only. D) Molecularity of a reaction can be zero. Show Answer Correct Answer: D) Molecularity of a reaction can be zero. 9. In a reversible reaction reaction, the rate of degradation is expressed as A) -dB/dt=Kf[A]-kr[B]. B) -dB/dt=Kf[B]-kr[A]. C) DB/dt=Kf[A]-kr[B]. D) -dB/dt=Kr[A] + kf[B]. Show Answer Correct Answer: A) -dB/dt=Kf[A]-kr[B]. 10. More collisions correspond to a: A) Faster reaction rate. B) Slower reaction rate. C) Constant reaction rate. D) None of the above. Show Answer Correct Answer: A) Faster reaction rate. 11. What is chemical kinetic? A) Study of the chemical rate and reaction mechanism. B) Study of the reaction between reaction rate and concentration of the reactant. C) Study of the reaction rate and surface area of the reactants. D) None of the above. Show Answer Correct Answer: A) Study of the chemical rate and reaction mechanism. 12. What is the difference between average rate and instantaneous rate? A) Average rate is over an interval; instantaneous rate is at a specific moment. B) Average rate is calculated at a single point in time. C) Average rate is always higher than instantaneous rate. D) Instantaneous rate is an average over time. Show Answer Correct Answer: A) Average rate is over an interval; instantaneous rate is at a specific moment. 13. For the reaction A giving B, the rate of a reaction becomes sixty four times when concentration of A is increased four times. what is the order of the reaction? A) 2. B) 4. C) 3. D) 1. Show Answer Correct Answer: C) 3. 14. What is required for a chemical reaction to occur? A) Standard temperature and pressure. B) A catalyst added to the reaction system. C) Effective collisions between reactant particles. D) An equal number of moles of reactants and products. Show Answer Correct Answer: C) Effective collisions between reactant particles. 15. For a zero order reaction, the half life depends on the initial concentration [C$_{o}$] of the reactant as3A $\rightarrow$ B+ CIt would be a zero order reaction when: A) The reaction rate is proportional to the square of concentration of A. B) The reaction rate remains the same at any concentration of A. C) The reaction rate remains unchanged at any concentration of B and C. D) The reaction rate doubles if concentration of B is increased to double. Show Answer Correct Answer: B) The reaction rate remains the same at any concentration of A. 16. In the elementary reaction 2A + B $\rightarrow$ A2B, if the concentration of A is doubled and that of B is halved, then the rate of the reaction will A) Increase 2 times. B) Increase 4 times. C) Decrease 2 times. D) Remain the same. Show Answer Correct Answer: B) Increase 4 times. 17. $\ln\left[A\right]=-kt+\ln\left[A\right]o$ A) 0 order reaction. B) 1st order reaction. C) 2nd order reaction. D) 3rd order reaction. Show Answer Correct Answer: B) 1st order reaction. 18. It is defined as the degree of coldness or hotness of an object A) Heat. B) Internal energy. C) Enthalpy. D) Temperature. Show Answer Correct Answer: D) Temperature. 19. To measure rate of reaction, we can monitor change in which of the following? A) Reactants only. B) Products only. C) Reactants or products. D) None of the above. Show Answer Correct Answer: C) Reactants or products. 20. For a given process, the Ea forward is +120kJ. For the reverse reaction, the Ea is +70kJ. What is the energy change for the forward process? A) -50kJ. B) -190kJ. C) +190kJ. D) +50kJ. E) 0kJ. Show Answer Correct Answer: D) +50kJ. 21. If the rate of formation of ammonia (NH$_{3}$) is 0.50 M/s, what is the rate of disappearance of H$_{2}$?N$_{2}$ (g) + 3 H$_{2 }$(g) $\rightarrow$ 2 NH$_{3}$ (g) A) .25 M/s. B) 1 M/s. C) .75 M/s. D) .125 M/s. Show Answer Correct Answer: C) .75 M/s. 22. What is the term for the study of reaction mechanisms? A) Chemical kinetics. B) Thermodynamics. C) Chemical equilibrium. D) Stoichiometry. Show Answer Correct Answer: A) Chemical kinetics. 23. For a given chemical reaction, the addition of a catalyst provides a different reaction pathway that A) Decreases the reaction rate and has a higher activation energy. B) Decreases the reaction rate and has a lower activation energy. C) Increases the reaction rate and has a higher activation energy. D) Increases the reaction rate and has a lower activation energy. Show Answer Correct Answer: D) Increases the reaction rate and has a lower activation energy. 24. What does the term 'activation energy' refer to in chemical reactions? A) Activation energy is the energy required to break chemical bonds in reactants. B) Activation energy is the energy needed to initiate a chemical reaction. C) Activation energy is the energy released during a chemical reaction. D) Activation energy is the energy that determines the temperature of a reaction. Show Answer Correct Answer: B) Activation energy is the energy needed to initiate a chemical reaction. 25. The half-life of a first-order reaction ..... A) Is constant. B) Is the time necessary for the reactant concentration to dropto half its original value. C) Does not depend on the initial reactant concentration. D) All of the choices are correct. Show Answer Correct Answer: B) Is the time necessary for the reactant concentration to dropto half its original value. ← 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