This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Chemistry (Part I) Chapter 7 Equilibrium – Quiz 6 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 7 Equilibrium Quiz 6 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. When the forward and reverse reactions are occurring at the same rate, the reaction is said to be at: A) Chemical equilibrium. B) Chemical reaction. C) Chemical constant. D) Chemical peace. Show Answer Correct Answer: A) Chemical equilibrium. 2. Such reactions which continue in both directions are called: A) Irreversible reactions. B) Reversible reactions. C) Non-reactive reactions. D) Dynamic reactions. Show Answer Correct Answer: B) Reversible reactions. 3. A push or a pull that acts on an object is: A) An ampere. B) Density. C) A circuit. D) A force. Show Answer Correct Answer: D) A force. 4. For an endothermic reaction, increasing the temperature A) Does not shift the equilibrium since K is a constant. B) Increases the rate of the reverse reaction to form more reactants. C) Increases the rate of the forward reaction to form more products. D) Increases the rate of the reverse reaction to form more products. Show Answer Correct Answer: C) Increases the rate of the forward reaction to form more products. 5. In a graph showing equilibrium of a gas reaction, what does a horizontal line indicate? A) Constant pressure. B) Constant volume. C) Constant temperature. D) Constant concentration. Show Answer Correct Answer: D) Constant concentration. 6. In a saturated solution of Zn(OH)$_{2}$ at 25$^{o}$C, the value of [OH$^{-}$] is 2.0 x 10$^{-6}$ M. What is the value of the solubility product constant, Ksp, for Zn(OH)$_{2}$ at 25$^{o}$C? A) 4.0 x 10$^{-18}$. B) 8.0 x 10$^{-18}$. C) 1.6 x 10$^{-17}$. D) 4.0 x 10$^{-12}$. E) 2.0 x 10$^{-6}$. Show Answer Correct Answer: A) 4.0 x 10$^{-18}$. 7. If a reaction is reversible and has reached equilibrium, what can be said about the amounts of reactants and products? A) Some reactant, some product. B) No reactant, all product. C) All reactant, no product. D) None of the above. Show Answer Correct Answer: A) Some reactant, some product. 8. Which of the following statements about chemical equilibrium is true? A) At equilibrium, the concentrations of reactants and products are equal. B) At equilibrium, the rate of the forward reaction equals the rate of the reverse reaction. C) At equilibrium, the reaction stops completely. D) At equilibrium, the concentration of products is always higher than that of reactants. Show Answer Correct Answer: B) At equilibrium, the rate of the forward reaction equals the rate of the reverse reaction. 9. What kind of force can be acting on an object in equilibrium? A) Balanced. B) Unbalanced. C) Counter clockwise. D) Clockwise. Show Answer Correct Answer: A) Balanced. 10. Which of the following changes in the supply of and the demand for a good will definitely result in a decrease in both the equilibrium price and quantity of the good? A) Supply-IncreaseDemand-Increase. B) Supply-IncreaseDemand-No change. C) Supply-No changeDemand-Decrease. D) Supply-DecreaseDemand-Increase. E) Supply-DecreaseDemand-Decrease. Show Answer Correct Answer: C) Supply-No changeDemand-Decrease. 11. What is the term used to describe the point where the forward and backward reactions in a reversible reaction occur at the same rate? A) Catalysis. B) Equilibrium. C) Activation energy. D) Inhibition. Show Answer Correct Answer: B) Equilibrium. 12. How does the addition of a catalyst affect the equilibrium constant of a reaction? A) It increases the equilibrium constant. B) It decreases the equilibrium constant. C) It has no effect on the equilibrium constant. D) It changes the equilibrium constant depending on the reaction. Show Answer Correct Answer: C) It has no effect on the equilibrium constant. 13. In a closed system at dynamic equilibrium, what happens if the concentration of a reactant is increased? A) The equilibrium shifts to the right, favoring the formation of products. B) The equilibrium shifts to the left, favoring the formation of reactants. C) The equilibrium remains unchanged. D) The reaction stops. Show Answer Correct Answer: A) The equilibrium shifts to the right, favoring the formation of products. 14. Unit of Moment A) Newton. B) Nm. C) N/m. D) Kg/m. Show Answer Correct Answer: B) Nm. 15. A 1000N man is playing on a seesaw with son who has a weight of 250N. If the child is sitting 4 meters away, how far will the man have to sit to balance the seesaw? A) 0.75m. B) 3m. C) 1.5m. D) 1m. Show Answer Correct Answer: D) 1m. 16. What happens to the level of national income, when aggregate supply exceeds aggregate demand? A) Increases. B) Decreases. C) Remains constant. D) None of the above. Show Answer Correct Answer: B) Decreases. 17. Can the value of the equilibrium constant (K) change with temperature? A) Yes, the value of K is temperature-dependent. B) No, the value of K remains constant regardless of temperature. C) Only for exothermic reactions. D) Only for endothermic reactions. Show Answer Correct Answer: A) Yes, the value of K is temperature-dependent. 18. Moment is the product of a force exerted on an object times the distance from applied force to the rotational axis. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 19. At equilibrium, the rate of the forward reaction is ..... the rate of the backward reaction A) Greater than. B) Equal to. C) Less than. D) None of the above. Show Answer Correct Answer: B) Equal to. 20. Which one of the following will change the value of an equilibrium constant? A) Changing the volume of the reaction vessel. B) Changing temperature. C) Varying the initial concentrations of reactants. D) Adding other substances that do not react with any of the species involved in the equilibrium. Show Answer Correct Answer: B) Changing temperature. 21. Below are the example of rigid body except: A) Beam. B) Slab. C) Cement. D) Column. Show Answer Correct Answer: C) Cement. 22. Which of these will change the value of the equilibrium constant? A) Increasing the initial concentration of a reactant. B) Increasing the temperature of the system. C) Increasing the pressure for a gas phase reaction. D) All of these will change the equilibrium constant. Show Answer Correct Answer: B) Increasing the temperature of the system. 23. What is the K$_{eq}$ expression for this reaction? A) K$_{c }$= [NO$_{2}$]$^{2}$ / [NO]$^{2 }$[O$_{2}$]. B) K$_{c }$= [NO]$^{2 }$[O$_{2}$] / [NO$_{2}$]$^{2}$. C) K$_{c }$= [NO]$^{2 }$[O$_{2}$] [NO$_{2}$]$^{2}$. D) K$_{c }$= [NO$_{2}$]$^{2}$ / [NO]$^{2}$ + [O$_{2}$]. Show Answer Correct Answer: A) K$_{c }$= [NO$_{2}$]$^{2}$ / [NO]$^{2 }$[O$_{2}$]. 24. Jack has a weight of 300 N and sits 2.0 m from the pivot of see-saw. Jill has a weight of 450 N and sits 1.5 m from pivot. Who will move down? A) Jack. B) Jill. C) Both of them. D) None of them. Show Answer Correct Answer: B) Jill. 25. Suppose a doorknob is placed at the center of a door. Compared with a door whose knob is located at the edge, what amount of force must be applied to this door to produce the torque needed to open it? A) 1/4 as much. B) 1/2 as much. C) Twice as much. D) Four times as much. Show Answer Correct Answer: C) Twice as much. ← PreviousNext →Related QuizzesClass 11 Chemistry (Part I) Chapter 7 Equilibrium Quiz 1Class 11 Chemistry (Part I) Chapter 7 Equilibrium Quiz 2Class 11 Chemistry (Part I) Chapter 7 Equilibrium Quiz 3Class 11 Chemistry (Part I) Chapter 7 Equilibrium Quiz 4Class 11 Chemistry (Part I) Chapter 7 Equilibrium Quiz 5Class 11 Chemistry (Part I) Chapter 7 Equilibrium Quiz 7Class 11 Chemistry (Part I) Chapter 7 Equilibrium Quiz 8Class 11 Chemistry (Part I) Chapter 7 Equilibrium Quiz 9Class 11 Chemistry (Part I) Chapter 7 Equilibrium Quiz 10Class 11 Chemistry (Part I) Chapter 7 Equilibrium Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books