This quiz works best with JavaScript enabled. Home > Cbse > Class 11 > Science > Chemistry Part I > Class 11 Chemistry (Part I) Chapter 7 Equilibrium – Quiz 5 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 7 Equilibrium Quiz 5 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. TRUE or FALSE: "At equilibrium, the CONCENTRATIONS of products STAY the SAME" A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 2. What is the effect of increasing the concentration of a reactant on the equilibrium position? A) Causes the reaction to stop. B) Shift to the right. C) No effect on the equilibrium position. D) Shift to the left. Show Answer Correct Answer: B) Shift to the right. 3. Forward reaction A) To produce. B) The substance that does the dissolving. C) The reaction that forms reactants from products. D) The reaction that forms products from reactants. Show Answer Correct Answer: D) The reaction that forms products from reactants. 4. In a given time period, a person consumes more and more of a good and enjoys each additional unit less and is willing to pay less for it, because of: A) Diminishing marginal product. B) Diminishing returns. C) Diminishing marginal utility. D) Increasing costs. Show Answer Correct Answer: C) Diminishing marginal utility. 5. What factor would prevent equilibrium from being reached A) Constant temperature. B) Closed system. C) Presence of both reactants and products. D) Irreversible reaction. Show Answer Correct Answer: D) Irreversible reaction. 6. TRUE or FALSE: "At equilibrium, the CONCENTRATIONS of reactants and products are EQUAL" A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 7. If the equilibrium constant is much greater than one (K >> 1) then A) Equilibrium lies to the left (reactants are favored). B) Neither products or reactants are favored. C) Equilibrium lies to the right (products are favored). D) Equilibrium is not established. Show Answer Correct Answer: C) Equilibrium lies to the right (products are favored). 8. What do you call the amount where consumers get what they want and suppliers could sell what they're offering? A) Quantity Demanded. B) Quantity Supplied. C) Equilibrium price. D) Equilibrium quantity. Show Answer Correct Answer: D) Equilibrium quantity. 9. A complete reaction is in which: A) All the reactants convert into products. B) All the reactants do not convert into products. C) Half reactants convert into products. D) Only 10% reactants convert into products. Show Answer Correct Answer: A) All the reactants convert into products. 10. What happens to K is a reaction is doubled? A) 1/2K. B) 2K. C) K$^{2}$. D) -K. Show Answer Correct Answer: C) K$^{2}$. 11. Equilibrium price is the price at which the quantity of a product demanded by consumers and the quantity supplied by producers A) Are different. B) Are equal. C) Is higher for the product demanded. D) Is higher for the product supplied. Show Answer Correct Answer: B) Are equal. 12. Gibbs Free Energy is A) U+pV. B) U+TS. C) U-TS. D) H+TS. E) H-TS. Show Answer Correct Answer: E) H-TS. 13. What occurs when thermal equilibrium is reached within a system? A) The system cools down rapidly. B) Heat transfer stops completely. C) All substances within the system have the same temperature. D) Thermal energy flows in the opposite direction. Show Answer Correct Answer: C) All substances within the system have the same temperature. 14. Calculate the pH of water at 40$^\circ$ C, given thatK$_{w}$ = 3.8 x 10$^{-14}$ at this temperature. A) 3.80. B) 7.00. C) 0.58. D) 6.71. Show Answer Correct Answer: D) 6.71. 15. The square brackets in a K$_{c}$ expression represent? A) The same as round brackets. B) Concentration in mol L$^{-1}$. C) Concentration. D) Concentration in g L$^{-1}$. Show Answer Correct Answer: B) Concentration in mol L$^{-1}$. 16. The K$_{sp}$ expression for a saturated solution of Ca$_{3}$(PO$_{4}$)$_{2 }$is A) K$_{sp }$= [3Ca$^{2+}$]$^{3}$[2PO$_{4}$$^{3-}$]$^{2}$. B) K$_{sp }$= [Ca$^{2+}$]$^{3}$[PO$_{4}$$^{3-}$]$^{2}$. C) K$_{sp }$= [Ca$^{2+}$][PO$_{4}$$^{3-}$]. D) K$_{sp }$= [3Ca$^{2+}$][2PO$_{4}$$^{3-}$]. Show Answer Correct Answer: B) K$_{sp }$= [Ca$^{2+}$]$^{3}$[PO$_{4}$$^{3-}$]$^{2}$. 17. The net force on an object in equilibrium is: A) Zero. B) Greater than zero. C) Need more specific information to answer. D) Less than zero. Show Answer Correct Answer: A) Zero. 18. What is the activation energy? A) The quantity of heat absorbed in a reaction. B) The minimum energy needed to begin a reaction. C) The energy given off after reactants collide. D) Both the energy and frequeny of collisions in increasedthe energy difference between reactants and products. Show Answer Correct Answer: B) The minimum energy needed to begin a reaction. 19. Which of the following happens when the Qs is greater than the Qd? A) Equilibrium. B) Shortage. C) Consumer surplus. D) Surplus. Show Answer Correct Answer: D) Surplus. 20. Which of the following is true about chemical reaction at equilibrium A) Only the forward reaction stops. B) Only the reverse reaction stops. C) Both forward and reverse reactions stop. D) The rate constants for the forward and reverse reactions are equal. E) The rates of the forward and reverse reactions are equal. Show Answer Correct Answer: E) The rates of the forward and reverse reactions are equal. 21. Which is a factor that would not affect the rate of a reaction? A) Concentration. B) The weather. C) Adding a catalyst. D) Temperature. Show Answer Correct Answer: B) The weather. 22. What makes an effective collision? A) When molecules collide. B) When molecules collide with the proper orientation. C) When molecules collide with proper orientation and enough kinetic energy. D) High Temperature. Show Answer Correct Answer: C) When molecules collide with proper orientation and enough kinetic energy. 23. What is the amount that producers benefit by selling at a market price that is higher than the least that they would be willing to sell for? A) Shortage. B) Producer Surplus. C) Consumer Surplus. D) Surplus. Show Answer Correct Answer: B) Producer Surplus. 24. Explain the effect on the position of equilibrium of increasing temperature A) Equilibrium position shifts in the exothermic reaction so temperature goes up. B) Equilibrium position shifts in the endothermic reaction so temperature goes down. C) All the above. D) None of the above. Show Answer Correct Answer: B) Equilibrium position shifts in the endothermic reaction so temperature goes down. 25. In a market equilibrium graph, what happens if the demand curve shifts left? A) Price increases. B) Quantity increases. C) Quantity remains constant. D) Price decreases. Show Answer Correct Answer: D) Price decreases. 26. In a chemical reaction at equilibrium, what happens to the concentrations of reactants and products? A) They continue to change over time. B) They remain constant over time. C) They decrease over time. D) They increase over time. Show Answer Correct Answer: B) They remain constant over time. 27. A person sits on a freely spinning lab stool that has no friction in its axle. When this person extends her arms, A) Her moment of inertia increases and her angular speed decreases. B) Her moment of inertia decreases and her angular speed increases. C) Her moment of inertia increases and her angular speed increases. D) Her moment of inertia increases and her angular speed remains the same. Show Answer Correct Answer: A) Her moment of inertia increases and her angular speed decreases. 28. In the context of Le Chatelier's Principle, what is the effect of increasing pressure on the equilibrium position of the reaction @@ext{N} ..... 2(g) + 3ext{H} ..... 2(g) ightleftharpoons 2ext{NH} ..... 3(g)@@? A) Shifts to the left. B) Equilibrium is destroyed. C) No change. D) Shifts to the right. Show Answer Correct Answer: D) Shifts to the right. 29. To protect high-cost domestic producers, a country imposes a tariff on an imported commodity, Y. Which of the following is most likely to occur in the short run?I. A decrease in domestic production of Y II. An increase in domestic production of Y III. An increase in foreign output of Y A) I only. B) II only. C) III only. D) I and III only. E) II and III only. Show Answer Correct Answer: B) II only. 30. Which of the following changes the equilibrium constant? A) Concentration. B) Pressure. C) Catalyst. D) Temperature. Show Answer Correct Answer: D) Temperature. 31. In a chemical equilibrium graph, what does the plateau represent? A) The reaction is accelerating. B) The reaction has stopped. C) The reaction is at equilibrium. D) The reaction is reversing. Show Answer Correct Answer: C) The reaction is at equilibrium. 32. In a reaction at equilibrium involving only gases, a change in pressure of the reaction mixture shifts the position of equilibrium only when: A) The reaction is exothermic as written. B) Heat is absorbed by the reaction proceeding to the right. C) The collision rate increases. D) The gases are impure. E) The moles of gas are not equal on the two sides of the equation. Show Answer Correct Answer: E) The moles of gas are not equal on the two sides of the equation. 33. What type of system is required for a reversible reaction to reach equilibrium? A) Dynamic system. B) Open system. C) Closed system. D) Isolated system. Show Answer Correct Answer: C) Closed system. 34. Identify the incorrect statement about achieving equilibrium. A) Achieved when product and reactant concentrations are equal. B) Achieved when forward and reverse reaction rates are same. C) Achieved when concentration of reactants is stable/constant. D) Achieved when concentration ratio of reactants to products becomes stable, thus fixing the equilibrium constant (equilibrium position). Show Answer Correct Answer: A) Achieved when product and reactant concentrations are equal. 35. Heat always travels from ..... to ..... objects A) Cold to hot. B) Hot to hot. C) Cold to cold. D) Hot to cold. Show Answer Correct Answer: D) Hot to cold. 36. The amount of a substance in a given volume. A) Concentration. B) Catalyst. C) Surface area. D) Temperature. Show Answer Correct Answer: A) Concentration. 37. A situation in which the quantity supplied is greater than the quantity demanded is A) A price ceiling. B) A price floor. C) A shortage. D) A surplus. Show Answer Correct Answer: D) A surplus. 38. A circular roller of weight W hangs by a tie rod and rests against a smooth vertical wall. The tension in the rod AB will be A) Less than weight W. B) Greater then W. C) Equal to W. D) None of these. Show Answer Correct Answer: C) Equal to W. 39. Exposing more particles for collisions is an increase in A) Temperature. B) Concentration. C) Catalyst. D) Surface area. Show Answer Correct Answer: D) Surface area. 40. An equilibrium constant with a large value, e.g. K$_{c}$ = 1000, indicates ..... A) A very fast reaction. B) Mostly products at equilibrium. C) Mostly reactants at equilibrium. D) Nothing useful at all. Show Answer Correct Answer: B) Mostly products at equilibrium. 41. In an experiment, the equilibrium constant $K_p$ $ is found to be 2.0 at 1000 K. If the partial pressures at equilibrium are $ $ and $ $, what is the partial pressure of $ A) 0.3 atm. B) 0.2 atm. C) 0.4 atm. D) 0.1 atm. Show Answer Correct Answer: C) 0.4 atm. 42. Stephen Jay Gould helped develop the ..... model of evolution. A) Gradualism. B) Microevolution. C) Punctuated equilibrium. D) Macroevolution. Show Answer Correct Answer: C) Punctuated equilibrium. 43. Which of the following are Lewis acids? A) PH$_{3}$ and BCl$_{3}$. B) AlCl$_{3 }$and SiCl$_{4}$. C) PH$_{3}$ and SiCl$_{4}$. D) BCl$_{3}$ and AlCl$_{3}$. Show Answer Correct Answer: D) BCl$_{3}$ and AlCl$_{3}$. 44. What is the Ksp for silver phosphate (Ag$_{3}$PO$_{4}$) at 25$^\circ$C? The solubility of silver phosphate at 25$^\circ$C is 1.6 x 10$^{-5}$ mol/L. A) 8.6 x 10$^{-13}$. B) 1.8 x 10$^{-18}$. C) 7.7 x 10$^{-10}$. D) 3.3 x 10$^{-13}$. Show Answer Correct Answer: B) 1.8 x 10$^{-18}$. 45. For the reaction ..... SO$_{2}$ + O$_{2}$ <=> $_{}$SO$_{3}$If the equilibrium position shifts to the right, the concentration of O$^{}$$^{}$$_{2}$ will ..... A) Increase. B) Decrease. C) Remain the same. D) Double. Show Answer Correct Answer: B) Decrease. 46. What is a Couple? A) A pair of concurrent force. B) A pair of Coplanar force. C) A pair of unlike parallel force. D) A pair of Non coplanar concurrent force. Show Answer Correct Answer: C) A pair of unlike parallel force. 47. A situation in which a maximum price is set is referred to as A) A surplus. B) A price floor. C) A shortage. D) A price ceiling. Show Answer Correct Answer: D) A price ceiling. 48. Macro economics deals with A) Individual units. B) Individual Demand. C) Aggregative units. D) All of these. Show Answer Correct Answer: C) Aggregative units. 49. When you raise the temperature, what happens to solvent-solute collisions? A) Less frequent and more energetic. B) More frequent and more energetic. C) Less frequent and less energetic. D) More frequent and less energetic. Show Answer Correct Answer: B) More frequent and more energetic. 50. If K$_{c}$ is small that means the concentration of the ..... is high and therefore the concencentration of the ..... is low. A) Reactants, products. B) Species, reactants. C) Products, reactants. D) Species, products. Show Answer Correct Answer: A) Reactants, products. 51. An equilibrium constant with a value K > 1 means: A) There are more reactants than products at equilibrium. B) There are more products than reactants at equilibrium. C) There are the same amount of products and reactants at equilibrium. D) The reaction is not at equilibrium. Show Answer Correct Answer: B) There are more products than reactants at equilibrium. 52. Mole fractions always have a value between: A) 0 and 1. B) 0 and 100. C) All the above. D) None of the above. Show Answer Correct Answer: A) 0 and 1. 53. When an object is experiencing a net moment, A) It is in static equilibrium. B) It is rotating. C) It is in dynamic equilibrium. D) It is translating. Show Answer Correct Answer: B) It is rotating. 54. Define a surplus A) Where quantity demanded is less than quantity supplied. B) Where quantity demanded is greater than quantity supplied. C) Where quantity demanded is equal to quantity supplied. D) None of the above. Show Answer Correct Answer: A) Where quantity demanded is less than quantity supplied. 55. For a given reaction, N$_{2}$ + 3H$_{2}$ $\rightarrow$ 2NH$_{3}$. 1.0 M of N$_{2}$ is added to 2.0 M H$_{2}$. Once equilibrium has been established, it is found the molarity of NH$_{3 }$is 0.25M. What is the equilibrium concentration of N$_{2}$ and H$_{2}$? A) [N$_{2}$] = 0.75 M, [H$_{2}$ ]= 1.875. B) [N$_{2}$] = 0.5 M, [H$_{2}$ ]= 0.125. C) [N$_{2}$] = 0.85 M, [H$_{2}$ ]= 0.75. D) [N$_{2}$] = 0.875 M, [H$_{2}$ ]= 1.625. Show Answer Correct Answer: D) [N$_{2}$] = 0.875 M, [H$_{2}$ ]= 1.625. 56. Which of the following compounds is NOT appreciably soluble in water but is soluble in dilute hydrochloric acid? A) CuSO$_{4}$ (s). B) (NH$_{4}$)$_{2}$SO$_{4}$ (s). C) Mg(OH)$_{2}$ (s). D) Sr(NO$_{3}$)$_{2}$ (s). E) (NH$_{4}$)$_{2}$CO$_{3}$ (s). Show Answer Correct Answer: C) Mg(OH)$_{2}$ (s). 57. If you have a dramatic change resulting in a new species in between long stretches of time with no change this would be A) Gradualism. B) Swift speciation. C) Punctuated Equilibrium. D) None of the above. Show Answer Correct Answer: C) Punctuated Equilibrium. 58. Which statement is NOT true for a mixture of ice and water at equilibrium at a constant temperature? A) The rates of melting and freezing are equal. B) The amounts of ice and water are equal. C) The same position of equilibrium can be reach by cooling water and heating ice. D) There is no observable change in the system. Show Answer Correct Answer: B) The amounts of ice and water are equal. 59. What is the solubility product constant (Ksp) used to describe? A) The rate at which a solute dissolves in a solvent. B) The equilibrium between a solid and its ions in a saturated solution. C) The concentration of solute in a saturated solution. D) The temperature at which a solute dissolves. Show Answer Correct Answer: B) The equilibrium between a solid and its ions in a saturated solution. 60. In a reversible reaction, two substances are in equilibrium. If the concentration of each one is doubled then the equilibrium constant will be A) Reduced to one fourth of its original value. B) Doubled. C) Reduce to half its original value. D) Constant. Show Answer Correct Answer: D) Constant. ← PreviousNext →Related QuizzesScience QuizzesClass 11 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 6Class 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 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books