This quiz works best with JavaScript enabled. Home > Cbse > Class 11 > Science > Chemistry Part I > Class 11 Chemistry (Part I) Chapter 7 Equilibrium – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Chemistry (Part I) Chapter 7 Equilibrium Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Which of the following is a characteristic of a dynamic equilibrium? A) The forward and reverse reactions occur at different rates. B) The concentrations of reactants and products change over time. C) The forward and reverse reactions occur at the same rate. D) The system is closed and isolated. Show Answer Correct Answer: C) The forward and reverse reactions occur at the same rate. 2. Which statement is always true for a chemical reaction that has reached equilibrium at a constant temperature? A) The yield of product(s) is greater than 50%. B) The rate of the reverse reaction is lower than that of the forward reaction. C) The amounts of reactants and products do not change. D) Both forward and reverse reactions have stopped. Show Answer Correct Answer: C) The amounts of reactants and products do not change. 3. Smaller particle size allows for a ..... surface area to be exposed for the reaction. A) Larger. B) Smaller. C) All the above. D) None of the above. Show Answer Correct Answer: A) Larger. 4. For roller support number unknown reactions A) 2. B) 1. C) 3. D) None of these. Show Answer Correct Answer: B) 1. 5. In an experiment, the equilibrium constant $K_c$ A) The concentration of reactants is much higher than that of products. B) The concentration of products is much higher than that of reactants. C) The concentrations of reactants and products are equal. D) The reaction does not reach equilibrium. Show Answer Correct Answer: B) The concentration of products is much higher than that of reactants. 6. Static equilibrium A) Condition of continuous, random movement of particles but no overall change in concentration of materials. B) The reaction that forms reactants from products. C) A condition where the reaction occurring in a system is completely halted and there exists no movement between the reactants and the products corresponding to the chemical reaction. D) A measurement of how much solute exists within a certain volume of solvent or solution. Show Answer Correct Answer: C) A condition where the reaction occurring in a system is completely halted and there exists no movement between the reactants and the products corresponding to the chemical reaction. 7. It is a chemical reaction where the reactants form products and the products form reactants. A) Reversible reaction. B) Nonreversible reaction. C) Decomposition reaction. D) Standard reaction. Show Answer Correct Answer: A) Reversible reaction. 8. Why is the equilibrium constant expressed using the concentrations of reactants and products rather than their amounts in moles? A) Concentrations allow for easier comparison between different reactions. B) Concentrations are more precise than moles in measuring the extent of a reaction. C) Concentrations take into account the volume of the reaction vessel. D) Concentrations are directly related to the rate of the reaction. Show Answer Correct Answer: C) Concentrations take into account the volume of the reaction vessel. 9. In a population of humans, the frequency of no dimples is 0.36. If having no dimples is the recessive phenotype, what is the frequency of the recessive allele? A) 0.64. B) 0.6. C) 0.36. D) 0.18. Show Answer Correct Answer: B) 0.6. 10. Siapa nama lengkap Bli Monez? A) Ida Bagus Gede Prabawa Putra Udiyana. B) I Made Wahyu Suarjaya. C) Ida Bagus Ratu Antoni Putra. D) Profesor Ida Bagus Mantra. Show Answer Correct Answer: C) Ida Bagus Ratu Antoni Putra. 11. In a house, what is the purpose of insulation in terms of thermal energy transfer? A) To minimize heat transfer. B) To promote rapid heat loss. C) To encourage conduction. D) To enhance radiation. Show Answer Correct Answer: A) To minimize heat transfer. 12. Why does the government place price ceilings on some "essential" goods? A) To prevent inflation during to reduce supply for these goods. B) To keep business people from making large profits. C) To keep the goods from becoming too expensive. D) To reduce demand for these goods. Show Answer Correct Answer: C) To keep the goods from becoming too expensive. 13. Law of DMU state that A) As consumption increases, the additional satisfaction from each unit decreases. B) Additional units of consumption provide the same level of satisfaction. C) The law of DMU states that more consumption always leads to more satisfaction. D) As consumption increases, total satisfaction remains constant. Show Answer Correct Answer: A) As consumption increases, the additional satisfaction from each unit decreases. 14. What is the term used to describe the position of equilibrium when there are more reactants than products? A) Equilibrium lies to the right. B) Dynamic equilibrium. C) Equilibrium lies to the left. D) Static equilibrium. Show Answer Correct Answer: C) Equilibrium lies to the left. 15. What is the rate of reaction? A) How big a reaction is. B) How much gas a reaction produces. C) How loud a reaction is. D) How fast a reaction is. Show Answer Correct Answer: D) How fast a reaction is. 16. What is characterized by changes in conditions where supply and demand are out of balance? A) Market Price. B) Market Disequilibrium. C) Market Equilibrium. D) None of the above. Show Answer Correct Answer: B) Market Disequilibrium. 17. In case of the free body diagram of a body, the false statement(s) is, A) FBD is useful in analysing the equilibrium of a constrained body. B) FBD is helpful in finding reactions at the supports. C) Only active forces are shown in FBD. D) None of the these. Show Answer Correct Answer: C) Only active forces are shown in FBD. 18. Utility is generally related to? A) Necessary. B) Useless. C) Satisfaction. D) Useful. Show Answer Correct Answer: C) Satisfaction. 19. The major theory of reaction rate is called A) Newton's laws. B) Thermodynamics. C) Collision theory. D) Crash theory. Show Answer Correct Answer: C) Collision theory. 20. A consumer is said to be in equilibrium when he is said to get A) Maximum satisfaction. B) Maximum profit. C) All the above. D) None of the above. Show Answer Correct Answer: A) Maximum satisfaction. 21. At equilibrium, ..... A) All chemical reactions have ceased. B) The rate constants of the forward and reverse reactions are equal. C) The rates of the forward and reverse reactions are equal. D) The value of the equilibrium constant is 1. Show Answer Correct Answer: C) The rates of the forward and reverse reactions are equal. 22. In an exothermic reaction energy is transferred from A) Reactants to their surroundings. B) The surroundings to reactants. C) One reactant to another. D) The container to the chemicals. Show Answer Correct Answer: A) Reactants to their surroundings. 23. In a closed system at equilibrium, which of the following changes will NOT affect the equilibrium position of the reaction $N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g)$ A) Increasing the concentration of $N_2$. B) Increasing the temperature. C) Adding a catalyst. D) Decreasing the volume of the container. Show Answer Correct Answer: C) Adding a catalyst. 24. When quantity supplied exceeds quantity demanded at a certain price. A) Shortage. B) Search costs. C) Surplus. D) Fad. Show Answer Correct Answer: C) Surplus. 25. In the equilibrium reaction, what is the effect of removing from the system? A) The reaction stops. B) The equilibrium shifts to the left. C) The equilibrium shifts to the right. D) The equilibrium remains unchanged. Show Answer Correct Answer: C) The equilibrium shifts to the right. 26. Which Hardy-Weinberg factor represents the frequency of heterozygous individuals in a population? A) Q2. B) P2. C) 2pq. D) P2 + 2pq. Show Answer Correct Answer: C) 2pq. 27. "holding all else equal, when the price of a good rises, suppliers increase their quantity supplied for that good" A) Law of supply. B) Law of demand. C) Law of equilibrium. D) Opportunity cost. Show Answer Correct Answer: A) Law of supply. 28. If TU of 10 units is 100 and TU of 15 units is 150 than calculate MU A) 25. B) 50. C) 20. D) 10. Show Answer Correct Answer: D) 10. 29. Any price where quantity demanded is not equal to the quantity supplied is known as disequilibrium. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 30. In the reaction @@ext{N} ..... 2(g) + 3ext{H} ..... 2(g) ightleftharpoons 2ext{NH} ..... 3(g)@@, what effect will decreasing the pressure have on the equilibrium position? A) Shift to the right, favoring the formation of ammonia. B) Shift to the left, favoring the formation of nitrogen and hydrogen. C) No effect on the equilibrium position. D) Increase the rate of the forward reaction. Show Answer Correct Answer: B) Shift to the left, favoring the formation of nitrogen and hydrogen. 31. Which of the following would be most likely to result in a reduction in the rate of a chemical reaction? A) Lowering the activation energy for a reaction. B) Warming an exothermic reaction. C) Stirring a solid and liquid reactant. D) Crushing a solid reactant. Show Answer Correct Answer: B) Warming an exothermic reaction. 32. How can the equilibrium constant be affected by changes in pressure? A) Decreasing the pressure will increase the value of K. B) Changes in pressure have no effect on the value of K. C) Increasing the pressure will increase the value of K. D) Increasing the pressure will decrease the value of K. Show Answer Correct Answer: B) Changes in pressure have no effect on the value of K. 33. What does a double arrow in the middle of a chemical reaction indicate? A) The reaction is reversible. B) The reaction is endothermic. C) The reaction is irreversible. D) The reaction is exothermic. Show Answer Correct Answer: A) The reaction is reversible. 34. 20 mL of 0.1 M H$_{2}$SO$_{4}$ solution is added to 30 mL of 0.2 M NH$_{4}$OH solution. The pH of the resultant mixture is [pK$_{b}$ of NH$_{4}$OH = 4.7] A) 5.0. B) 9.0. C) 9.4. D) 5.2. Show Answer Correct Answer: B) 9.0. 35. If AD A) Underemployed resources would be properly utilized. B) Government would increase taxes. C) Firms would decrease employment. D) Firms will spend more on investment. Show Answer Correct Answer: C) Firms would decrease employment. 36. The [IO$_{3}$$^{-}$] in a saturated solution of Ce(IO$_{3}$)$_{3}$ is 5.55 x 10$^{-3 }$M. Calculate the Ksp for Ce(IO$_{3}$)$_{3}$. A) 1.03 x 10$^{-5}$. B) 3.51 x 10$^{-11}$. C) 3.16 x 10$^{-10}$. D) 2.56 x 10$^{-8}$. Show Answer Correct Answer: C) 3.16 x 10$^{-10}$. 37. If MU is positive, TU will be A) Constant. B) Undefined. C) Increasing. D) Decreasing. Show Answer Correct Answer: C) Increasing. 38. The increase of pressure on ice water system at constant temperature will lead to A) An increase in the Gibbs energy of the system. B) A decrease in the entropy of the system. C) No effect on that equilibrium. D) A shift of the equilibrium in the forward direction. Show Answer Correct Answer: D) A shift of the equilibrium in the forward direction. 39. The concentration @ pressure of ..... and ..... are NOT included in the equilibrium constant expression, Kc and Kp. A) Solid, gas. B) Solid, liquid. C) Gas, aqueous. D) Gas, liquid. Show Answer Correct Answer: B) Solid, liquid. 40. A reaction has an equilibrium constant $K_{eq} = 0.5$ A) The concentration of products is greater than the concentration of reactants. B) The concentration of reactants is greater than the concentration of products. C) The concentrations of reactants and products are equal. D) The reaction does not reach equilibrium. Show Answer Correct Answer: B) The concentration of reactants is greater than the concentration of products. 41. In the context of punctuated equilibrium, what is meant by 'stasis'? A) The formation of a new species. B) Rapid evolutionary change. C) The extinction of a species. D) A period of little or no evolutionary change. Show Answer Correct Answer: D) A period of little or no evolutionary change. 42. When the quantity supplied exceeds the quantity demanded it is known as A) A surplus. B) A shortage. C) Equilibrium. D) A subsidy. Show Answer Correct Answer: A) A surplus. 43. Which of the following best describes dynamic equilibrium in a chemical reaction? A) The forward and reverse reactions stop. B) The concentrations of reactants and products are equal. C) The forward and reverse reactions occur at the same rate. D) The reaction has reached completion. Show Answer Correct Answer: C) The forward and reverse reactions occur at the same rate. 44. At a certain temperature, K = 1 for the reaction. At equilibrium, you can be certain that: A) [HCl] = 2[H2]. B) [H2][Cl2]/[HCl]2 = 1. C) [H2] = [Cl2]. D) [HCl] = [H2] = [Cl2] = 1. Show Answer Correct Answer: B) [H2][Cl2]/[HCl]2 = 1. 45. For the exothermic reaction @@ext{A} + ext{B} ightleftharpoons ext{C} + ext{D}@@, what is the effect of decreasing the temperature on the position of equilibrium? A) The reaction stops. B) Equilibrium shifts to the left, favoring the formation of reactants. C) There is no change in the position of equilibrium. D) Equilibrium shifts to the right, favoring the formation of products. Show Answer Correct Answer: D) Equilibrium shifts to the right, favoring the formation of products. 46. A rational consumer will be react under MUx> Px A) Decrease consumption of good X. B) Increase consumption of good X. C) Stop consuming good X altogether. D) Maintain current consumption of good X. Show Answer Correct Answer: B) Increase consumption of good X. 47. Siapa nama moderator EQUITALK 2021? A) Mutiara Diva Ramadanti. B) Mutiara Diva Ramadhani. C) Mutiara Diva Rahayuni. D) Mutiara Diva Aura. Show Answer Correct Answer: B) Mutiara Diva Ramadhani. 48. Stable equilibrium: ..... A) An object experiencing balanced forces while at a constant velocity. B) An object at rest experiencing balanced forces. C) None. D) An object experiencing balanced forces while at a change velocity. Show Answer Correct Answer: B) An object at rest experiencing balanced forces. 49. One clue of a chemical change is the formation of a precipitate. A precipitate is formed when A) Two liquids react and a gas is produced. B) A solid dissolves in a liquid. C) One liquid dissolves in another. D) Two liquids react and a solid is formed. Show Answer Correct Answer: D) Two liquids react and a solid is formed. 50. According to Bronsted-Lowry concept, base is a substance which is A) A proton acceptor. B) An electron pair acceptor. C) A proton donor. D) An electron pair donor. Show Answer Correct Answer: A) A proton acceptor. 51. Only (aq), (l), and (g) appear in an equilibrium expression. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 52. At the start of a reversible process, the reaction proceeds towards the formation of: A) Products. B) Catalysts. C) Reactants. D) Equilibrium. Show Answer Correct Answer: A) Products. 53. Unstable Equilibrium:a kind of equilibrium so that when the object is slightly changed, it go further from its original position. A) True. B) False. C) None. D) None of the above. Show Answer Correct Answer: A) True. 54. What is the effect of catalyst on a reversible reaction? A) Catalyst increases the product of a reaction. B) Catlyst increases the equilibrium constant. C) Catalyst increases the rate of the forward reaction. D) Catalyst increases both the rate of forward and reverse reaction. Show Answer Correct Answer: D) Catalyst increases both the rate of forward and reverse reaction. 55. When demand increases, the equilibrium price and quantity supplied will both A) Increase. B) Decrease. C) Stay the same. D) None of the above. Show Answer Correct Answer: A) Increase. 56. Which of the following will never affect the position of an equilibrium? A) The concentration of reactants. B) A catalyst. C) The pressure. D) The temperature. Show Answer Correct Answer: B) A catalyst. 57. How do catalysts increase the rate of reaction? A) The frequency of collisions is the increased. B) The activation energy is lowered. C) The energy of collisions is increased. D) Both the frequency and energy of collisions is increased. Show Answer Correct Answer: B) The activation energy is lowered. 58. The necessary condition in Indifference curve analysis for equilibrium is A) MRSxy =-P1/P2. B) MUx/Px = MUy/Py. C) MRSxy increases. D) MUx = Px. Show Answer Correct Answer: A) MRSxy =-P1/P2. 59. What is the significance of the equilibrium constant $K_{eq}$ A) Indicates the pressure of reaction. B) Indicates the temperature of reaction. C) Indicates the extent of reaction. D) Indicates the speed of reaction. Show Answer Correct Answer: C) Indicates the extent of reaction. 60. Calculate Kc for the reaction HI$_{(g) }$$\rightarrow$ H$_{2(g)}$ + I$_{2(g}$) given that the concentrations of each species at equilibrium are as follows:[HI] = 0.85 mol/L, [I$_{2}$] = 0.60 mol/L, [H$_{2}$] = 0.27mol/L. A) 5.25. B) 160. C) 4.5. D) 0.22. E) 0.19. Show Answer Correct Answer: D) 0.22. 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