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Chemistry CHEMICAL EQUILIBRIUM MCQS

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1. In equilibrium constant expression, the concentration of products is taken in/on the




2. Unit of equilibrium constant for H2 + I2 2HI is




3. What is the representation of a reversible reaction?




4. The rate at which the reaction proceeds is directly proportional to the product of the active masses of




5. Which of the following is the correct representation for active mass?




6. Unit of the equilibrium constant for H2 + CO2 H2O + CO is




7. What percentage of ammonia is given after cooling the equilibrium mixture by the Haber process?




8. Due to the high concentration of reactants, the rate of the forward reaction is




9. In the reverse reaction SO3 decomposes in to




10. Unit of the equilibrium constant for N2 + O2 2NO is




11. The relationship by which the values that relate amounts of products to reactants at equilibrium can be determined is called




12. The term active mass shows the concentration of reactants and products in




13. The equilibrium constant can be used to determine the equilibrium concentration of equilibrium mixture knowing the




14. When diluting acid always add




15. The state at which forward and reverse reactions occur at the same rate is




16. Which of the following is used as a catalyst in the contact process?




17. Which process is used for the large scale production of sulphuric acid?




18. The rate at which the reaction proceeds is directly related to




19. Unit of the equilibrium constant for 2NO + O2 2NO2 is




20. Unit of equilibrium constant for PCl5 PCl3 + Cl2




21. What is denoted by the subscript c in Kc?




22. What percentage of ammonia is produced at equilibrium by the Haber process?




23. In Habers process, the amount of ammonia yields is




24. What is established when the rate of evaporation equals the rate of condensation?




25. The rate at which a substance reacts is directly proportional to its




26. The reactions in which reactants react to form products and simultaneously products reverse back into reactants are called




27. The equilibrium constant can be used to




28. The process by which ammonia is produced by the reaction of nitrogen with hydrogen at 200 atm pressure and in the presence of a catalyst is called




29. If a change is imposed in concentration, temperature or pressure on a chemical system at equilibrium, the system responds in a way that the change is




30. Which of the following statements about catalysts is not true?




31. A substance which increases the rate of reaction is called




32. If the concentration, temperature, and pressure is changed, the system responds in a way that




33. The conditions for equilibrium of concentration of reactant and products will be the same if




34. A reversible reaction




35. What is the term used for a state of a chemical reaction in which forward and reverse reactions take place at the same rate?




36. Which of the following has made it possible to get the maximum amount of products?




37. Unit of the equilibrium constant for N2O4 2NO2 is




38. Which of the following statements about the equilibrium constant is not true?




39. The law of mass action was proposed by




40. Which of the following reactions causes acid droplets to spew in all directions?




41. Kf and Kr are




42. Substances which increase the rate of a chemical reaction are called




43. The ratio of the product of the concentration of products to the product of the concentration of reactants is called




44. In equilibrium constant expression, the concentration of reactants is taken in/on the




45. Unit of the equilibrium constant for CO + 2H2 CH3OH is




46. What is represented by each figure within a square bracket in the equilibrium expression?




47. In equilibrium constant expression, the concentration of products is taken in/on the




48. Unit of equilibrium constant for H2 + I2 2HI is




49. What is the representation of a reversible reaction?




50. The rate at which the reaction proceeds is directly proportional to the product of the active masses of




51. Which of the following is the correct representation for active mass?




52. Unit of the equilibrium constant for H2 + CO2 H2O + CO is




53. What percentage of ammonia is given after cooling the equilibrium mixture by the Haber process?




54. Due to the high concentration of reactants, the rate of the forward reaction is




55. In the reverse reaction SO3 decomposes in to




56. Unit of the equilibrium constant for N2 + O2 2NO is




57. The relationship by which the values that relate amounts of products to reactants at equilibrium can be determined is called




58. The term active mass shows the concentration of reactants and products in




59. The equilibrium constant can be used to determine the equilibrium concentration of equilibrium mixture knowing the




60. When diluting acid always add




61. The state at which forward and reverse reactions occur at the same rate is




62. Which of the following is used as a catalyst in the contact process?




63. Which process is used for the large scale production of sulphuric acid?




64. The rate at which the reaction proceeds is directly related to




65. Unit of the equilibrium constant for 2NO + O2 2NO2 is




66. Unit of equilibrium constant for PCl5 PCl3 + Cl2




67. What is denoted by the subscript c in Kc?




68. What percentage of ammonia is produced at equilibrium by the Haber process?




69. In Habers process, the amount of ammonia yields is




70. What is established when the rate of evaporation equals the rate of condensation?




71. The rate at which a substance reacts is directly proportional to its




72. The reactions in which reactants react to form products and simultaneously products reverse back into reactants are called




73. The equilibrium constant can be used to




74. The process by which ammonia is produced by the reaction of nitrogen with hydrogen at 200 atm pressure and in the presence of a catalyst is called




75. If a change is imposed in concentration, temperature or pressure on a chemical system at equilibrium, the system responds in a way that the change is




76. Which of the following statements about catalysts is not true?




77. A substance which increases the rate of reaction is called




78. If the concentration, temperature, and pressure is changed, the system responds in a way that




79. The conditions for equilibrium of concentration of reactant and products will be the same if




80. A reversible reaction




81. What is the term used for a state of a chemical reaction in which forward and reverse reactions take place at the same rate?




82. Which of the following has made it possible to get the maximum amount of products?




83. Unit of the equilibrium constant for N2O4 2NO2 is




84. Which of the following statements about the equilibrium constant is not true?




85. The law of mass action was proposed by




86. Which of the following reactions causes acid droplets to spew in all directions?




87. Kf and Kr are




88. Substances which increase the rate of a chemical reaction are called




89. The ratio of the product of the concentration of products to the product of the concentration of reactants is called




90. In equilibrium constant expression, the concentration of reactants is taken in/on the




91. Unit of the equilibrium constant for CO + 2H2 CH3OH is




92. What is represented by each figure within a square bracket in the equilibrium expression?