Chemistry Class 10th English Medium Chapter 9 Chemical Equilibrium Notes MCQs Questions Bank

chemistry 10th notes Chapter No 9

1. The properties of reversible reaction are the following except.

 
 
 
 

2. The response in which all the reactants had been turned into products are known as

 
 
 
 

3. In chemical reactions the substances that combine are known as :

 
 
 
 

4. When H, and O₂ combine they form

 
 
 
 

5. Name the reactants in this equation. 2H₂+O₂ pt/heat  2H₂O

 
 
 
 

6. The product formed by the reaction of CaO and CO₂ is:

 
 
 
 

7. Which among the following scientists presented the law of mass action.

 
 
 
 

8. Forward reaction takes place from:

 
 
 
 

9. Nitrogen and hydrogen were reacted together to make ammonia as: N₂+3H₂⇆2NH₃ What will be present in the equilibrium mixture?

 
 
 
 

10. In course of a reaction, reaction is at equilibrium then:

 
 
 
 

11. Nitrogen is used to prepare:

 
 
 
 

12. Oxygen is used to prepare:

 
 
 
 

13. Dynamic means reaction i:

 
 
 
 

14. When the magnitude of Kc is very large it indicates

 
 
 
 

15. By knowing the value of equilibrium constant can be predicted:

 
 
 
 

16. Rate of forward reactions takes place at the rate of reverse reaction, the composition of the reaction mixture remains constant is called

 
 
 
 

17. There are possibilities of predicting extent of reaction ,

 
 
 
 

18. In extent of reaction, the reaction never is going to completion have:

 
 
 
 

19. Consider the reaction 2H₂+O₂⇌2H₂O. Which of the following correctly states the expression for the equilibrium constant for this reaction?

 
 
 
 

20. For the reactions H₂ + I₂ ➝2HI. The reactions quotients for this reactions is

 
 
 
 

21. The reaction quotient is useful as it predicts the direction of reaction through comparing the value of

 
 
 
 

22. The colour of iodine is:

 
 
 
 

23. For reaction between H₂ and I₂ to form HI, the units of Kc are

 
 
 
 

24. A chemical reaction has reached dynamic equilibrium at a certain temperature.Which one of the following statements is incorrect?

 
 
 
 

25. The colour of hydrogen Iodide is:

 
 
 
 

26. Numerical value of Kc predicts :

 
 
 
 

27. Reversible reactions takes place in:

 
 
 
 

28. The lives of aquatic animals and plants are not directly associated with concentration of dissolved in water:

 
 
 
 

29. Nitrogen and oxygen constituents’ of the atmosphere:

 
 
 
 

30. When H and I Combine they form

 
 
 
 

31. The response in which the products do not recombine to from reactants is known as:

 
 
 
 

32. There are _characteristics of dynamic equilibrium

 
 
 
 

33. The reaction in which products can recombine to form reactants is called:

 
 
 
 

34. Many environmental systems depend for their:

 
 
 
 

35. The characteristics of reversible reactions are following except:

 
 
 
 

36. All of the given are characteristics of reversible reaction, except that:

 
 
 
 

37. In course of reaction, the reaction goes to completion have:

 
 
 
 

38. The oxidation of carbon monoxides is going to completion at

 
 
 
 

39. Reverse reaction take place from:

 
 
 
 

40. The equilibrium constant Kc is:

 
 
 
 

41. For a reaction between PCl₃ and Cl₂ to form PCl5, the units of Kc are

 
 
 
 

42. Nitrogen and oxygen gasses are b used for manufacturing chemicals since the advent of century:

 
 
 
 

43. Reverse reactions – gradually.

 
 
 
 

44. An equilibrium is achievable only in

 
 
 
 

45. A reactions in which the products recombine to form reactants are known as:

 
 
 
 

46. Kc has _____ units in reactions with equal number of moles on both sides

 
 
 
 

47. Irreversible reaction goes on:

 
 
 
 

48. In course of a reaction, reaction proceeds forward then:

 
 
 
 

49. At equilibrium the rate of forward and reverse reaction will be .

 
 
 
 

50. Irreversible reaction consists of:

 
 
 
 

51. At the early stage the rate of forward reaction is.

 
 
 
 

52. Which of the following statement is correct about reverse reaction? 

 
 
 
 

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

 
 
 
 

54. Which statement is incorrect about reverse reaction?

 
 
 
 

55. Ammonia is used to manufacture :

 
 
 
 

56. When reaction ceases to proceed it is called:

 
 
 
 

57. In the beginning reverse reactions is

 
 
 
 

58. As the numeric value of Qc is less than Kc the reaction is not

 
 
 
 

59. At equilibrium state, when reaction ceases to proceed, it is called

 
 
 
 

60. When the magnitude of Ke is very large it indicates.

 
 
 
 

61. There are possibilities at equilibrium state.

 
 
 
 

62. In an irreversible reaction, dynamic equilibrium

 
 
 
 

63. In the lime kiln, the reaction
CaCO₃ ———–>CaO + CO₂
Goes to completion because:

 
 
 
 

64. Reaction in which reactants react to form products are known as :

 
 
 
 

65. Point out the coefficient among the following hypothetical reactions 2A+3 D ➝ 4C+8D

 
 
 
 

66. The unit of molar concentration is:

 
 
 
 

67. The two major components of atmosphere are:

 
 
 
 

68. Irreversible reaction represented by a .. between a reactant and a product:

 
 
 
 

69. Gases are being used to manufacture: :

 
 
 
 

70. When the system A + B ⇌ C + D is at equilibrium

 
 
 
 

71. When the magnitude of Kc is very small it indicates:

 
 
 
 

72. Which of the following statement is incorrect about active mass?

 
 
 
 

73. An active mass is considered as the molar concentrations in units of

 
 
 
 

74. Sulphur dioxide is used to manufacture:

 
 
 
 

75. The ratio of product concentration of products raised to power of co-efficient to the  products of reactant raised to the power co-efficient is called .

 
 
 
 

76. Reactions which have comparable amounts of reactants and products at equilibrium state have:

 
 
 
 

77. When a system is at equilibrium state:

 
 
 
 

78. At equilibrium state the physical characteristics like density, colour etc:

 
 
 
 

79. Reversible reaction:

 
 
 
 

80. Law of mass action was given by

 
 
 
 

81. When CaO reacts with CO₂ they produce:

 
 
 
 

82. Which is the king of chemicals:

 
 
 
 

83. In course of a reaction, reaction proceeds reverse then:

 
 
 
 

84. Equilibrium constant is represented by:

 
 
 
 

85. Reaction quotient is expressed as:

 
 
 
 

86. For the reaction 2A + B ⇌ 3C, the expression of equilibrium constant is

 
 
 
 

Short Questions

1. An industry was established based upon a reversible reaction. It failed to achieve products on commercial level. Can you point out the basic reasons of its failure being a chemist?
2. Define a reversible reactions.
3. Define active mass. How is it represented?
4. Define Bronsted-Lowry acid.
5. Define chemical equilibrium state
6. Define dynamic equilibrium.
7. Define the Law of Mass Action.
8. Derive equilibrium constant express-ion for the synthesis of ammonia from nitrogen and hydrogen.
9. Derive Kc units for given equation N₂+3H₂⇌2NH₃
10. Differentiate between irreversible reactions and reversible reactions. 
11. Differentiate between reactants and products.
12. Environmental systems depend upon equilibrium phenomena. Explain.
13. Give the characteristics of reversible reaction.
14. Give the chemical equation for reversible reaction on heating CaCO₃ in a closed system.
15. Give the expression of Kc for following reaction N₂+3H₂⇌2NH₃
16. How can direction of a reaction be predicted?
17. How can you know that a reaction has achieved an equilibrium state?
18. How does large numerical value of Kc help us to predict the extent of a chemical reaction?
19. How does small numerical value of Kc help us to predict the extent of a chemical reaction?
20. How is dynamic equilibrium established?
21. How is the active mass represented?
22. How would you define Arrhenius base?
23. If a reaction has large value of Kc, will it go to completion and why?
24. If reaction quotient Qc of a reaction is more than Kc. What will be the direction of the reaction?
25. Kc has no unit for given reaction H₂+I₂⇌2HI. Give reasoning. 
26. Name the factors that can disturb chemical equilibrium.
“27. Point out the coefficients in the following hypothetical reaction:
2A+3B ⇌ 4C + 2D”
“28. Point out the coefficients in the following hypothetical reaction:
2M + 4N ⇌ 5O”
“29. Point out the coefficients in the following hypothetical reaction:
4x ⇌ 2Y + 3Z”
30. State the law of mass action.
31. State the macroscopic characteristics of reverse reaction.
32. What are irreversible reactions?
33. What are irreversible reactions? Give a few characteristics of them.
34. What are the characteristics of a reaction that establishes equilibrium state at once?
35. What do you mean by equilibrium constant?
36. What do you mean by the extent of a reaction?
37. What happens to the composition of reaction mixture when chemical equilibrium is achieved?
38. What is a complete reaction? How it is represented? 
39. What is a static equilibrium? Explain with an example.
40. What is active mass? Also write its units.
41. What is meant by dynamic equilibrium state?
42. What is static equilibrium?
43. What is the relationship between active mass and rate of reaction?
44. What type of system is required to maintain chemical equilibrium? 
45. When CaCO₃ is heated in an open flask, the reaction is irreversible. Give reasoning.
46. Which physical factor effects the value of Kc?
47. Which types of reactions do not go to completion?
48. Why at equilibrium state reaction does not stop?
49. Why is equilibrium achievable only in a closed system?
50. Why reversible reactions never complete?
51. Why the amounts of reactants and products do not change in a reversible reaction?
52. Why the amounts of reactants and products don’t change at equilibrium in a reversible reaction?
53. Why the reaction does not stop at equilibrium state?
54. Why the reaction mixture does not have 50 percent reactants and 50 percent products at equilibrium position?
55. Why the reversible reactions do not go to completion?
56. Write equation for forward reaction between hydrogen and iodine
57. Write macroscopic characteristics of forward reaction.
“58. Write the equilibrium constant expression for the following reactions:
CO(g)​+3H₂( g)​⇌CH₄( g)​+H₂​O(g)​”
“59. Write the equilibrium constant expression for the following reactions:
H₂( g)​+I₂( g)​⇌2HI(g)​”
“60. Write the equilibrium constant expressions for the following reaction
PCl₃ + Cl₂ ⇌ PCl₄”
61. Write the equilibrium constant expressions for the following reaction: 2SO₂ + O₂ ⇌ 2SO₃
“62. Write the equilibrium constant expressions for the following reaction:
2NO₂ ⇌ N₂O₄”
63. Write the expression of equilibrium constant for general reaction : A+B⇌C+D
64. Write the importance of equilibrium constant.

Long Questions

1. Compare the macroscopic characteristics of forward and reverse reactions.
2. Define reversible reactions. Write their four characteristics.
3. Derive equilibrium constant for a general reaction.
4. Differentiate between forward and reverse reactions. 
5. Explain equilibrium constant and write its units with example.
6. Give the macroscopic characteristics of forward reaction.
7. Give the macroscopic characteristics of reverse reaction.
8. How can extent of reaction be predicted by equilibrium constant?
9. How do you predict the direction of reaction with the help of equilibrium constant?
10. State and explain law of mass action.
11. State law of mass of action. Derive equilibrium constant for a general reaction.
12. What is the importance of equilibrium constant?
13. Write down the macroscopic characteristics of Dynamic equilibrium.

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