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Chapter 8

Chemical Equilibrium

1. The value of pH and poH of pure water at 25°C is approximately:

1. 14
2. 7
3. 1 x 10^-14
4. 1 x 10¹⁴

2. Equilibrium constant for gaseous equilibrium is represented by:

1. K_a
2. K _c
3. K_k
4. K_p

3. Conjugate acid of a very strong base is relatively:

1. Very strong acid
2. Weak acid
3. Very weak acid
4. strong acid

4. Molarity of pure water is:

1. 1
2. 18
3. 55.5
4. 6

5. The suppression of ionization of weak acid or a weak base by adding one of its own ions is known as:

1. Buffer action
2. Common ion effect
3. Buffer capacity
4. ionization effect

6. By adding NH₄Cl to NH₄OH solution, the ionization of NH4OH:

1. Increases
2. Decreases
3. Remain same
4. Increases 100 times

7. pH of tomato is:

1. 1.2
2. 4.2
3. 7.2
4. 9.2

8. When Kc value is small, the equilibrium position is:

1. Towards left
2. Towards right
3. Remains unchanged
4. None of these

9. A basic buffer solution can be prepared by mixing:

1. A strong acid and salt with weak base
2. Weak base and its salt with strong acid
3. Strong base and its salt with weak acid
4. Weak acid and its salt with strong ba se

10. The pOH of solution is 4. The H⁺ ions concentration of solution is:

1. 4.0 moles/dm²
2. 10^-10 moles/dm³
3. 0.4 moles/dm³
4. 4x 10⁴ moles/dm³

11. The concentrations of reactants and products at equilibrium are which among the following option:

1. Equals
2. Maximum
3. Minimum
4. Constant

12. The term pH was introduced by:

1. Henderson
2. Sorenson
3. Goldstein
4. Thomson

13. The relationship between K_p and Kc is given by:

1. K_C = K_p
2. K_c = K_p Error! 
3. K_p = K_c (RT)ⁿ
4. K_p = K (RT)ⁿ

14. The solubility of KClO₃ in water is suppressed by adding which among the following option:

1. NaClO₃
2. Nacio
3. KMNO₄
4. KCI

15. Law of mass action was derived by Guldberg and wage in:

1. 1909
2. 1906
3. 1846
4. 1864

16. Ionization of hydrogen sulphide gas is suppressed by:

1. KC
2. NaCl
3. HCI
4. NH₄Cl

17. The pH of human blood is:

1. 7.0
2. 4.0
3. 6.5
4. 7.4

18. The ionic product of water will increase if:

1. H⁺ ions are added
2. OH^– ion are added
3. Temperature is increased
4. H⁺ and OH^– ions are added in equal amount.

19. When HCl is added to H₂S aqueous solution, its ionization choose one among the following:

1. Increases
2. Remains constant
3. Decreases
4. First decreases then increases

20. Which of the following factor affects on equilibrium constant?

1. Change in temperature
2. Change in concentration
3. Change in Pressure
4. Change in volume

21. Which one of the following salt dissolves in water to form a solution with pH greater than 7?

1. NaCl
2. CuSO₄
3. Na₂CO₃
4. NH₄Cl 

22. pH of milk is 6.5, its poH will be:

1. 14
2. 7.5
3. 7
4. none of these

23. The unit of equilibrium constant k_c for the reaction H₂ + I₂  2HI is:

1. Mole ¹ dm³
2. Mole ² dm³
3. Mole dm¹
4. None of these

24. Which of the following reactions will be favored to the forward direction at low pressure?

1. N² + O₂   2NO
2. N₂ + 3H₂  2NH₃
3. PCL_s  PCl₃ + Cl₂
4. H₂ + I₂  2HI

25. pH of a buffer can be calculated by using:

1. Moseley’s equation
2. Henderson’s equation
3. De-Broglie’s equation
4. Bohr’s equation

26. In synthesis of ammonia by Haber’s process. The optimum condition for pressure is:

1. 150-160 atm
2. 170-200atm
3. 200-300 atm
4. 300-350 atm

27. A solution has pOH = 12 it is:

1. A base
2. An acid
3. Neutral
4. None of these

28. In the reaction N₂ + 3H₂  2NH₃ the catalyst used is:

1. Fe
2. Ni
3. Pt
4. Pd

29. The value of equilibrium constant can predict:

1. The direction of reaction
2. The extent of reaction
3. The effect of catalyst used
4. Both the direction and extent of reaction

30. The pH of 10^-3 mol dm^-3 of an aqueous solution of HCl is:

1. 3.0
2. 2.7
3. 2.0
4. 1.5

31. Formation of NH₃ is an exothermic reaction. Low temperature favors forward reaction. However, in Haber’s process temperature used is:

1. 200°C 
2. 300°C
3. 400°C
4. 500°C

32. The unit of equilibrium constant (Kc) for the reaction:

N₂ + 3H₂ 2NH₃  H  -92KJ mol^-1 will be:.

1. Having no unit
2. Mole dm³
3. Mole⁺² dm
4. Mole^-2dm⁺⁶

33. When KCl is added to a saturated solution of KCLO₃, the equilibrium is shifted to the:

1. Forward direction
2. Backward direction
3. Not affected
4. All of these

34. In which of the following reactions K_c and K_p will be equal:

1. PCl_s  PCl₃ + Cl₂
2. N₂ + 3H₂  2NH₃
3. 2SO₂ + O₂  2SO₃
4. N₂ + O₂  2NO

35. When HCl is passed through saturated solution of NaCl the solubility of NaCl is:

1. Increased
2. Decreased
3. Not affected
4. None of all

36. pH of rain water is:

1. 5.0
2. 6.0
3. 6.2
4. 7.0

37. The law of mass action was given by which among following:

1. D.C Down and P. Waage
2. Gay-Lussaic and C.M Guldberg
3. C.M Guldberg and P. Waage
4. Handerson and Le-Chatelier