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Chapter 8
Chemical Equilibrium
1. The value of pH and poH of pure water at 25°C is approximately:
- 14
- 7
- 1 x 10-14
- 1 x 1014
2. Equilibrium constant for gaseous equilibrium is represented by:
- Ka
- K c
- Kk
- Kp
3. Conjugate acid of a very strong base is relatively:
- Very strong acid
- Weak acid
- Very weak acid
- strong acid
4. Molarity of pure water is:
- 1
- 18
- 55.5
- 6
5. The suppression of ionization of weak acid or a weak base by adding one of its own ions is known as:
- Buffer action
- Common ion effect
- Buffer capacity
- ionization effect
6. By adding NH4Cl to NH4OH solution, the ionization of NH4OH:
- Increases
- Decreases
- Remain same
- Increases 100 times
7. pH of tomato is:
- 1.2
- 4.2
- 7.2
- 9.2
8. When Kc value is small, the equilibrium position is:
- Towards left
- Towards right
- Remains unchanged
- None of these
9. A basic buffer solution can be prepared by mixing:
- A strong acid and salt with weak base
- Weak base and its salt with strong acid
- Strong base and its salt with weak acid
- Weak acid and its salt with strong ba se
10. The pOH of solution is 4. The H+ ions concentration of solution is:
- 4.0 moles/dm2
- 10-10 moles/dm3
- 0.4 moles/dm3
- 4x 104 moles/dm3
11. The concentrations of reactants and products at equilibrium are which among the following option:
- Equals
- Maximum
- Minimum
- Constant
12. The term pH was introduced by:
- Henderson
- Sorenson
- Goldstein
- Thomson
13. The relationship between Kp and Kc is given by:
- KC = Kp
- Kc = Kp Error!
- Kp = Kc (RT)n
- Kp = K (RT)n
14. The solubility of KClO3 in water is suppressed by adding which among the following option:
- NaClO3
- Nacio
- KMNO4
- KCI
15. Law of mass action was derived by Guldberg and wage in:
- 1909
- 1906
- 1846
- 1864
16. Ionization of hydrogen sulphide gas is suppressed by:
- KC
- NaCl
- HCI
- NH4Cl
17. The pH of human blood is:
- 7.0
- 4.0
- 6.5
- 7.4
18. The ionic product of water will increase if:
- H+ ions are added
- OH– ion are added
- Temperature is increased
- 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:
- Increases
- Remains constant
- Decreases
- First decreases then increases
20. Which of the following factor affects on equilibrium constant?
- Change in temperature
- Change in concentration
- Change in Pressure
- Change in volume
21. Which one of the following salt dissolves in water to form a solution with pH greater than 7?
- NaCl
- CuSO4
- Na2CO3
- NH4Cl
22. pH of milk is 6.5, its poH will be:
- 14
- 7.5
- 7
- none of these
23. The unit of equilibrium constant kc for the reaction H2 + I2 2HI is:
- Mole 1 dm3
- Mole 2 dm3
- Mole dm1
- None of these
24. Which of the following reactions will be favored to the forward direction at low pressure?
- N2 + O2 2NO
- N2 + 3H2 2NH3
- PCLs PCl3 + Cl2
- H2 + I2 2HI
25. pH of a buffer can be calculated by using:
- Moseley’s equation
- Henderson’s equation
- De-Broglie’s equation
- Bohr’s equation
26. In synthesis of ammonia by Haber’s process. The optimum condition for pressure is:
- 150-160 atm
- 170-200atm
- 200-300 atm
- 300-350 atm
27. A solution has pOH = 12 it is:
- A base
- An acid
- Neutral
- None of these
28. In the reaction N2 + 3H2 2NH3 the catalyst used is:
- Fe
- Ni
- Pt
- Pd
29. The value of equilibrium constant can predict:
- The direction of reaction
- The extent of reaction
- The effect of catalyst used
- Both the direction and extent of reaction
30. The pH of 10-3 mol dm-3 of an aqueous solution of HCl is:
- 3.0
- 2.7
- 2.0
- 1.5
31. Formation of NH3 is an exothermic reaction. Low temperature favors forward reaction. However, in Haber’s process temperature used is:
- 200°C
- 300°C
- 400°C
- 500°C
32. The unit of equilibrium constant (Kc) for the reaction:
N2 + 3H2 2NH3 H -92KJ mol-1 will be:.
- Having no unit
- Mole dm3
- Mole+2 dm
- Mole-2dm+6
33. When KCl is added to a saturated solution of KCLO3, the equilibrium is shifted to the:
- Forward direction
- Backward direction
- Not affected
- All of these
34. In which of the following reactions Kc and Kp will be equal:
- PCls PCl3 + Cl2
- N2 + 3H2 2NH3
- 2SO2 + O2 2SO3
- N2 + O2 2NO
35. When HCl is passed through saturated solution of NaCl the solubility of NaCl is:
- Increased
- Decreased
- Not affected
- None of all
36. pH of rain water is:
- 5.0
- 6.0
- 6.2
- 7.0
37. The law of mass action was given by which among following:
- D.C Down and P. Waage
- Gay-Lussaic and C.M Guldberg
- C.M Guldberg and P. Waage
- Handerson and Le-Chatelier