## March 07, 2015

### ONLINE TEST - Chemical equilibrium – II - EM

This Quiz is a Simple test for +2 Science group students which contain Questions asked from March - 2006 to Sept - 2016 in Chemical equilibrium – II. Just participate in it and test your skill.

1. 2H2O(g) +  2Cl2(g) 4HCl(g) +  5O2(g), the value of Kp and Kc , the value of Kp and Kc are related as
2. Kp = Kc
Kp > Kc
Kp < Kc
Kp = Kc = 0

3. For a homogenous gaseous reaction at 600 K 4NH3(g) + 5O2(g)  4NO(g) + 6H2O(g) the
4. (mol dm–3)–1
mol dm–3
(mol dm–3)4
(mol dm–3)–2

5. In an endothermic equilibrium reaction, if K1 and K2 are the equilibrium constants at T1 and T2
6. K1 < K2
K1> K2
K1 = K2
None

7. Forward reaction takes place, when
8. Q < Kc
Q > Kc
Q = Kc
Kc = 1/Q

9. H2(g) + I2(g) 2HI(g) The equilibrium constant Kc for this reaction is 16. Kp value is
10. 1 / 16
4
64
16

11. If the equilibrium constant for the formation of a product is 25, the equilibrium constant for
12. 25
1 / 25
5
625

13. If the equilibrium constants of the following reactions 2A B is K1 and B 2A is K2, then
14. K1 = 2K2
K1 = 1 / K2
K2 = (K1)2
K1 = 1 / K22

15. In a reaction 2O3  3O2 the value of Kc is
16. [O3]3 / [O2]2
[O2]2 / [O3]3
[O2]3 / [O3]2
[O3] / [O2]

17. In the equilibrium N2 + 3H2  2NH3, the maximum yield of ammonia will be obtained with the pro
18. low pressure and high temperature
low pressure and low temperature
high temperature and high pressure
high pressure and low temperature

19. In the Haber process the yield of ammonia is greater
20. at high pressure
at low pressure
at high temperature
in absence of catalyst

21. In the reversible reaction 2HI(g) H2(g) + I2(g), Kp  is
22. greater than Kc
less than Kc
equal to Kc
0 / zero

23. In the synthesis of NH3 between N2 and H2 reaction the unit of Kc is
24. lit2 mol–2
atm–2
lit atm–1
atm– l

25. State of a chemical equilibrium is
26. dynamic
stationary
both (a) and (b)
none of these

27. The equilibrium constant for the reaction 2A B is 25 mol1 dm3 at 900 K. What is the equilibrium constant for the reaction B 2A in dm3 mol at the same temperature?
28. 25
625
0.04
0.4

29. The fraction of total moles of reactant dissociated is called
30. dissociation equilibrium
degree of association
degree of dissociation
dissociation constant

31. The maximum yield of ammonia by Haber’s process is
32. 78%
97%
37%
89%

33. The optimum temperature used in contact process for the manufacture of SO3 is
34. 400°C to 450°C
1800°C to 2700°C
500°C to 550°C
350°C to 450°C

35. The rate constant of the forward and reverse reactions are 8 x 105 and 2 x 104 respectively.
36. 0.04
0.02
0.2
0.4

37. The relationship between Kp and Kc for the equilibrium 2H2O(g) + 2Cl2(g) 4HCl(g) + O2(g) is
38. Kp = Kc
Kp = Kc(RT)2
Kp = Kc(RT)1
Kp = Kc(RT)–2

39. Two moles of ammonia gas are introduced into a previously evacuated 1.0 dm3 vessel in which it partially dissociates at high temperature. At equilibrium 1.0 mole of ammonia remains. The equilibrium constant Kc for the dissociation is
40. 27 / 16 (mole dm–3)2
27 / 8 (mole dm–3)2
27 / 4 (mole dm–3)2
none of these

41. When Δng in a homogenous gaseous equilibrium is positive, then / If Δng is positive
42. Kp = Kc
Kp > Kc
Kc > Kp
Kp = 2Kc

43. Which of the following gaseous equilibria is favoured by increase in temperature?
44. N2O4 ⇌ 2NO2; ΔH = + 59 kJ mol–1
N2 + 3H2 ⇌ 2NH3; ΔH = – 22 kcalmol–1
2SO2 + O2 ⇌ 2SO3; ΔH = – 47 k cal mol–1
Both (b) and (c)

45. Which one of the following has negative value for Δng?
46. H2(g) + I2(g) ⇌ 2HI(g)
PCl5(g) ⇌ PCl3(g) + Cl2(g)
3H2(g) + N2(g) ⇌ 2NH3(g)
2H2O(g) + 2Cl2(g) ⇌ 4HCl(g) + O2(g)

47. In an equilibrium reaction, when Q < Kc then
48. forward reaction is favoured
reverse reaction is favoured
both forward and reverse reaction are favoured
none of these

49. In which of the following gaseous reaction Kp < Kc?
50. PCl5(g) ⇌ PCl3(g) + Cl2(g)
H2(g) + I2(g) ⇌ 2HI(g)
N2(g) + 3H2(g) ⇌ 2NH3(g)
CO(g) + H2O(g) ⇌ CO2(g) + H2(g)

51. In the formation of HI from H2 and I2, Kp = Kc  because
52. Δng = 2
Δng = 1
Δng = 0
Δng = –1

53. Presence of moisture in contact process
54. activates the catalyst
deactivates the catalyst
increases the product
makes the catalyst porous

55. The maximum yield of SO3 in contact process is
56. 97%
37%
50%
47%

57. The mole ratio of SO2 and O2 in contact process is
58. 1 : 2
2 : 1
3 : 1
1 : 3

59. For the Equilibrium PCl5(g) ⇌ PCl3(g) + Cl2(g) the factor that favours the reverse reaction is
60. Increase in concentration of PCl5
Increase in concentration of Cl2
No change in concentration of Cl2
Decrease in concentration of Cl2

61. The pressure required to get maximum yield of Ammonia by Haber's process
62. 300 - 500 atm
500 - 700 atm
700 - 1200 atm
100 - 300 atm

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