11th class (Fsc) chemistry Unit 8 MCQs
51. The pH of human blood is:
a. 7.35
b. 3.5
c. 8.35
d. 5.35
52. A buffer solution can be prepared by mixing:
a. Strong base and its salts with weak acid
b. Strong acid and its salt with weak base
c. Weak acid and its salts with strong base
d. Weak base and its salt with strong acid
53. The solubility product of Agcl is 2.0 nu x 10-10 mol-2 dm-6 . Themaximum concentration of Ag+1 ion in the solution is:
a. 1.0 x 10-10moldm-3
b. 2.0 x 10-10moldm-3
c. 4.0 x 10-20moldm-3
d. 1.41 x 10-5 modm-3l
54. An excess of aqueous AgNO3 is added to aqueous BaCl solution. Theprecipitate is removed off. The filtrate contains:
a. Ba+2 and NO3– only
b. Ag+2 and NO3– ions
c. Ba+2 NO3– and Cl ions\
d. Ag+ ,Ba+2and NO3–
55. When ionic product of a solution is greater than the solubility productat a particular temperature then the solution is solid to be:
a. Very dilute
b. Unsaturated
c. Super saturated
d. Staurated
56. For which system does the equilibrium constant, Kc has a units of(concentration)-1 :
a. 2NO2 ⇌ N2O4
b. N2 + 3H2 ⇌ 2NH3
c. 2HF ⇌ H2 + F2
d. H2+I2 ⇌ 2HI
57. Which statement about the following equilibrium is correct: 2SO2 + O2 ⇌ 2SO2 △H= -188.3 KJ mol-1
a. AddingV2 Os catalyst increase the equilibrium yield of Sulphur trioxide
b. The value of Kp falls with rise in temperature
c. The value of Kp is equal to Kc
d. The value of Kp falls with increase in pressure
58.The pH of 10-3 mol dm-3 of an aqueous solution of H2SO4 is:
a. 2.0
b. 3.0
c. 1.5
d. 2.7
59. Solubility product af AgCI is 2.0 x 10-10 mol2 dm-3 maximum concentration of Ag-1 ions in the solution is:
a. 1.0 x 10-10 moldm-3
b. 2.0 x 10-10 moldm-3
c. 4.0 x 10-20 moldm-3
d. 1.4 x 10-5 moldm-3
60. An excess of aqueous silver nitrate is added to aqueous barium chloride and precipitate is removed by filtration. What are main ions in the filtrate:
a. Ba+2 and NO3-1 only
b. Ag+2 and NO3-1 only
c. Ba+2 and NO3-1 and C-1
d. Ag+2 Ba+2 and and NO3???????-1`
61. In AgCl solution. some salt of NaCl is added. AgCl will be precipitateddue to:
a. Unsaturation effect
b. Solubility
c. Common effect
d. Electrolyte
62. Ka for an acid is higher, the stronger is the acidl relate to strenght an acid with pKa.
a. Higher pKa. weaker the acid
b. Lower pKa. stronger the acid
c. pKa has no relation with acid strength
d. Both a and b
63. Formation of NH3 is reversible and exothermic process, what will happen on cooling?
a. More H2 will be formed
b. More reactant will form
c. More product(NHj) will be formed
d. More N2 will form
64. A buffer solution is that which resist the change:
a. pKa
b. pOH
c. pKb
d. pH
65. The chemical substance, when dissolved in water, gives H is called:
a. Amphoteric
b. Acid
c. Neutral
d. Base
66. The pH of our blood is:
a. 7.5
b. 6.7-8
c. 7.35-7.4
d. 7.9
67. The value of equilibrium (Kc ) for the reaction 2HF(s) H2(s) F2(g) is1013 at 2000oC.
a. 7.5
b. 6.7-8
c. 7.35-7.4
d. 7.9
68. Calculate the value of Kp for this reactions:
a. 186 x 1013
b. 2 x 1013
c. 3.48 x 109
d. 1013
69. what will be the pH of a solution of NaOH with a concentration of 103 M?
a. 11
b. 3
c. 7
d. 14
70. What is the correct reaction between pH and pK7:
a. pH= pKa + log Acid/Basis
b. pH=pKa= log Acid/Basis
c. pH=pKa + log Acid/Basis
d. pH= pKa + log Acid/Basis
71. The correct presentation for Ksp? AgCl →Ag++Cl−1
a. [Ag+1] [Cl-1]
b. [AgCl] / [AgCl+1][Cl-1]
c. Kap=[AgCl]
d. [AgCl+] [Cl-1] / [AgCl]
72. Human blood maintains its pH between:
a. 7.50 – 7.55
b. 6.50 – 7.00
c. 7.35 – 7.40
d. 7.20 – 7.25
73. Values of Ksp for pb SO4 system at 25oC is equal to:
a. 1.6 x 10-8 mol2dm4
b. 1.6 x 105 mol2dm6
c. 1.6 x 10-7 mol2dm4
d. 1.6 x 10-6 mol2dm-6
74. It is experimentally found that a catalyst is used to:
a. Low the pH
b. Lower the activation energy
c. Decrease the temp of the reaction
d. Increase the activation energy
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