Chemistry Objective_Questions Phase I to III

61. The hardness of water is usually expressed in

(A) ppm                                                           (B) g/litre

(C) mol/litre                                                     (D) litre/gm

 

62. Avogadro’s number is the no. of molecules present in

(A) 22.4 litre of a gas at NTP                          (B) 1 mole of a substance

(C) g mole weight of a substance                   (D) All

 

63. How many g of glucose (C₆H₁₂O₆) be dissolved to make one litre solution of 10% glucose.

(A) 10g                                                            (B) 180g

(C) 100g                                                          (D) 1.8g

 

64. The molarity of pure water is

(A) 55.6                                                           (B) 50

(C) 100                                                            (D) 18

 

65. The equivalent weight of MnSO₄ is half of its molecular weight when it is converted to

(A) Mn₂O₃                                                       (B) MnO₂

(C) MnO₄                                                        (D) MnO₄^–2

 

66. Which does not have linear shape

(A) CO₂                                                           (B) CH₄

(C) C₂H₂                                                          (D) HgCl₂

 

67. K⁺, Cl^–, Ca⁺², S^–2 ions are isoelectronics. The decreasing order of size is

(A) S^–2 > Cl^– > K⁺ > Ca⁺²                                (B) Ca⁺² > K⁺ > Cl^– > S^–2

(C) K⁺ > Cl^– > Ca⁺² > S^–2                                (D) Cl^– > S^–2 > Ca⁺² > K⁺

 

68. In HCHO carbon atom has hybridisation

(A) sp                                                              (B) sp²

(C) sp³                                                             (D) sp³d

 

69. Which has the largest first ionization energy

(A) Li                                                               (B) Na

(C) K                                                                (D) Rb

 

70. 2Fe⁺³_(aq) + Sn⁺²_(aq) ¾® 2Fe⁺²_(aq) + ?

The missing term in this reaction is

(A) Sn⁺⁴                                                           (B) Sn⁺²

(C) Sn                                                              (D) Sn⁺⁷

 

71. A certain buffer solution contains equal concentration of X^– and HX. The K_b for X^– is 10^–10. The pH of the buffer is

(A) 4                                                                (B) 7

(C) 10                                                              (D) 14

 

72. The conjugate base of H₃⁺O is

(A) H⁺                                                              (B) H₂O

(C) H₂O₂                                                         (D) H^–

 

73. The Cu⁺⁺ ion is

(A) Weakly acidic                                           (B) Weakly basic

(C) neither acidic non basic                            (D) strongly acidic

 

74. What is the increasing order of acidity among the following compounds

(i) HI                                                                (ii) HF

(iii) HCl                                                            (iv) HBr

(A) ii < iii < iv < i                                               (B) i < ii < iii < iv

(C) i < iv < iii < ii                                               (D) iii < ii < iv < i

 

75. Which one is the strongest acid?

(A) HOCl                                                         (B) HOClO

(C) HOClO₂                                                    (D) HOClO₃

 

76. The rate constant of reaction depends upon

(A) temperature                                              (B) initial concentration

(C) time of reaction                                         (D) extent of reaction

 

77. Conjugate base of is

(A) NH₃                                                           (B) H₂O

(C)                                                           (D)

 

78. The equilibrium of the reaction N₂(g) + 3H₂(g) 2NH₃(g) will shift to product side when

(A) K_p > 1                                                        (B) Q < K_p

(C) Q = K_p                                                       (D) Q = 2K_p

 

79. It is found that equilibrium constant increases by a factor of four when the temperature is increased from 25°C to 40°C. The value of DH is

(A) 25.46 kJ                                                    (B) 171.67 kJ

(C) 89.43 kJ                                                    (D) 71.67 kJ

 

80. Which of the following is true for the equilibrium of the reaction

C(s) + H₂O(g)  CO(g) + H₂(g)

(A)                                                 (B)

(C)                                              (D)

 

81. The widely used plastic, PVC is polymerisation product of

(A) CH₂=CH₂                                                  (B) CF₂ = CF₂

(C) CH₂ = CH—CH₂—Cl                               (D) CH₂=CH—Cl

 

82. Each of the following compound is expected to be optically active except

(A)		(B)
(C)	methyl-2-methyl propanoate	(D)	methyl-2-chloro propanoate

 

83. Acetyl acetone can exhibit one of the following kind of isomerism

(A) Metamerism                                              (B) Optical activity

(C) tautomerism                                              (D) Ring  chain isomerism

 

84. What is the end product of the following sequence of operations

CaC₂ A  B

(A) Methyl alcohol                                           (B) Acetaldehyde

(C) Ethyl alcohol                                             (D) Ethylene

 

85. Arrange the following in decreasing order of basicity

 

 

(A) I > II > IV > III                                             (B) III > IV > I > II

(C) IV > I > III > II                                            (D) IV > III > I > II

 

86. Molecule in which distance between the two adjacent carbon atoms is largest is

(A) Ethane                                                       (B) Ethene

(C) Ethyne                                                       (D) Benzene

 

87. Arrange the following in order of decreasing enol content

 

 

(A) II > I > IV > III                                             (B) I > II > III > IV

(C) IV > III > II > I                                            (D) IV > I > II > III

 

88.
		(A)		(B)
		(C)		(D)

 

 

89. The correct statement about the compounds A, B and C is

 

 

(A) A and B are homomers                            (B) A and B are diastereomers

(C) A and C are enantiomers                         (D) A and B are enantiomers

 

90. The hydrocarbon which decolourises alkaline KMnO₄ solution, but does not give any precipitate with ammoniacal AgNO₃ is

(A) Benzene                                                    (B) Acetylene

(C) Propyne    (D) 2-Butyne

 

ANSWERS

 

61. A 62.       D                     63.       C                     64.       A        
62. B                     66.       B                     67.       A                     68.       B                    
63. A 70.       A                     71.       A                     72.       B        
64. A 74.       A                     75.       D                     76.       A
65. A 78.       B                     79.       D                     80.       A        
66. D                     82.       C                     83.       C                     84.       B        
67. D                     86.       A                     87.       A                     88.       C
68. D                     90.       D