Chemistry 13_Objective_Phase IV to VI

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61. The dissociation energy of CH₄ and C₂H₆ are respectively 360 and 620 kcal/mol. The bond energy of C – C bond (kcal/mol) is

(A) 260                                                            (B) 180

(C) 130                                                            (D) 80

62. , p₁ and p₂ are pressure, cell reaction will be spontaneous if

(A) p₁ = p₂                                                       (B) p₁ > p₂

(C) p₂ > p₁                                                       (D) p₁ = 1 atm

63. Cu⁺ + e^– ¾® Cu, E⁰ = x₁ Volt, Cu²⁺ + 2e^– ¾® Cu, E⁰ = x₂ Volt,

For Cu²⁺ + e^– ® Cu⁺, E⁰ will be

(A) x₁ – 2x₂                                                                       (B) x₁ + 2x₂

(C) x₁ – x₂                                                       (D) 2x₂ – x₁

64. + 8H⁺ + 5Fe²⁺  5Fe³⁺ + Mn²⁺+ 4H₂O,  = 0.0591, hence equilibrium constant is

(A) 0.0591                                                       (B) 100

(C) 1000                                                          (D) 10⁵

65. For octahedral void and tetrahedral void, radius ratio is (in close packing)

(A)                                                        (B)

(C) 0.225 ´ 0.414                                            (D) None

66. A hypothetical metal (atomic weight = 400) depending on temperature crystallizes in FCC and BCC structures. The ratio of densities in FCC to BCC is

(A) 2                                                                (B) 0.5

(C)                                                        (D)

67. The element which would be extracted by electrolytic reduction of its oxide dissolved in a high temperature melt is

(A) Na                                                             (B) Mg

(C) F                                                                (D) Al

68. P, P is major product. So P is

(A)                                 (B)

(C) CH₃  – CH₂ – CH₂ – CHO                        (D) None

69. Cannizzaro reaction will not be given by

70. X will

(A) reduce Tollen’s reagent                            (B) give iodoform test

(C) give cannizzaro reaction                           (D) all the above

73. Which of the following compounds will give iodoform test

(A) 2-hydroxy propane                                   (B) benzophenone

(C) methyl acetate                                          (D) acetamide

74. X is a higher phenol and Y is an aromatic carboxylic acid. Separation of a mixture of X and Y can be carried out easily by having a solution in

(A) NaOH                                                        (B) Na­₂CO₃

(C) Lime                                                          (D) NaHCO₃

75. Methyl tert butyl ether on heating with HI of one molar concentration gives

(A) CH₃I + (CH₃)₃COH                                  (B) CH₃OH + (CH₃)₃I

(C) CH₃I + (CH₃)₃CI                                       (D) None

76. Benzenediazonium chloride on reaction with phenol in weakly acidic medium gives

(A) Diphenyl ether                                           (B) p-hydroxyazobenzene

(C) chlorobenzene                                          (D) benzene

77. Acetamide reacts with NaOBr in alkaline medium to form

(A) NH₃                                                           (B) CH₃NH₂

(C) CH₃CN                                                      (D) CH₃CH₂NH₂

78. After the reaction of sodium benzene sulphonate with NaOH, it is hydrolysed by acid, the compound produced is

(A) phenol                                                       (B) benzoic acid

(C) benzene                                                    (D) disodium benzaldehyde

79. The correct order of acidic strength of following

(I) o-nitrophenol, (II) phenol, (III) 2, 4, 6-Trinitrophenol (IV) 2, 4-dinitrophenol will be

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

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

81. Which nitrogen oxide is obtained by treating copper with cold dil. HNO₃

(A) N₂O₅                                                         (B) NO₂

(C) NO                                                            (D) N₂O

82. Butane nitrile may be prepared by heating

(A) Propyl alcohol with KCN                           (B) Butyl alcohol with KCN

(C) Butyl chloride with KCN                            (D) Propyl chloride with KCN

83. One of the constituent of german silver is

(A) Ag                                                              (B) Cu

(C) Mg                                                             (D) Al

84. In the metallurgy of iron, when limestone is added to blast furnace, the calcium ions ends up as

(A) Slag                                                           (B) Gangue

(C) Metallic calcium                                        (D) CaCO₃

85. On heating NaCl + K₂Cr₂O₇ + H₂SO₄ conc., the gas that comes out is

(A) CrO₂Cl₂                                                     (B) CrOCl­­₂

(C) Cl₂                                                             (D) O₂

86. Which of the following pairs of ions cannot be separated by H₂S in the presence of dil. HCl acid.

(A) Bi³⁺, Sn⁴⁺                                                  (B) Al³⁺, Hg²⁺

(C) Zn²⁺, Cu²⁺                                                 (D) Ni²⁺, Cu²⁺

87. In [Cr(H₂O)₆]³⁺ ion central metal ion has d-electrons equal to

(A) 2                                                                (B) 3

(C) 4                                                                (D) 5

88. Which complex is diamagnetic

(A) [Fe(CN)₆]^4–                                               (B) [Cu(NH₃)₄]²⁺

(C) [Ti(H₂O)₆]³⁺                                               (D) None

89. A solution containing 500g of a protein per litre is isotonic with a solution containing 3.42 g of sucrose per litre. The molecular mass of protein is

(A) 5                                                                (B) 146

(C) 34200                                                        (D) 50000

90. The hydrogen electrode is dipped in a solution of pH = 3 at 25°C. The reduction potential of cell would be

(A) 0.177 V                                                      (B) – 0.177 V

(C) – 0.087 V                                                   (D) – 0.059 V

answers

61. D                                     62.        B                                                
62. D                                     64.        D                                     65.        A
63. A                                     67.        D                                     68.        C               
64. A                                     70.        D                                     71.        A
65. B                                     73.        A                                     74.        D               
66. B                                     76.        B                                     77.        B
67. A                                     79.        B                                     80.        D               
68. C                                     82.        D                                     83.        B
69. A                                     85.        A                                     86.        A               
70. B                                     88.        A                                     89.        D
71. B