61. If E⁰ (Fe³⁺/Fe) = – 0.036 V & E^0‑(Fe²⁺/Fe) = – 0.439 V, the value of E⁰ (Fe³⁺, Fe²⁺/Pt) is

(A) – 0.475 V                                                   (B) 0.403 V

(C) 0.77V                                                         (d)  0.986 V

 

62. The standard reduction potential of 2H₂O + 2e^– ¾® H₂ + 2OH^– at 298 K is

(A) 0.828 V                                                      (B) – 0.828 V

(C) 0.414 V                                                      (D) – 0.414V

 

63. If E⁰ (Fe²⁺/Fe) = – 0.44V & E⁰(Pb²⁺/Pb) = – 0.13V, then adding powdered Pb & Fe to a solution containing 1 M in each of Pb²⁺ & Fe²⁺ ions would result into the formation of

(A) more of Pb & Fe²⁺ ions                             (B) more of Fe & Pb²⁺ions

(C) more of Fe & Pb                                       (D) more of Fe²⁺ & Pb²⁺ ions

 

64. In acidic medium Cr₂O₇^2– is converted to Cr³⁺ when it acts as an oxidising agent. The quantity of electricity required to reduce 0.05 mole of Cr₂O₇^2– would be

(A) 0.05 F                                                        (B) 0.1 F

(C) 0.2 F                                                          (D) 0.3 F

 

65. The edge length of unit cell of sodium chloride is 564 pm. If the size of Cl^– ion is 181 pm, the size of Na⁺ ion would be

(A) 383 pm                                                      (B) 282 pm

(C) 101 pm                                                      (D) 202 pm

 

66. The co-ordination number of metal crystallizing in hexagonal close-packed (hcp) structure is

(A) 12                                                              (B) 10

(C) 8                                                                (D) 6

 

67. Which of the following statements is correct?

(A) The co-ordination number of each type of ion in CsCl crystal is 8

(B) A metal that crystallizes in bcc structure has a co-ordination number of 12

(C) The length of the unit cell in NaCl is 552 pm ( = 95 pm, = 181 pm)

(D) The packing fraction for bcc structure is 0.52

 

68. Copper displaces which of the metal from the salt solutions?

(A) AgNO₃                                                      (B) ZnSO₄

(C) FeSO­₄                                                       (D) All of the above

 

69. Of the following metals, which one cannot be obtained by electrolysis of the aqueous solution of its salt is

(A) Ag                                                              (B) Mg

(C) Cu                                                             (D) Al

 

70. How many electrons are there in one coulomb?

(A) 6.023 ´ 10²³                                              (B) 96500

(C) 1.6 ´ 10^–19                                                 (D) 6.24 ´ 10¹⁸

 

71. How much current is necessary to produce hydrogen gas at a rate of 1200 cc per second at NTP conditions?

(A) 96500 ampere                                           (B) 48250 ampere

(C) 8.616 ampere                                            (D) 14800 ampere

 

72. The e.m.f. of half cell PtH_­2 (2 atm) | HCl (a = 0.02) & E⁰_OP= 0 V is

(A) + 0.19 volt                                                 (B) + 0.403 volt

(C) – 0.409 volt                                               (D) – 0.109 volt

 

73. Given & . Then

(A) Ag⁺ can be reduced by H₂                        (B) Ag can oxidise H₂(g) to H⁺

(C) Zn²⁺ can be reduced by H₂                      (D) Ag can reduce Zn²⁺

 

74. The crystalline compound AxBy is characterised by a body-centered cell. The compound has the formula.

(A) AB                                                             (B) A₄B

(C) A₈B                                                            (D) AB₄

75. A solution of CuSO₄ is electrolysed using platinum inert electrodes. Due to electrolysis, the colour changes from blue to _________ and pH of the solution ________.

(A) red, unaltered                                            (B) colourless, increases

(C) blue, decreases                                         (D) colourless, decreases,

 

76. A solution of sodium sulphate is electrolysed using inert electrodes and the gases evolved are stored in a container. What is the mole fraction of gas in container which have higher concentration.

(A)                                                               (B) 0.33

(C) 2/3                                                             (D) 4/5

(E) None

 

77. The reduction potential of hydrogen half cell will be negative if

(A)  = 1 atm and [H⁺] = 1 M                      (B)  = 1 atm and [H⁺] = 2 M

(C) = 1.5 atm and [H⁺] = 1 M                    (D)  = 1.2 atm and [H⁺] = 1.2 M

 

78. A current of 1 ampere is passed through CuSO₄ solution for 965 second. What mass of Cu is deposited at cathode?

(A) 0.3175 gm                                                 (B) 0.635 gm

(C) 0.15875 gm                                               (D) 0.238 gm

 

79. 1 faraday of electricity will deposit 108 gm of silver. What is electro-chemical equivalent of the substance?

(A) 1.119 ´ 10^–3                                              (B) 2.238 ´ 10^–3

(C) 0.108                                                         (D) 1.08

 

80. The mass of unit cell of CsCl corresponds to

(A) 1Cs⁺ and 1Cl^–                                     (B) 1Cs⁺ and 6Cl^–

(C) 4Cs⁺ and 4Cl^–                                     (D) 8Cs⁺ and 1Cl^–

 

81. Which of the following is a non-crystalline solid

(A) CsCl                                                    (B) NaCl

(C) CaF₂                                                    (D) Glass

 

82. Crystals of covalent compounds always have

(A) Atoms as their structural unit

(B) Molecules as their structural units

(C) Ions held together by electrostatic force

(D) High Melting point

 

83. Tetragonal crystal system has the following unit cell dimensions

(A) a = b = c and a = b = g = 90°

(B) a = b ¹ c and a = b = g = 90°

(C) a = b ¹ c and a = b = g ¹ 90°

(D) a = b ¹ c and a = b = 90°; g = 120°

 

84. The 8:8 type of packing is present in

(A) NaCl                                                    (B) KCl

(C) CsCl                                                    (D) MgF₂

85. Given

C + 2S ¾® CS₂ DH_f⁰ = + 117.0 kJ mol^–1

C + O₂  ¾® CO₂; DH_­f⁰ = –393 kJ mol^–1

S + O₂  ¾® SO₂; DH_f⁰ = – 297 kJ mol^–1

The heat of combustion of

CS₂ + 3O₂  ¾® CO₂ + 2SO₂ is

(A) – 807 kJ mol^–1                                          (B) – 1104 kJ mol^–1

(C) + 1104 kJ mol^–1                                        (D) + 807 kJ mol^–1

 

86. If C(s) + O₂(g) ¾® CO₂(g); DH = X

and

CO(g) + O₂ (g) ¾® CO₂(g) DH = Y

Then the heat of formation of CO is

(A) X + Y                                                         (B) X – Y

(C) Y – X                                                         (D) X . Y

 

87. Heat of neutralization is highest in the reaction between

(A) HNO₃ – NH₄OH                                        (B) HCl – NaOH

(C) NH₄OH – CH₃COOH                               (D) NaOH – CH­₃COOH

 

88. The energy change of reaction

C₂H₆(g) ¾® 2C(g) + 6H(g) is X kJ

The bond energy of C – H bond is

(A) X/6 kJ                                                        (B) X/3 kJ

(C) X kJ                                                           (D) indeterminate

 

89. Which of the following describes the criterion of spontaneity

(A) DH_T, _{p > 0}                                                    (B) DS_{Total > 0}

(C) DG_­T, _P>0                                                     (D) All of these

 

90. For an endothermic reaction where DH represents the enthalpy of the reaction in kJ/mole, the minimum value for the energy of activation will be

(A) less than DH                                              (B) zero

(C) more than DH                                      (D) equal to DH

Answers

 

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