12th class (Fsc) Chemistry unit 5 MCQs
51. The refrigeration capacity of liquid Ne is greater than liquid He by:
a. 40%
b. 20%
c. 50%
d. 30%
52. which noble gas is present on the earth due to radioactive decay?
a. Xe
b. Kr
c. Rn
d. Ar
53. Which noble gas is the a-decay product of the radium?
a. Xe
b. Kr
c. Rn
d. Ar
54. Which among the following is most polarized noble gas?
a. Xe
b. Kr
c. Rn
d. Ar
55. The fluorides of Xe are:
a. Coordinate covalent
b. Ionic
c. Metallic
d. Covalent
56. Which product is formed, when XeF6 hydrolyzed slowly?
a. XeO4
b. XeOF4
c. XeF2
d. XeO3
57. Which product is formed, when XeOF, hydrolvsed slowly?
a. XeO4
b. XeOF4
c. XeF2
d. XeO3
58. Which of the following hydrogen halide is the weakest acid in solution?
a. HI
b. HF
c. HCL
d. HBr
59. Chlorine heptaoxide (CI2O7) reacts with water to form:
a. Perchloric acid
b. Hypochlorous acid
c. Chlorine and oxygen
d. Chloric acid
60. Hydrogen bond is the strongest between the molecule of:
a. HBr
b. HF
c. HI
d. HCL
61. Which halogen will react spontaneously with Au(s) to produce Au3+ ?
a. I2
b. Br2
c. CI2
d. F2
62. The anhydride of HCIO4 is:
a. CI2O5
b. CIO3
c. CI2O7
d. CIO2
63. Bleaching powder may be produced by passing chlorine over:
a. Anhydrous calcium sulphate
b. Calcium carbonate
c. Calcium hydroxide
d. Hydrated calcium sulphate
64. Which is the strongest acid?
a. HCIO3
b. HCIO
c. HCIO4
d. HCIO2
65. Which halogen occurs naturally in a positive oxidation state?
a. Bromine
b. Fluorine
c. Iodine
d. Chlorine
66. An element that has high ionization energy and tends to be chemically inactive would most likely to be:
a. Noble gas
b. An alkali metal
c. A halogen
d. A transition element
67. Which of the following represents the correct electronic configuration of the outermost energy level of an element of zero (VIIIA) group in the ground state.
a. s2p5
b. s2p2
c. s2p6
d. s2p4
68. Which halogens occurs naturally in a positive exidation state?
a. Bromine
b. Fluorine
c. Iodine
d. Chlorine
69. The lement which cause burn to skin that heels slowly:
a. Br2
b. F2
c. Acid
d. CI2
70. Among the given ionic halides which one have highest melting and boiling points:
a. Fluorides
b. Iodides
c. Chlorides
d. Bromides
71. Most powerful oxidizing agent:
a. F2
b. CI2
c. I2
d. Br2
72. Hydrogen bond is the strongest between the molecule of;
a. HBr
b. HF
c. HI
d. HCL
73. Strongest reducing agent is:
a. HCL
b. HF
c. HI
d. HBr
74. which of the following halides is the weaker acid is solution?
a. HI
b. HF
c. HCL
d. HBr
75. Halogen acid in gaseous state found as equilibrium mixture of monomer cyclic hexamer is:
a. HBr
b. HF
c. HI
d. HCL