12th class (Fsc) Chemistry unit 6 MCQs
51. The color of Cr+3 ion is:
a. Pink
b. Violet
c. Green
d. Blue
52. Chromyl chloride test is performed to conform:
a. I+ radical
b. CI– radical
c. Br radical
d. None of these
53. The color of KMnO4 crystals is:
a. Green
b. Blue
c. Dark purple
d. Yellow
54. The color of KMnO4 solution is:
a. Green
b. Blue
c. Dark purple
d. Deep pink
55. The color of K2 MnO4 solution is:
a. Green
b. Blue
c. Dark purple
d. Deep pink
56. Acidified KMnO4 solution is decolorized by:
a. HCL solution
b. Mohr’s salt solution
c. KOH solution
d. NaCI solution
57. Acidfied KMnO4 solution acts as:
a. Precipitating agent
b. Oxidizing agent
c. Dehydratting agent
d. Reducing agent
58. The m.p of K2O2O7 is:
a. 396oC
b. 250oC
c. 360oC
d. 296oC
59. What is solubility of KMnO4 in water at 20oC?
a. 9%
b. 3%
c. 2%
d. 7%
60. What is solubility of KMnO4 in water at 63oC?
a. 25%
b. 15%
c. 30%
d. 20%
61. Which statement about KMnO4 is incorrect?
a. It is used as a disinfectant and a germicide
b. It is powerful oxidizing agent
c. Its alkaline solution on heating produces hydrogen gas
d. It is used in the preparation of many organic compounds
62. Which gas can oxidize K2MnO4 into KMnO4 ?
a. [O]
b. CI2
c. CO2
d. All of given
63. Following is non-typical transition elements, Atomic numbers are within paranthesis:
a. Cr(24)
b. Cd(48)
c. Fe(26)
d. Mo(42)
64. The non-typical transition elements is:
a. Zn
b. Cr
c. Fe
d. Mn
65. The strength of binding energy of transition depends upon:
a. Number of neutrons
b. Number of electrons pairs
c. Number of protons
d. Number of unpaired electrons
66. Group VIB of transition elements contains:
a. Cr.Mo.W
b. Zn. Cd.Hg
c. Mn.Te.Re
d. Fe.Ru.Os
67. Following property of transition elements does not vary with a regular pattern.
a. Covalent radius
b. Binding energy
c. Cationic radius
d. Melting point
68. Whch one shows paramagnetic behavior:
a. Cd3+
b. Fe2+
c. Sc2+
d. Zn2+
69. Coordination number of Cu in [PtCI(NO2 )4 (NH ] SO4 is:
a. 1
b. 2-
c. 6
d. 4
70. The coordination number of Pt in [PtCI(NO2 )4 (NH3 )4 ] is:
a. Four
b. Zero
c. Six
d. Two
71. Which set of hybird orbitals produces octahedral gemetry?
a. Dsp2
b. Dsp3
c. Sp3
d. Sp3d2
72. In [PtCI(NO2 )(NH3 )2 ]2+ , the coordination number of Pt is:
a. 4
b. 2
c. 6
d. 3
73. The percentage of carbon in different types of iron products in the order of:
a. Cast iron>steel>wrought iron
b. Cast iron> wrought iron>Steel
c. Cast iron=steel> wrought iron
d. Wrought iron>steel>cast iron
74. Mild steel contains carbon:
a. 0.2 to 0.6 %
b. 0.1 to 0.2 %
c. 0.1 to 0.6 %
d. 0.2 to 0.7 %
75. Percentage of carbon in steel is:
a. .2 to 0.6 %
b. 0.25 to 2.5 %
c. 2.0 to 4.5 %
d. 0.12 to 0.20 %