12th class (Fsc) Chemistry unit 1 MCQs
51. Metal halide in their lower oxidation state tends to be:
a. Amphoteric
b. Ionic
c. Partly covalent
d. Covalent
52. The binary compounds of hydrogen with other elements are called:
a. Carbides
b. Halides
c. Hydrides
d. Nitrides
53. Hybrides of alkaline earth metals are:
a. Coordinate covalent
b. Covalent
c. Polar
d. Lonic
54. Covalent hybrides are usually:
a. Gases
b. Liquids
c. Gases or volatile liquids
d. Solids
55. From left to right in a perios, the stability of cavalent hydrides:
a. Remains constant
b. Increases
c. First drcreases and then increases
d. Decreases
56. From top to bottom in a group the stability of cavalent hybrides:
a. Remains constant
b. Increases
c. First decrease and then increases
d. Decreases
57. The most stable hybride is formed by the element:
a. Br
b. F
c. l
d. Cl
58. The least stable hybride is formed by:
a. TI. pb & Bi
b. Au,Ag & Sb
c. Cu,Fe,Ni
d. Ag. Cu. Au
59. Which one the following is not ionic hydride?
a. LiH
b. NaH
c. CsH
d. HCL
60. Which of the following metals does not form an ionic hydride?
a. ca
b. Ba
c. Sr
d. Mg
61. Which is not an intermediate hybrid:
a. CdH2
b. ZnH2
c. SiH2
d. LnH2
62. Which of the following oxides is ampoteric in character.
a. CO2
b. CaO
c. BeO
d. SiO2
63. The binary compound of oxygen with other elements are called:
a. Carbides
b. Halides
c. Hydrides
d. Oxides
64. Which of the following is a covalent oxide?
a. SrO
b. BeO
c. CaO
d. MgO
65. Which oxide is amphoteric in nature?
a. MgO
b. Al2O3
c. SO3
d. CI2O7
66. The energy released or absorbed, when an electron is added to a gaseous atom from a negative ion is called:
a. Ionization potential
b. Electropositivity
c. electron affinity
d. electronegativity
67. Moving from top to bottom in the periodic table, electron affinity:
a. Remains the same
b. Increases
c. No trend
d. Decreases
68. Moving from left to right in the periodic table, electron affnity.
a. Remains the same
b. Increases
c. No trend
d. Decreases
69. In the periodic table, in a group atomic volume gradually:
a. Remains the same
b. Increases
c. Decreases
d. None of these
70. Which of the following has the smallest atomic size?
a. Fluorine
b. Lithium
c. Potassium
d. Carbon
71. What is the symbol of the element with only three electrons & three protons?
a. B
b. Li
c. C
d. Be
72. Moving from top to bottom in a periodic table, the I.E of the elements:
a. Remains the same
b. Increases
c. No trend
d. Decreases
73. The element of which subgroup -A has lowest ionization energy value?
a. I-A
b. VI-A
c. III-A
d. IV-A
74. The elements of which subgroup -A has highest ionization energy value?
a. IV-A
b. III-A
c. VII-A
d. IIII-A
75. Which has highest m.p and b.p?
a. Carbon
b. Li
c. Be
d. B