12th class (Fsc) Chemistry unit 1 MCQs
76. Keeping in view the size of atoms, which order is the correct one:
a. Lu>Ce
b. Mg>Sr
c. Cl>l
d. Ba>Mg
77. Mark the correct statement:
a. Cl is smaller than Cl atom
b. Na+ is smaller than Na atom
c. Cl)ion) and Cl (atom) are equal in size
d. Na+ is larger than Na atom
78. Which statement is incorrect:
a. All the metals form positive ions
b. All the metals are good conductor of electricity
c. All the metals from acidic oxides
d. All the metals are good conductor are of heat
79. Which statement is correct;
a. Hydrogen resembles in properties with IIA.IVA and VIA element
b. Hydrogen resembles in properties with IA.IVA and VIIA element
c. Hydrogen resembles in properties with IA.IIIA and VIIA element
d. Hydrogen resembles in properties with IIIA.IVA and VA element
80. Mark the correct statement:
a. The ionization energy of calcium is higher then that of beryllium
b. The ionization energy of calcium is lower then that of barium
c. The ionization energy of calcium os lower then that of strontium
d. The ionization energy of calcium is lower then that of magnesium
81. Mark the correct statement:
a. Electron affinity is a measure of energy required to excite an electron
b. Electron affinity is a measure of energy required to remove the electron
c. Electron affinity is a measure of energy released by removing an electron
d. Electron affinity is a measure of energy released by adding an electron
82. Mark the correct statement:
a. Metallic character remains the same from left to right along a period
b. Metallic character increases down th group
c. Metallic character remains the same down the group
d. Metallic character increases from left to right along a period
83. Mark the correct statement:
a. Melting point of halogens remain the same throughout the group
b. Melting point of halogens decrease mdown the group
c. Melting point of halogens first increase and then decrease drown the group
d. Melting point of halogens increase down the group
84. Mark the correct statement:
a. Ionic character of hydrides increases from left to right in a period
b. Covalent character of metal halides increases from left ot right in a period
c. The basicity of group IIA oxides decrease on descending the group
d. Boiling points of group IVA hydrides deceases down the group
85. In the Mandeleev’s periodic law the properties of elements are periodic function of their:
a. Atomic number
b. Volume
c. Atomic masses
d. Densities
86. Memorable contribution in the classification of elements were made by:
a. Newland
b. Al.Razi
c. Dobereiner
d. All of them
87. Most of the elements are:
a. Metalloids
b. Crystalloids
c. Non-metals
d. Metals
88. The decrease in atomic sizes is not much prominent across rowsm containing elements of:
a. d-block
b. s-block
c. f-block
d. p-block
89. The basis of modern Periodic Law is:
a. Ionization energy
b. Electron affinity
c. Atomic number
d. Atomic mass
90. In modern periodic table, the elements are arranged in them asscending order of:
a. Valence electrons
b. Atomic masses
c. Atomic number
d. Valency
91. Elements of the periodic table are calssified into blocks:
a. Five
b. Four
c. Six
d. Three
92. How many electrons are present in 5th period of the peroidic table:
a. 18
b. 32
c. 28
d. 8
93. 6th period contains the number of elements:
a. 10
b. 18
c. 8
d. 32
94. Which is longest period of periodic table?
a. 6
b. 4
c. 7
d. 5
95. The work alkali is derived from which language?
a. French
b. Arabic
c. German
d. Greek
96. The elements of group II-A are called:
a. Coinage metals
b. Alkali metals
c. Metalloids
d. Alkaline earth metals
97. Mark the correct statement:
a. Metals are non-conductorm of electricity
b. Metals form basic oxides
c. Metals have tendency to accept electron
d. Metals forms acidic oxides
98. Which one is an incomplete period?
a. 6th
b. 4th
c. 7th
d. 5th
99. In periodic table all the non-metals are placed under which of:
a. p
b. f
c. s
d. d
100. The number of groups present in modern periodic table are:
a. 6
b. 8
c. 5
d. 7