Chemistry Chapter 2 Entry Test MCQs
76. If the value of n = 4, the number of possible values of “ℓ”?
a. 3
b. 2
c. 5
d. 4
77. Maximum number of electrons in a subshell can be
a. 2n2
b. 4l + 2
c. 2l + 1
d. 4l – 2
78. 3p orbital has _ radial nodes
a. one
b. Three
c. none
d. two
80. Quantum number values for 2p orbital are:
a. n=1, l=0
b. n=2, l=1
c. n=2, l=0
d. n=1, l=2
81. Which pair of atomic orbitals possess the same number of radial nodes?
a. 3s and 3d
b. 3s and 3p
c. 1s and 3d
d. 4s and 3s
82. The orbital which is farthest to the nucleus is:
a. d
b. f
c. s
d. p
83. Which of the following sets of quantum numbers is not allowed?
a. n = 3, l = 1, m = -1, s = -1/2
b. n = 3, l = 2, m = 0, s = -1/2
c. n = 3, l = 0, m = 0, s = +1/2
d. All are allowed
84. The number of degenerate orbitals in p–subshell is
a. 5
b. 2
c. 7
d. 3
85. The total number of orbitals containing electrons, if atomic number of the element is 19
a. 10
b. 9
c. 16
d. 6
86. Existence of pair of lines in spectrum of sodium is explained by
a. Azimuthal quantum number
b. Principal quantum number
c. Spin quantum number
d. Magnetic quantum number
87. How many electrons can fit into the sub-shell for which n = 3, ℓ = 1?
a. 6
b. 8
c. 32
d. 18
88. Which quantum number is used to represent the subshells?
a. Azimuthal quantum number
b. Principal Quantum number
c. Spin quantum number
d. Magnetic quantum number
89. An orbital which is spherically symmetrical is
a. f-orbital
b. p-orbital
c. s-orbital
d. d-orbital
90. According to quantum mechanics, the size of electronic shell is told by the quantum number
a. Magnetic quantum number
b. Spin quantum number
c. Principal quantum number
d. Azimuthal quantum number
91. How many numbers of clockwise electrons are present in helium?
a. 2
b. 0
c. 4
d. 1
92. Which of the following orbitals can accommodate 2 electrons?
a. Molecular orbital
b. Atomic orbital
c. Hybrid orbital
d. All of these
93. If the value of n = 4 what is probable value of ℓ
a. 0, 1, 2, 3
b. 0,1
c. 0,1,2
d. None of above
94. The number of orbitals in M – shell is
a. 16
b. 1
c. 9
d. 4
95. For an orbital, a node is
a. A surface where lobes of orbitals exist
b. A surface inside which there is a 90% chance of finding the electron.
c. A surface where there is a maximum probability of finding the electron.
d. These are regions in which there is a 0 probability density of finding electrons
96. The highest energy electron of an element in the ground state is characterized by the following quantum numbers n = 4, l = 0 , m = 0 , s = + ½.The atomic number of element is
a. 20
b. 32
c. 12
d. 19
97. If an atom has four unpaired electrons. What is likely to be the total spin of the electron?
a. 2
b. 1
c. 4
d. 2.5
98. No. of subshells in a shell is estimated from
a. n
b. 2 l + 1
c. n2
d. 2(2 l + 1)
99. The orbitals 3p and 3d have similar property:
a. Angular Nodes
b. Total nodes
c. Total nodes
d. Energy
100. Which of the following pairings is incorrect?
a. 1s orbital; one radial node
b. 2p orbital; no radial nodes
c. 3s orbital; two radial nodes
d. 3d orbital; no radial nodes