Chemistry Chapter 2 Entry Test MCQs
Spectrum + Hydrogen Spectrum
51. The wavelength of which of the following pair is same
a. X – rays and γ- rays
b. Absorption and emission spectrum of the same element
c. IR and UV light
d. Continuous and line spectrum
52. Transition from n = 4,5, 6,.to n= 3 in hydrogen spectrum gives
a. Paschen series
b. Balmer series
c. Lyman series
d. Pfund series
53. Which is not electromagnetic radiation?
a. Gamma rays
b. X-rays
c. Infra-red rays
d. Cathode rays
54. Which is the correct order of wave number of the following radiations I.R., U.V., radio waves, X-rays and visible light
a. X – rays > U.V. > visible > I.R. > radio waves
b. X-rays > U.V. > I.R.>visible > radio waves
c. X – rays > radio waves > U.V. > I.R. > visible
d. Radio waves > I.R > U.V. > X- rays > visible
Quantum Numbers
55. How many atomic orbitals are present in the fourth energy level of an atom?
a. 16
b. 32
c. 4
d. 8
56. For which one of the following sets of four quantum number an electron will have the highest energy
a. 4 1 0 -1/2
b. 3 2 1 +1/2
c. 5 0 0 -1/2
d. 4 2 -1 +1/2
57. The fourth electron of Be atom will have quantum number as
a. 2, 0, 0, -1/2
b. 1,0,0,1/2
c. 1,1,1, +1/2
d. 2,1,0, +1/2
58. Which shape is associated with orbital designated by n = 2, ℓ= 1
a. Sausage
b. Spherical
c. Complicated
d. Dumb-bell
59. Which of the following set of quantum number value is not possible?
a. n = 3, ℓ =2, m = -3, s = + 1/2
b. n = 4, ℓ =3, m = -2, s = + 1/2
c. n = 5, ℓ =3, m = 0, s = – 1/2
d. n = 4, ℓ =0, m = 0, s = + 1/2
60. For p-sub shell, the value of magnetic quantum number is
a. -2, -1,0, +1, +2
b. 0
c. -3, -2, -1,0, +1, +2, +3
d. -1, 0, +1
61. Each p-orbital and each d-orbital has lobes respectively as:
a. 2, 2
b. 2, 4
c. 1, 1
d. 1, 2
62. An atom has two electrons in K shell, eight electrons in L shell and six electrons in M shell. The number of s-electrons present in that element is
a. 7
b. 6
c. 10
d. 5
63. The quantum number ‘m’ of a free gaseous atom is associated with
a. The spatial orientation of the orbital
b. The effective volume of the orbital
c. The shape of the orbital
d. The energy of the orbital in the absence of a magnetic field
64. When the azimuthal quantum number has the value of 2, the number of orbitals possible are
a. 1
b. 3
c. 5
d. 7
65. Which of the following orbitals can have more than one nodal plane?
a. 2p
b. 1s
c. 3d
d. 2s
66. Correct set of four quantum numbers for the valence (outermost) electron of rubidium (Z = 37) is
a. 5, 1,1, + 1/2
b. 5, 0, 0 , + 1/2
c. 5, 1, 0, + 1/2
d. 6, 0, 0 , + ½
67. If n = 3, ℓ = 0, m = 0 for valence electrons, then atomic number may be:
a. 11, 12
b. 12, 14
c. 13, 14
d. 11, 13
68. Which of the following sets of quantum numbers represents the electron of the lowest energy?
a. n = 2, 1 = 1, m = 0, s = + 1/2
b. n = 2, 1 = 0, m = 0, s = – 1/2
c. n = 4, 1 = 0, m = 0,s= – 1/2
d. n = 4, 1 = 2, m = 0, s = + 1/2
69. The electrons in the K-shell can be distinguished by
a. Azimuthal quantum number
b. Principal quantum number
c. Spin quantum number
d. Magnetic quantum number
70. Which statement is wrong about quantum numbers
a. ‘ l ’ gives the shape of an orbital
b. ‘n’ gives the idea of energy and size of an orbit
c. ‘s’ gives the direction of spin in an orbital
d. ‘m’ gives the energy of an electron in an orbital
71. The number of orbitals in a shell can be calculated by formula
a. 2n2
b. 2 l + 1
c. n2
d. 2(2 l + 1)
72. The term orbital is also called as:
a. Electronic cloud
b. Shell
c. Electronic spin
d. Orbit
73. A p-orbital can accommodate maximum electrons up to:
a. Four electrons with opposite spin
b. Six electrons with opposite spin
c. Two electrons with opposite spin
d. Two electrons with same spin
74. The set of orbitals having n + ℓ= 5 are:
a. 4f, 4p, 4d
b. 3p, 3d, 6s
c. 5s, 4p, 3d
d. 5p, 5d, 5s
75. If the value of principal quantum number is 3, the maximum number of values of magnetic quantum number:
a. 4
b. 1
c. 9
d. 5