Unit # 5…….. M.C.Qs on Atomic Structure
1. A
compound material which emits faint visible light by absorbing radiant energy
is called:
|
(a)
|
Fluorescent
|
(b)
|
Cathode
|
|
(c)
|
Anode
|
(d)
|
None
of the above
|
2. Cathode
rays experiment shows the presence of:
|
(a)
|
Electrons
|
(b)
|
Protons
|
|
(c)
|
Neutrons
|
(d)
|
Nucleus
|
3. The
e/m ratio of cathode rays (electrons) is:
|
(a)
|
1.7588x1011C/kg
|
(b)
|
1.7588x108 C/g
|
|
(c)
|
all of the above
|
(d)
|
None of the above
|
4. The
charge on an electron is:
|
(a)
|
1.6022x10-19 C
|
(b)
|
1.6022x10-18 C
|
|
(c)
|
1.6022x10-29 C
|
(d)
|
1.6022x10-21 C
|
5. The
mass of an electron is:
|
(a)
|
9.1096x10-19 kg
|
(b)
|
9.1096x10-31 kg
|
|
(c)
|
9.1096x10-20 kg
|
(d)
|
9.1096x10-30 kg
|
6. Which
particle has a mass of 1/1836 times that of hydrogen?
|
(a)
|
Electrons
|
(b)
|
Protons
|
|
(c)
|
Neutrons
|
(d)
|
Positron
|
7. Which
particle has a mass of 1836 times that of electron?
|
(a)
|
β-particles
|
(b)
|
Protons
|
|
(c)
|
Neutrons
|
(d)
|
Positron
|
8. The
e/m ratio for positive (anode) rays is ……………..of nature of gas used
|
(a)
|
Dependent
|
(b)
|
Independent
|
|
(c)
|
none
of the above
|
(d)
|
all
of the above
|
9. Which
gas has a highest value of e/m ratio?
|
(a)
|
Hydrogen
|
(b)
|
helium
|
|
(c)
|
nitrogen
|
(d)
|
oxygen
|
10. The
e/m ratio of cathode rays is always ……….. anode rays.
|
(a)
|
less
than
|
(b)
|
greater
than
|
|
(c)
|
Equal
to
|
(d)
|
none
of the above
|
11. The
spontaneous emission of nuclear radiations from radioactive elements is called
|
(a)
|
Radioactivity
|
(b)
|
Fission
|
|
(c)
|
Cleavage
|
(d)
|
Ionization
|
12. These
are helium nuclei with double positive charge and atomic mass of 4 amu
|
(a)
|
alpha
rays
|
(b)
|
B-rays
|
|
(c)
|
Gamma
rays
|
(d)
|
X-rays
|
13. Alpha
rays consist of:
|
(a)
|
Stream
of hydrogen
|
(b)
|
Stream
of Helium
|
|
(c)
|
stream
of electron only
|
(d)
|
Stream
of neutron only
|
14. The
fast moving electrons like the cathode rays are called
|
(a)
|
alpha
rays
|
(b)
|
beta-rays
|
|
(c)
|
gamma
rays
|
(d)
|
X-rays
|
15. Which
rays are electromagnetic radiations traveling with velocity of light?
|
(a)
|
alpha
rays
|
(b)
|
beta-rays
|
|
(c)
|
gamma
rays
|
(d)
|
X-rays
|
16. The
wavelength of gamma rays is …………than most of the X-rays:
|
(a)
|
Shorter
|
(b)
|
Larger
|
|
(c)
|
Equal
|
(d)
|
all
of the above
|
17. Which
radioactive rays have greater penetrating power?
|
(a)
|
alpha
rays
|
(b)
|
beta-rays
|
|
(c)
|
gamma
rays
|
(d)
|
none
of the above
|
18. Gamma
rays are emitted as
|
(a)
|
Protons
|
(b)
|
Electrons
|
|
(c)
|
Neutrons
|
(d)
|
Photons
|
19. The phenomenon of emission of radioactive
radiations from nuclei of lighter isotopes of a stable element due to
bombardment of fast moving sub atomic particles is called
|
(a)
|
Radioactivity
|
(b)
|
natural radioactivity
|
|
(c)
|
artificial
radioactivity
|
(d)
|
Cleavage
|
19. Which
order is correct?
|
(a)
|
electron<proton<neutron
|
(b)
|
proton<electron<neutron
|
|
(c)
|
neutron<electron<proton
|
(b)
|
proton<neutron<electron
|
20. Alpha
particle consists of:
|
(a)
|
2
protons and one neutrons
|
(b)
|
2
electrons and 2 neutrons
|
|
(c)
|
2
protons and 2 neutrons
|
(b)
|
2
protons and 3 neutrons
|
21. The
e/m ratio of positive rays is always:
|
(a)
|
Much
smaller than cathode rays.
|
(b)
|
Much
greater than cathode rays.
|
|
(c)
|
equal
to cathode rays
|
(b)
|
Unpredictable
|
22. Photons
of red color are:
|
(a)
|
More
energetic than that of violet colour
|
(b)
|
less
energetic than that of violet color
|
|
(c)
|
equal energetic than that of
violet colour
|
(b)
|
none
of the above
|
23. The
frequency of X-rays is:
|
(a)
|
very small
|
(b)
|
very high
|
|
(c)
|
intermediate
|
(d)
|
all of the above
|
24. Moseley
showed that frequency of X-rays is directly proportional to:
|
(a)
|
atomic number
|
(b)
|
mass number
|
|
(c)
|
Number of neutrons
|
(d)
|
none of the above
|
25. Moseley found that the wavelength of X-rays
emitted ……. regularly with increasing atomic no:
|
(a)
|
increase
|
(b)
|
Decrease
|
|
(c)
|
both a and b
|
(d)
|
none of the above
|
26. The
energy of photon is directly proportional to
|
(a)
|
frequency of light
|
(b)
|
Wavelength
|
|
(c)
|
all of the above
|
(d)
|
none
of the above
|
27. The
energy of photon is inversely proportional to
|
(a)
|
frequency of light
|
(b)
|
wavelength
|
|
(c)
|
speed of light
|
(d)
|
none
of the above
|
28. The
spectrum of sun or of incandescent solids (electric light) is:
|
(a)
|
line spectrum
|
(b)
|
continuous spectrum
|
|
(c)
|
both a and b
|
(d)
|
none of the above
|
29. Light
of a single wavelength is called
|
(a)
|
Monochromatic
|
(b)
|
Dichromatic
|
|
(c)
|
Polychromatic
|
(d)
|
All of above
|
30. It
is called fingerprint of element
|
(a)
|
line spectrum
|
(b)
|
continuous spectrum
|
|
(c)
|
absorption spectrum
|
(d)
|
all of the above
|
31. Violet
colour has a wavelength of
|
(a)
|
4000-4200 A°
|
(b)
|
4200-4600 A°
|
|
(c)
|
4600-5000 A°
|
(d)
|
none of above
|
32. Indigo
color has a wavelength of
|
(a)
|
6300-7500 A°
|
(b)
|
4600-5100A°
|
|
(c)
|
4200-4600 A°
|
(d)
|
5100-5800 A°
|
33. Blue
color has a wavelength of:
|
(a)
|
6300-7500 A°
|
(b)
|
6000-6300 A°
|
|
(c)
|
5800-6000 A°
|
(d)
|
4600-5100 A°
|
34. Green
color has a wavelength of
|
(a)
|
4000-4200 A°
|
(b)
|
4200-4600 A°
|
|
(c)
|
4600-5100 A°
|
(d)
|
5100-5800 A°
|
35. Yellow
color has a wavelength of
|
(a)
|
5800-6000 A°
|
(b)
|
4000-4200 A°
|
|
(c)
|
4200-4600 A°
|
(d)
|
4600-5100 A°
|
36. The
color with wave length 600-630 nm (6000-6300A0) is:
|
(a)
|
Red
|
(b)
|
Green
|
|
(c)
|
Yellow
|
(d)
|
Orange
|
37. 1A
is equal to:
|
(a)
|
10-10 m
|
(b)
|
10-8cm
|
|
(c)
|
10-1nm or 102
pm
|
(d)
|
All of the above
|
38. 10A°
is equal to:
|
(a)
|
10-9m
|
(b)
|
10-7cm
|
|
(c)
|
1nm
|
(d)
|
All of the above
|
39. The
value of plank’s constant is:
|
(a)
|
6.625x10-34 J-S
|
(b)
|
6.625x10-32 J-S
|
|
(c)
|
6.625x10-36 J-S
|
(d)
|
6.625x10-28 J-S
|
40. It
is a distance between two successive crest or trough:
|
(a)
|
Frequency
|
(b)
|
Wavelength
|
|
(c)
|
Amplitude
|
(d)
|
Wave number
|
41. The
no of waves per unit distance is called:
|
(a)
|
Wave frequency
|
(b)
|
Wavelength
|
|
(c)
|
Amplitude
|
(d)
|
wave number
|
42. The
inverse of wavelength is called:
|
(a)
|
Wave frequency
|
(b)
|
Time period
|
|
(c)
|
Amplitude
|
(d)
|
Wave number
|
43. Rutherford’s
alpha particle scattering experiment showed for the first time that the atom has:
|
(a)
|
Electrons
|
(b)
|
Protons
|
|
(c)
|
Neutrons
|
(d)
|
A nucleus
|
44. An instrument that measures the intensity and
frequency of emitted or absorbed photon radiation is called:
|
(a)
|
Spectrometer
|
(b)
|
Hydrometer
|
|
(c)
|
Barometer
|
(d)
|
Calorimeter
|
45. The
numerical value of Bohr’s radius
|
(a)
|
5.29x10-11m
|
(b)
|
5.29x10-9 cm
|
|
(c)
|
0.529A°
|
(d)
|
All of the above
|
46. Bohr’s
theory does not explain the spectra of:
|
(a)
|
Hydrogen
|
(b)
|
single electron system
|
|
(c)
|
multi electron system
|
(d)
|
none of the above
|
47. Lyman
series lies in:
|
(a)
|
Visible region (l
= 4000-8000A°).
|
(b)
|
Ultraviolet region (l
= 2000-5000A°).
|
|
(c)
|
Infra red region (l
= 9000-10000A°).
|
(d)
|
Far-infra red region (l >10000A°).
|
48. Balmer
series lies in
|
(a)
|
visible region
|
(b)
|
ultra violet region
|
|
(c)
|
infra red region
|
(d)
|
none of the above
|
49. Paschen
series lies in
|
(a)
|
visible region
|
(b)
|
ultra violet region
|
|
(c)
|
infra red region
|
(d)
|
none of the above
|
50. Lyman
series is formed when electrons jump from any higher orbit to ……. orbit
|
(a)
|
1
|
(b)
|
2
|
|
(c)
|
3
|
(d)
|
4
|
51. Balmer
series is formed when electrons jump from any higher orbit to ____orbit
|
(a)
|
1
|
(b)
|
2
|
|
(c)
|
3
|
(d)
|
4
|
52. paschen series is formed when electrons
jump from any higher orbit to………..orbit.
|
(a)
|
1
|
(b)
|
2
|
|
(c)
|
3
|
(d)
|
4
|
53. Bracket
series is formed when electron jumps from any higher orbit to……….orbit
|
(a)
|
1
|
(b)
|
2
|
|
(c)
|
3
|
(d)
|
4
|
54. pfund series is formed when electron
jumps from any higher orbit to _____ orbit
|
(a)
|
1
|
(b)
|
5
|
|
(c)
|
3
|
(d)
|
4
|
55. This
quantum number tells the size of orbit and energy of electron:
|
(a)
|
n
|
(b)
|
l
|
|
(c)
|
m
|
(d)
|
ms
|
56. This
quantum number shows the shape of an orbital
|
(a)
|
n
|
(b)
|
l
|
|
(c)
|
m
|
(d)
|
ms
|
57. This
quantum number shows the orientation of an orbit
|
(a)
|
n
|
(b)
|
l
|
|
(c)
|
m
|
(d)
|
ms
|
58. This
quantum number specifies the spin of electron in an orbit
|
(a)
|
n
|
(b)
|
l
|
|
(c)
|
m
|
(d)
|
ms
|
59. Principle
quantum number (n) specifies:
|
(a)
|
size of orbit
|
(b)
|
energy of electron
|
|
(c)
|
maximum shell capacity
|
(d)
|
all of the above
|
60. For
energy level n=3 the no of possible sub-shells are
|
(a)
|
1
|
(b)
|
3
|
|
(c)
|
4
|
(d)
|
9
|
61. If
the value of l=0 the orbital is spherical in shape and is called
|
(a)
|
s
|
(b)
|
p
|
|
(c)
|
d
|
(d)
|
f
|
62. If
the value of l=1 the orbital is dumbbell in shape and is called
|
(a)
|
s
|
(b)
|
p
|
|
(c)
|
d
|
(d)
|
f
|
63. If
the value of l=2 the orbital is called
|
(a)
|
s
|
(b)
|
p
|
|
(c)
|
d
|
(d)
|
f
|
64. No
two electrons in an atom has same set of quantum no. this is called
|
(a)
|
Auf-Bau principle
|
(b)
|
Pauli’s principle
|
|
(c)
|
Uncertainty principle
|
(d)
|
Hund’s rule
|
65. Which
of the following principle limits the maximum no of electrons in an orbital of
two?
|
(a)
|
Auf-Bau principle
|
(b)
|
Pauli’s principle
|
|
(c)
|
(n + l)rule
|
(d)
|
Hund’s rule
|
66. The
electrons are added in an orbital in the order of increasing orbital energy.
This is called
|
(a)
|
Auf-Bau principle
|
(b)
|
Pauli’s principle
|
|
(c)
|
(n + l)rule
|
(d)
|
Hund’s rule
|
67. In
degenerate orbital, electrons would tend to go in separate orbital with same
spin. This is the statement of:
|
(a)
|
Auf-Bau principle
|
(b)
|
Pauli’s principle
|
|
(c)
|
(n + l)rule
|
(d)
|
Hund’s rule
|
68. Which
rule violated in the configuration N = 1s2, 2s2 2px2
2py1
|
(a)
|
Auf-Bau principle
|
(b)
|
Pauli’s principle
|
|
(c)
|
(n + l)rule
|
(d)
|
Hund’s rule
|
69. When
3d orbital is complete, the newly entering electron goes into
|
(a)
|
4f
|
(b)
|
4p
|
|
(c)
|
4s
|
(d)
|
4d
|
70. The
inter nuclear distances between two carbon atoms in diamond is 1.54A than the radius of carbon atom would be:
|
(a)
|
0.77A°
|
(b)
|
0.077A°
|
|
(c)
|
1.77A°
|
(d)
|
none of the above
|
71. Atomic
radii decrease along a period due to:
|
(a)
|
increase in nuclear charge
|
(b)
|
decrease in force of attraction on valence electron
|
|
(c)
|
decrease in nuclear charge
|
(d)
|
none of the above
|
72. Atomic
radii ……….. in a group from top to bottom:
|
(a)
|
Increase
|
(b)
|
Decrease
|
|
(c)
|
remains same
|
(d)
|
none of the above
|
73. Cations
are………… in size than their parent atom:
|
(a)
|
Smaller
|
(b)
|
Larger
|
|
(c)
|
remains same
|
(d)
|
none of the above
|
74. Which
one is larger in size than its parent atom?
|
(a)
|
Cl+
|
(b)
|
Cl
|
|
(c)
|
Cl–
|
(d)
|
none of the above
|
75. Anions
are………… in size than its parent atom
|
(a)
|
Smaller
|
(b)
|
Larger
|
|
(c)
|
Equal
|
(d)
|
none of the above
|
80. Na+,
Mg2+ and Al3+ are called:
|
(a)
|
Iso-electric ions
|
(b)
|
compound ions
|
|
(c)
|
Anions
|
(d)
|
none of the above
|
81. which one is larger in size?
|
(a)
|
Na+
|
(b)
|
Mg2+
|
|
(c)
|
Al3+
|
(d)
|
all are equal in size
|
82. The
energy required for the removal of least tightly bounded electron from the
valence shell of its isolated atom is called
|
(a)
|
ionization energy
|
(b)
|
ionization potential
|
|
(c)
|
I.P.
|
(d)
|
all of the above
|
83. The
2nd and 3rd I.P. is always ………. than 1st I.P.
|
(a)
|
Smaller
|
(b)
|
greater
|
|
(c)
|
Equal
|
(d)
|
both a and b
|
84. It
is easier to remove electron from which one of the following
|
(a)
|
Na+
|
(b)
|
Mg+
|
|
(c)
|
Al3+
|
(d)
|
Ca+
|
85. It
is difficult to remove electron from which one of the following
|
(a)
|
Ca
|
(b)
|
Mg
|
|
(c)
|
Al2+
|
(d)
|
Na
|
86. Bigger
size atoms possess:
|
(a)
|
high I.P.
|
(b)
|
Low I.P.
|
|
(c)
|
both a and b
|
(d)
|
None of the above
|
87. I.P.
………………. from top to bottom in a group
|
(a)
|
Increase
|
(b)
|
Decrease
|
|
(c)
|
Same
|
(d)
|
none of the above
|
88. I.P.
………… from left to right in a period
|
(a)
|
Increase
|
(b)
|
Decrease
|
|
(c)
|
Same
|
(d)
|
none of the above
|
89. The
I.P. is inversely proportional to
|
(a)
|
Nuclear energy
|
(b)
|
Shielding effect
|
|
(c)
|
Both a and b
|
(d)
|
None of the above
|
90. The
energy released when an electron is added in an lowest energy state of a
neutral isolated gaseous atom to form an anion is
called
|
(a)
|
Electron affinity
|
(b)
|
Ionization potential
|
|
(c)
|
Electronegativity
|
(d)
|
Electropositivity
|
91. The
formation of a bivalent anion from a univalent anion is always …………:
|
(a)
|
Exothermic
|
(b)
|
Endothermic
|
|
(c)
|
both a and b
|
(d)
|
None of the above
|
92. High
values of electron affinity shows that element are
|
(a)
|
oxidizing agent
|
(b)
|
Reducing agent
|
|
(c)
|
electron donor agents
|
(d)
|
None of the above
|
93. The
measure of the ability of an atom to attract an electron pair to itself in a
chemical bond is called
|
(a)
|
Electron affinity
|
(b)
|
Ionization potential
|
|
(c)
|
Electronegativity
|
(d)
|
Electropositivity
|
94. The
average ionization energy and electron affinity is called
|
(a)
|
electron affinity
|
(b)
|
ionization potential
|
|
(c)
|
Electronegativity
|
(d)
|
Electropositivity
|
95. it is the most electronegative element:
|
(a)
|
F
|
(b)
|
O
|
|
(c)
|
Cl
|
(d)
|
N
|
96. Cations
are ________electronegative than their parent atom
|
(a)
|
Less
|
(b)
|
More
|
|
(c)
|
Equal
|
(d)
|
None of the above
|
97. Anions
are …………….electronegative than their parent atom
|
(a)
|
Less
|
(b)
|
More
|
|
(c)
|
Equal
|
(d)
|
None of the above
|
98. Electronegativity
. ……………in a group from top to bottom
|
(a)
|
Increase
|
(b)
|
Decrease
|
|
(c)
|
both a and b
|
(d)
|
none of the above
|
99. Electronegativity
. …………… in a period from left to right
|
(a)
|
Increase
|
(b)
|
Decrease
|
|
(c)
|
both a and b
|
(d)
|
none of the above
|
100. If ΔE.N. between two bounded atoms is greater
than 1.7 then the bond in between them will be
|
(a)
|
Covalent
|
(b)
|
Dative
|
|
(c)
|
Ionic
|
(d)
|
None of the above
|
101. If the ΔE.N. between two bounded atom is less
than 1.7, than the bond in between them will be
|
(a)
|
Covalent
|
(b)
|
Dative
|
|
(c)
|
Ionic
|
(d)
|
None of the above
|
102. Which
one is more polar than other?
|
(a)
|
HF
|
(b)
|
NH3
|
|
(c)
|
H2O
|
(d)
|
CH4
|
103. Which
one is more electronegative than the other?
|
(a)
|
Li+
|
(b)
|
F─
|
|
(c)
|
Cs
|
(d)
|
O2─
|
NOTE: nitrogen has 0 electron affinities
because it has half-filled valence shell which makes it stable thereby reducing the tendency
to accept electron.
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