ATOMIC STRUCTURE
ONE WORD
1. Who discovered cathode rays?
a) Ruther ford b) Goldstein c) Dalton d) Thomson
2. ……….. was discovered by Anderson.
a) nucleus b) electron c) neutron d) positron
3. Dual character of electrons was explained by ………
a)Bhor b) Heisenberg c) de broglie d) pauli
4. de Broglie equation is ............
a) hv=mc2 b) (hc/lambda)=mc2 c) lambda=h/mc
d) all of these
5. The circumference of the circular orbit of an electron must be an
integral multiple of the ……….wave.
a) wavelength, IR b) wavelength, UV
c) wavelength, de Broglie d) wavenumber, Newton.
6. The size of the s orbital depends upon the value of ………
quantum number.
a) spin b) principal c) azimuthal d)spin
7. The mass of electron is …… Kg.
a) 9.1 *10 (-31) b) 9.1 *10(-340 c) 9.1 *10(-33)
d) 9.1 * 10(-13).
8. Antineutrino was discovered by………..
a) Planck b) Fermi c)de Broglie d)Bhor
9. A de Broglie wavelength of 1 angstrom will be obtained if the
applied voltage is approximately………..
a) 150v b) 1.5v c) 15v d) 15mv
10. Atomic number was proposed by……..
a) Planck b) Maxwell c) Mosley d) Mendelef
11. Who discovered meson?
a) Yuwakawa b) Yukawa c) Young d) Euler
12. The antiproton was discovered by ……..
a) Chadwick b)Fermi c) Segre d) Goldstein
13. Cork and his group discovered ……
a) antiproton b) antineutron c) antielectron d) antineutrino
14. Davisson and Germer performed the ……… experiment.
a) electron acceleration b) proton acceleration
c) electron diffraction
d) proton diffraction
15. The e/m ratio of the electron was determined by……..
a) Milliken b) Mulliken c) Bhor d) Thomson
16. The black body radiation is due to ……..nature of the electron.
a) particle b) wave c) both a and b d) neither a nor b
17.The photoelectric effect is due to……….. nature of electron
a) particle b) wave c) both a and b d) neither a nor b
18. The Davisson and germer experiment confirms the
……….nature of electron.
a) particle b) wave c) both a and b d) neither a nor b
19.Diffraction and interference are characteristic of…………..
a) particle b) wave c) both a and b d) neither a nor b
20. The electromagnetic theory was proposed by……..
a) Bhor b) Maxwell c) Plucker d) Milliken
21. Elliptical orbits are introduced by ……….
a) Sony b) Sommerfield c) Plucker d) Milliken
22. Energy of the single electron in hydrogen if it were in the
second orbit is …………..Kj per mole.
a) -1312 b) -328 c) -656 d) 0
23.The ionization energy of hydrogen I the ground state is -1312kj
per mole. If its energy in the second orbit is -329kj per mole , the
energy that would be released from the second orbit would be
……. Kj per mole.
a) -1312 b) -328 c) -656 d) 984
24.The ionization energy of hydrogen in the ground state is
………..
a) -1312 b) -328 c) -656 d) 0
25. de Broglie waves have found application in ………
microscopy
a) optical b) electron c) neutron d) positron
26. …….. proposed the uncertainity principle
a) Hund b) Heisenberg c) Pauli d) Mosley
27. The circular orbit of the electron should be a integral multiple
of the wavelength of ………….. wave
a) de Broglie b) electric c) light d) sound
28. P=h/lambda is known as ……… equation .
a) de Broglie b) Einstein c) Einstein- de Broglie
d) Einstein-Mulliken
29. The energy of a electron at infinity is assumed to be ………..
a) infinity b) positive integer c) zero d) negative
30. When an electron is at infinite distance from the nucleus, it is
said to be at ………. Energy.
a) zero b) infinite c) positive d) negative
31. The energy required to shift an electron from the first orbit to
an infinite orbit is known as ……….. energy.
a) excitation b) transition c) ionization d) polarization
32. Ethylene is an example for a ………. Shape molecule.
a) linear b) octahedral c) triangular planar d) tetrahedral
33. The distribution of electrons among various molecular orbitals
is called ……… configuration.
a) atomic b) electronic c) MO d) orbital
34. The stability of a molecular or an ion can be determined from
……. Order.
a) order b) molecular c) ionic d) bond
35. Half of the difference between the number of electrons in the
bonding and antibonding orbitals is ………. Order.
a) band b) broad c) bond d) beam
36. The filling up of atomic orbitals in the increasing order of
energy levels is that of ………
a) Aufbau b) Hund c) Pauli d) Bhor
37. ………… is the space around the nucleus having the maximum
probability of finding an electron
a) Orbit b) orbital c) shell d) Niche
38. Given that the kinetic energy is the same, which of the
following will have the maximum de Broglie wavelength?
a) Alpha particle b) proton c) beta particle d) neutron
39. The value of Bhor’s radius for hydrogen is ……….. cm.
a) 0.52* 10(-8) b) 0.52*10(-10) c) 0.52*10(-6)
d) 0.52 * 10(-12)
40. The energy of the single electron in the grond state of hydrogen
atom is …………. J.
a) 1.938*10(-15) b) 1.938 *10(-16) c) 1.938 *10(-17)
d) 1.938*10(-18)
41. The hybridization of sf6 molecule is ……..
a) sp3d3 b) sp3 c) sp3d2 d) sp2d
42. The hybridization in [ PtCl4]2- molecule is ……..
a) sp2d b) sp3 c) sp3d2 d) sp3d
43. The hybridization in PF5 molecule is ………
a) sp3d3 b) sp3 c) sp3d2 c) sp3d
44. the hybridization in IF7 molecule is ………
a) sp3d3 b) sp3 c) sp3d2 d) sp3d
45. The hybridization in NO2- ion is ………
a) sp3d b) sp3 c) sp3d2 d) sp2
46. The hybridization in NO3- ion is …….
a) sp3d2 b) sp2 c) sp2d3 sp3d
47. The hybridization in SO4- ion is …………
a) sp3 b) sp2 c) sp3d2 d) sp3d
48. The hybridization in CO3- ion is ……….
a) sp3d3 b) sp3 c) sp2 d) sp3d
49. The hybridization in NH4- ion is ……………
a) sp3d3 b) sp3d c) sp2 d) sp3
50. The hybridization in ClO4- ion is ………..
a) sp3d3 b) sp3d c) sp2 d)sp3
51. The hybridization in BH3 molecule is ………
a) sp3d3 b) sp3 c) sp2 d) sp2
52. The hybridization in BeF2 molecule is ………….
a) sp3d3 b) sp3 c) sp2 d) sp
53. The hybridization in acetylene molecule is ………….
a) sp3d3 b) sp3 c) sp2 d) sp3d
54. The hybridization in ClO2- ion is ………
a) sp3d3 b) sp3 c) sp2 d) sp3d
55. The hybridization in Clo3- ion is ……….
a) sp3d3 b) sp3 c) sp2 d) sp2d
56. The hybridization in Co2 molecule is …….
a) sp3d3 b) sp3 c) sp d) sp3d
57.The hybridization in BrF5 molecule is ………
a) sp3d3 b) sp3 c0 sp3d2 d) sp3d
58. The hybridization in XeOF4 molecule is …..
a) sp3d2 b) sp3 c) sp d) sp3d
59. The hybridization in carbon tetrachloride molecule is ……….
a) sp3d3 b) sp c) sp3 d) sp3d
60.The hybridization in hydronium ion (H3O)+ is ………
a) sp3d3 b) sp3 c) sp d) sp3d
61. The hybridization in nitrogen triflouride molecule is ………
a) sp3d3 b) sp c) sp3 d) sp3d
62. The hybridization in CIF3 molecule is ………..
a) sp3d3 b) sp3 c) sp d) sp3d
63. The hybridization in water molecule is ……….
a) sp3d3 b) sp3d3 c) sp3 d) sp3d
64. The hybridization in mercuric chloride molecule is ………
a) sp3d3 b) sp3 c) sp d) sp3d
65. The hybridization in ethylene molecule is ……….
a) sp3d3 b) sp3 c) sp2 d) sp3d
66. The hybridization in BeH2 molecule is ………..
a) sp3d3 b) sp3 c) sp d) sp3d
67.The head-on overlap of atomic orbital results in ……… bond.
a) alpha b) beta c) sigma d) pi
68. If all the electrons in a molecule are paired then the molecule
is………
a) paramagnetic b) diamagnetic
c) sometimes paramagnetic and mostly diamagnetic
d) sometimes diamagnetic and mostly paramagnetic
69. If all the electrons in a molecule is unpaired then the molecule
is ……………..
a) paramagnetic b) diamagnetic
c) sometimes paramagnetic and mostly diamagnetic
d) sometimes diamagnetic and mostly paramagnetic
70. Hund and Mulliken proposed the ……….. theory.
a) magnetic spin b) electronic spin c) coordination d)
molecular orbital
71. The number of molecular orbitals formed is ……… the
number of atomic orbitals.
a) not related to b) equal to c) more than d) lesser than
72. The molecular orbital having lower energy is known as …….
a) bonding b) antibonding c) probonding d) parabonding
73. The molecular having higher energy is known as ……….
a) antibonding b) bonding c) probonding d) prebonding
74. The bonding molecular orbitals are not represented by………..
a) alpha b)beta c) sigma d) pi
75. The antibonding molecular orbitals are not represented by…….
a) alpha* b) beta* c) sigma* d) pi*
76. The shapes of molecular orbitals depend upon ……… of
combining atomic orbitals.
a) density b) volume c) shape d) size
77. In caseof heteronuclear molecules, atomic orbitals of …….
energy combine to form the molecular orbitals.
a) different b) near-equal c) zero d) infinite.
78. In the case of homonuclear molecules, the orbitals involved in
hybridization must have……. Energy.
a) different b) equal c) zero d) infinite.
79. The lateral overlap of atomic orbital results in …… bond.
a) alpha b) beta c) sigma d) pi.
80. Bond length is ........ related to bond order.
a) directly b) inversely
c) not d) sometimes directly and sometimes indirectly.
81. Bond order is given by the expression ……
a) (Nb-Na)/2 b) (Nb-Na)/3 c) (Nb-Na) d) 2(Nb-Na).
82. Bond order can be ........
a) 100 b) a fraction c) infinity d) zero.
83. The bond order in nitrogen molecule is …… the bond order in
oxygen molecule.
a) longer than b) same as c) shorter than d) much longer
than.
84. For s orbitals, when l=0 the value of m is ….
a) 0 b) 1 c) 10 d) 100.
85. An important feature of the 2s orbital is, it has a node where
the possibility of finding the electron is …..
a) minimum b) maximum c) infinite d) zero.
86. Orbitals having same energy are known as …… set of orbitals.
a) degenerate b) nondegenerate c) generate d) nongenerate.
87. There are ….. lobes in any d orbital .
a) 1 b) 3 c) 4 d) 2.
88. In the filling up of molecular orbitals, ……. Will not take place
until the degenerate orbitals have one electron each.
a) unpairing b) pairing c) sharing d) unsharing.
89. Molecular orbitals are filled in the ….. order of their …..
a) decreasing, energy b) increasing, energy
c) decreasing, volume d) increasing, energy.
90. According to Pauli’s exclusion principle, the two electrons
occupying a molecular orbital should have ….. spin
a) same b) no
c) opposite d) sometimes same sometimes opposite.
91. The two hydrogen atoms in a hydrogen molecule are connected
by….. bond(s).
a) a single sigma b) a single pi
c) single sigma and single pi d) two pi.
92. Since no unpaired electrons are present, the hydrogen molecule
is……
a) paramagnetic b) diamagnetic
c) sometimes paramagnetic mostly diamagnetic
d) sometimes diamagnetic mostly paramagnetic.
93. The bond order of He2 comes out to be zero. Therefore He2
molecule …… exixts.
a) can exist b) can’t exist c) can exist at times d) none
94. The hydrogen bridge network in water is responsible for its ….
Nature.
a) boiling b) liquid c) tasteless d) colourless.
95. In Which of the following molecules is hydrogen bonding
absent?
a) water b) hydrogen fluoride
c) carbon tetrachloride d) ethyl alcohol
96. Intramolecular hydrogen bonding is not characteristic of ….
a) o-nitrophenol b) salicylic acid c) salicylaldehyde
d) carbolic acid.
97. The stability of a molecule is directly proportional to …
a) bond length b) bond order c) color d) density.
98. If Nb >Na the molecule is …..
a) moderately stable b) stable
c) unstable d)very unstable.
99. If Na>Nb the molecule is ….
a) moderately stable b) stable
c) unstable d) very stable.
100. If Na=Nb the molecule is ….
a) moderately stable b) stable
c) unstable d) very stable.