Atomic Structure NEET PDF

TIME 1:0 Hr ATOMIC STRUCTURE MM-180 57. Isoelectronic species are...

TIME 1:0 Hr ATOMIC STRUCTURE MM-180 57. Isoelectronic species are  SECTION-A 2 (a) CO, CN , NO , C – + 2– (b) CO , CN, NO, C – Attempt All 35 Questions (c) CO+, CN+, NO–, C2 (d) CO, CN, NO, C2 51. The maximum number of electrons in a subshell 58 Which of the following series of transitions in the for which l=3 is spec- trum of hydrogen atom falls in visible region? (1) 14 (2) 10 (a) Brackett series (b) Lyman series (3) 8 (4) 4 (c) Balmer series (d) Paschen series 52. For a given principal energy level n=4,the energy of its sub-shells is of the order 59. Calculate the energy in joule corresponding to (1) s < d < f < p light of wavelength 45 nm. (2) s < p < d < f (Planck’s constant, h = 6.63 × 10–34 J s, speed of light, c = 3 × 108 m s–1) (3) d < f < p < s (a) 6.67 × 1015 (b) 6.67 × 1011 (4) s < p < f < d (c) 4.42 × 10–15 (d) 4.42 × 10–18 53. Which of the following sets of quantum numbers 60. The value of Planck’s constant is 6.63 × 10–34 Js. is correct for an electronin 4f-orbital : 1 The speed of light is 3 × 1017 nm s–1. Which value (1) n=3, l=2, m=–2, s=+ 2 is closest to the wavelength in nanometer of a quantum of light with fre- quency of 6 × 1015s–1? 1 (2) n=4, l=4, m=–4, s=– (a) 50 (b) 75 2 (c) 10 (d) 25 1 (3) n=4, l=3, m=+1, s=+ 61. Orbital having 3 angular nodes and 3 total 2 nodes is 1 (a) 5p (b) 3d (4) n=4, l=3, m=+4, s=+ 2 (c) 4f (d) 6d 54. In uncertainty in position and momentum are 62. Uncertainty in position of an electron (Mass = 9.1 × equal, then uncertainty in velocity is : 10–28g) moving with a velocity of 3 × 104 cm/s accurate 1 h h (1) (2) upto 0.001% will be 2m  2 (Use h/(4 )in uncertainty expression where h = 1 h h 6.626 × 10–27 erg second ) (3) (4) m   (a) 5.76 cm (b) 7.68 cm 55. If n=6, the correct sequence for filling of electron (c) 1.93 cm (d) 3.84 cm will be : (1) ns (n-2)f (n-1)d np 63. 4d, 5p, 5f and 6p orbitals are arranged in the order of de- creasing energy. The correct option is (2) ns (n-1)d (n-2)f np 2´106 Hz (a) 5f > 6p > 4d > 5p (b) 5f > 6p > 5p > 4d (3) ns (n-2)f np (n-1)d = 3´108 ms -1 (c) 6p > 5f > 5p > 4d (d) 6p > 5f > 4d > 5p (4) ns (n-1)d (n-2)f 6.0´1014 1.5´104 56. The number of protons, neutrons and electrons in 64. Orbital having 3 angular nodes and 3 total 175 nodes1.5´10 is 2 0.66´10-2 71 Lu , respectively, are (a) 71, 104 and 71 (b) 104, 71 and 71 (a) 5p (b) 3d (c) 4f (d) 6d (c) 71, 71 and 104 (d) 175, 105 and 71 NLI / 19 65. Select the incorrect statement : 71. Which electronic configuration violates Hunds as well as Pauli's rule : (1) The size of the orbitals increases with increase in (1) n. (2) The region where probability density function (2) reduces to zero is called node. (3) 4f orbital has l=4 (3) (4) For single electron species, energy of the orbitals depends only on n. (4) 66. Choose the correct statement among the following: 72. Nodal planes for 4d Z 2 orbital is / are : (1) All the d-orbitals have same shape (1) 2 (2) The energy of 4s is less than 3d for H-atom (2) 1 (3) For 3p subshell, n=3, l=1 (3) 3 (4) All are correct (4) 0 67. The orbital angular momentuam for 3p electron 73. Statement I : Angular momentum of an electron is : is quantized. Statement II : In an atom only those orbits are h (1) 2h (2) allowed where angular momentum is a multiple 2 h of. 2 1.5 h 3h (3) (4) (1) Both statements I and II are correct. 2 (2) Both statements I and II are incorrect. nh 68. In Bohrs orbit indicates : : (3) Statement I is correct, statement II is incorrect. 2 (4) Statement I is incorrect, statement II is correct. (1) momentum 74. How many electrons in an atom may have the (2) kinetic energy following quantum numbers (3) potential energy i. n=4, s = –1/2, ii. n=3, l=0 (4) angular momentum (1) 32, 2.69 The radial nodes in 3s and 5p orbitals are respectively : (2) 16, 9 (1) 2, 2 (3) 32, 9 (2) 3, 2 (4) 16, 2 (3) 3, 3 75. Arrange the electrons represented by the (4) 2, 3 following sets of quantum numbers in the decreasing order of energy: 70. How many maximum electrons can be associated with following quantum numbers : i. n=4, l=2, m=–1, s=+1/2 n = 4, l = 2, m = –1 ii. n=4, l=0, m=0, s=+1/2 (1) 10 iii. n=3, l=2, m=+1, s=+1/2 (2) 5 iv n=3, l=1, m=0, s=+1/2 (3) 1 (1) 4d > 3d > 4s > 3p (4) 2 (2) 3p > 4s > 3d > 4d (3) 4s > 4d > 3p > 3d (4) 3p > 3d > 4s > 4d  82. Third excitation energy of Li+2 ion is: +3 76. The no.of unpaired electrons in Cr ion will be (1) 108.81 eV (At. no. of Cr = 24) : (1) 2 (2) 114.75 eV (2) 3 (3) 51 eV (3) 4 (4) 48.36 eV (4) 5 83. Match the column I and Column II 77. An object absorbs a photon of wavelength 2400 Å Column-I Column-II and emits two photons. If wavelength of first (A) Total values of m (P) 0, 1, 2....(n – 1) photon is 6000 Å, the wavelength of second photon in a shell will be : (B) Values of l in a shell (Q) 2l + 1 (1) 3600 Å (2) 4000 Å (C) Values of m in a (R) +l.....+2, +1, (3) 5500 Å subshell 0, –1....–l (4) 8400 Å (D) Total values of m (S) n2 78. Which of the following is incorrect about de Broglie in a subshell relationship : The correct relationship is h (1) A-S, B-P, C-Q, D-R (2) A-R, B-P, C-Q, D-S (1) h =  × p (2) v (3) A-S, B-P, C-R, D-Q (4) None of these 84. According to the Bohr theory, which of the (3) Ekinetic (4) Ekinetic following transitions in the hydrogen atom will give rise to the least energetic photon : 79. The anion X–3 has 16 neutrons in its nucleus, If this anion contains 18 electrons, then what will be the (1) n=6 to n=1 number of nucleons in its molecule X4? (2) n=5 to n=4 (1) 64 (3) n=6 to n=5 (2) 93 (4) n=5 to n=3 (3) 124 85. The difference of nth and (n+1)th Bohr’s radius of (4) 60 hydrogen atom is equal to its (n–1)th Bohr’s radius. +3 80. The radius of third shell of Be ion R, then radius The value of n is: of its 6th shell will be: (1) 1 (1) 2R R (2) (2) 2 2 (3) 3 R (4) 4 SECTION-B (4) (3) 4R 4 This section will have 15 questions. Candidate can 81. 450 waves of an energy radiation passes in one choose to attempt any 10 questions out of these 15 minute from a point, then what will be the questions. In case if candidate attempts more than 10 questions, first 10 attempted questions will be wavelength of radiation: considered for marking. (1) 6.66 × 10 5m (2) 4.10 × 10 7m (3) 2.25 × 10 9m (4) 2.25 × 10 -8m NLI / 21 86. Which of the following orbit has the same radius (3) +3 as that of second Bohr's orbit radius of Be ion : (1) H+ (n=1) (4) (2) Li+2 (n=2) (3) He+ (n=2) 92. 3d-orbitals having electron density in all the three (4) H (n=1) axes is: 87. How many electrons in an atom may have the (1) 3dxy following quantum numbers (2) 3dz2 i. n=4, s = –1/2, ii. n=3, l=0 (3) 3dyz (1) 32, 2 (4) 3dzx (2) 16, 9 93. The first emission line of hydrogen atomic (3) 32, 9 spectrum in Balmer series will have wave number (4) 16, 2 (R=Rydberg constant) 5R 88. For sodium atom number of electrons with m = 0 (1) cm 36 will be: 3R (2) cm (1) 2 4 7R (2) 7 (3) cm 144 (3) 9 9R (4) cm 400 (4) 8 94. Which of the following sets of quantum numbers 89. The atomic number of the electron having maximum number of unpaired 3p-electrons is: is correct for an electronin 4f-orbital : (1) 15 1 (1) n=3, l=2, m=–2, s=+ 2 (2) 13 1 (3) 12 (2) n=4, l=4, m=–4, s=– 2 (4) 8 1 90. If in Bohr's model for unielectronic atom, the time (3) n=4, l=3, m=+1, s=+ 2 period of revolution is represented as Tn,z, where n represents shell number and z represents atomic 1 (4) n=4, l=3, m=+4, s=+ number, then the value of T1,2: T2,1 will be: 2 (1) 8:1 95. Which of the following set of quantum numbers (2) 1:8 represents the highest energy of an atom : (3) 1:8 1 (1) n=3, l=0, m=0, s=+ 2 (4) 1:32 91. Which is not in accordance to Aufbau principle : 1 (2) n=3, l=1, m=1, s=+ 2 (1) 1 (3) n=3, l=2, m=1, s=+ 2 (2) 1 (4) n=4, l=0, m=0, s=+ NLI / 23 96. An nf-orbital can accomodate upto: (1) 14 electron (2) Six aelectrons (3) Two electrons with parallel spin (4) Two electrons with opposite spin 97. Maximum number of electrons in a subshell of an atom is determined by following : (1) 2n2 (2) 4l + 2 (3) 2l + 2 (4) 4l – 2 98. The number of waves made by a Bohr electron in an orbit of maximum magnetic quantum number +2 (1) 3 (2) 4 (3) 2 (4) 1 99. In which of the following electronic distribution (ground state) only Hund’s rule is violated : (1) (2) (3) (4) 100. Which of the following is not correct for electronic distribution in the ground state : (1) Co = [Ar] (2) Ni = [Ar] (3) Cu = [Ar] (4) Zn = [Ar] NLI / 25