Atomic Structure PYQs Set 3 (PDF)

Set 3 of 14 · Questions 61-90 of 415

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Atomic Structure · Set 3 (Q61-90)
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61. $Find the number of orbitals and maximum electrons respectively present in M shell?$ (1) $4,8$ (2) $9,18$ (3) $16,32$ (4) $1,2$ 62. $The degeneracy of the level of hydrogen atoms that contain the energy of (\frac{- R _{H}}{16}) is$ (1) $4$ (2) $16$ (3) $9$ (4) $12$ 63. $Assertion (A) : Atoms with completely filled and halffilled subshells are stable.Reason (R): Completely filled and half-filled subshells have symmetrical distribution of electrons and have maximum exchange energy.The correct answer is$ (1) $(A) and (R) are correct, (R) is the correct explanation of (A)$ (2) $(A) and (R) are correct, (R) is not the correct explanation of (A)$ (3) $(A) is correct, but (R) is not correct$ (4) $(A) is not correct, but (R) is correct$ 64. $The wave numbers of three spectral lines of H atom are considered. Identify the set of spectral lines belonging to Balmer series. (R = Rydberg constant)$ (1) $\frac{7 R}{144}, \frac{3 R}{16}, \frac{16 R}{255}$ (2) $\frac{5 R}{36}, \frac{8 R}{9}, \frac{15 R}{16}$ (3) $\frac{3 R}{4}, \frac{3 R}{16}, \frac{7 R}{144}$ (4) $\frac{5 R}{36}, \frac{3 R}{16}, \frac{21 R}{100}$ 65. $If m and e are the mass and charge of the revolving electron in the orbit of radius r for hydrogen atom, the total energy of the revolving electron will be$ (1) $\frac{1}{2} \frac{e ^{2}}{r}$ (2) $- \frac{e ^{2}}{r}$ (3) $\frac{m e ^{2}}{r}$ (4) $- \frac{1}{2} \frac{e ^{2}}{r}$ 66. $Find the correct set with isoelectronic species?$ (1) $N^{3 -}, F^{-}, O_{2}, Ca^{2 +}$ (2) $Ca^{2 +}, Cl^{-}, Al^{3 +}, O_{2}^{-}$ (3) $N^{3 -}, Mg^{2 +}, F^{-}, O^{2 -}$ (4) $Mg^{2 +}, O_{2}^{-}, Cl^{-}, N_{3}^{-}$ 67. $The order of filling of electrons in the orbitals of an atom will be$ (1) $3 d, 4 s, 4 p, 4 d, 5 s$ (2) $4 s, 3 d, 4 p, 5 s, 4 d$ (3) $5 s, 4 p, 3 d, 4 d, 5 s$ (4) $3 d, 4 p, 4 s, 4 d, 5 s$ 68. $What is the maximum numbers of electrons that can be associated with the following set of quantum numbers? n = 3, l = 1 and m = - 1$ (1) $4$ (2) $2$ (3) $10$ (4) $6$ 69. $The correct set of four quantum numbers for the valence electrons of rubidium atom (Z = 37) is:$ (1) $5, 0, 0, + \frac{1}{2}$ (2) $5, 1, 0, + \frac{1}{2}$ (3) $5,1, 1, + \frac{1}{2}$ (4) $5, 0, 1, + \frac{1}{2}$ 70. $Which of the following statements is incorrect?$ (1) $Splitting of spectral lines in electrical field is called Stark effect.$ (2) $Frequency of emitted radiation from a black body goes from a lower wavelength of higher wavelength as the temperature increases.$ (3) $Photon has momentum as well as wavelength.$ (4) $Rydberg constant has unit of energy.$ 71. $Which of the following electron arrangement does not obey Hund's rule?$ (1) (2) (3) (4) 72. $The orbital with 4 radial and 1 angular nodes is$ (1) $5 p_{y}$ (2) $6 p_{z}$ (3) $4 d_{xy}$ (4) $5 d_{yz}$ 73. $For hydrogen atom, the orbital/s with lowest energy is/are : (A) 4 s (B) 3 p_{x} (C) 3 d_{x^{2} - y^{2}} (D) 3 d_{z^{2}} (E) 4 p_{z} Choose the correct answer from the options given below:$ (1) $(B), (C) and (D) only$ (2) $(A) and (E) only$ (3) $(A) only$ (4) $(B) only$ 74. $Wavelength of H^{+} ion with kinetic energy 1.65 eV is (mass of proton = 1.6726 \times 10^{- 27} kg)$ (1) $1.22 nm$ (2) $0.22 nm$ (3) $0.022 nm$ (4) $0.122 nm$ 75. $The energy (in J) released when an excited electron of 5^{th} orbit of hydrogen atom returns to its ground state is$ (1) $2.091 \times 10^{- 18}$ (2) $4.182 \times 10^{- 18}$ (3) $6.273 \times 10^{- 18}$ (4) $8.364 \times 10^{- 18}$ 76. $The radius of first Bohr orbit of hydrogen atom is same as that of orbit (n) of hydrogen like species X. (n) and X respectively are$ (1) $(2), Li^{2 +}$ (2) $(3), Li^{2 +}$ (3) $(2), Be^{3 +}$ (4) $(2), He^{+}$ 77. $The maximum number of electrons in a subshell is given by the expression$ (1) $4 l - 2$ (2) $4 l + 2$ (3) $2 l + 2$ (4) $2 n^{2}$ 78. $Which from following rule/principle states that "No two electrons in an atom can have the same set of four quantum numbers".$ (1) $Pauli's exclusion principle$ (2) $Hund's rule$ (3) $Aufbau rule$ (4) $Heisenberg uncertainty principle$ 79. $The relation between n_{m}, (n_{m} =) the number of permissible values of magnetic quantum number (m)) for a given value of azimuthal quantum number (1), is$ (1) $n_{m} = l + 2$ (2) $l = \frac{n _{m} - 1}{2}$ (3) $l = 2 n_{m} + 1$ (4) $n_{m} = 2 l^{2} + 1$ 80. $In a multielectron atom, which of the following orbitals described by three quantum numbers will have same energy in absence of electric and magnetic fields? (A) n = 1, l = 0, m_{1} = 0 (B) n = 2, l = 0, m_{1} = 0 (C) n = 2, l = 1, m_{1} = 1 (D) n = 3, l = 2, m_{1} = 1 (E) n = 3, l = 2, m_{1} = 0 Choose the correct answer from the options given below:$ (1) $B and C Only$ (2) $A and B Only$ (3) $C and D Only$ (4) $D and E Only$ 81. $Given below are two statement: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : 5f electron can participate in bonding to a far greater extent than 4f electrons Reason R : 5f orbitals are not as buried as 4f orbitals In the light of the above statements, choose the correct answer from the options given below$ (1) $A is false but R is true$ (2) $Both A and R are true and R is the correct explanation of A$ (3) $A is true but R is false$ (4) $Both A and R are true but R is NOT the correct explanation of A$ 82. $In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inner-orbit jumps of the electron for Bohr orbits in an atom of hydrogen?$ (1) $3 \to 2$ (2) $5 \to2$ (3) $4 \to1$ (4) $2 \to 5$ 83. $The maximum number of electrons present in an orbital with n = 4, l = 3 is$ (1) $06$ (2) $14$ (3) $10$ (4) $2$ 84. $The energy required by electrons, present in the first Bohr orbit of hydrogen atom to be excited to second Bohr orbit is____Jmol^{- 1} . Given: R_{H} = 2.18 \times 10^{- 11} ergs .$ (1) $9.835 \times 10^{12}$ (2) $1.635 \times 10^{- 18}$ (3) $1.635 \times 10^{- 11}$ (4) $9.835 \times 10^{5}$ 85. $If a_{0} is denoted as the Bohr radius of hydrogen atom, then what is the de-Broglie wavelength (λ) of the electron present in the second orbit of hydrogen atom? [ n : any integer]$ (1) $\frac{8 π a _{0}}{n}$ (2) $\frac{2 a _{0}}{nπ}$ (3) $\frac{4 n}{π a _{0}}$ (4) $\frac{4 π a _{0}}{n}$ 86. $Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region?$ (1) $Brackett series$ (2) $Lyman series$ (3) $Balmer series$ (4) $Paschen series$ 87. $The work function of sodium metal is 4.41 \times 10^{- 19} J . If photons of wavelength 300 nm are incident on the metal, the kinetic energy of the ejected electrons will be (h = 6.63 \times 10^{- 34} Js c = 3 \times 10^{8} m / s) ⟶ 10^{- 21} J$ 88. $The total number of isoelectronic species from the given set is________. O^{2 -}, f^{-}, Al, M g^{2 +}, N a^{+}, O^{+}, Mg, A 1^{3 +}, F$ 89. $The wavelength of an electron and a neutron will become equal when the velocity of the electron is x times the velocity of neutron. The value of x is__________. (Nearest Integer) (Mass of electron is 9.1 x 1 0^{- 31} kg and mass of neutron is 1.6 x 1 0^{- 27} kg)$ 90. $The number of orbitals with n = 5, m_{1} = + 2 is (Round off to the Nearest Integer).$