Atomic Structure PYQs Set 3 (PDF)

Set 3 of 12 · Questions 61-90 of 359

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Mere Teacher · Previous Year Questions NEET Chemistry · Atomic Structure · Set 3 (Q61-90)
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61. $Which of the following statements is incorrect?$ (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) $Rydberg constant has unit of energy.$ 62. $Which of the following electron arrangement does not obey Hund's rule?$ (1) (2) (3) (4) 63. $The orbital with 4 radial and 1 angular nodes is$ (1) $5 p_{y}$ (2) $6 p_{z}$ (3) $4 d_{xy}$ (4) $5 d_{yz}$ 64. $For hydrogen atom, the orbital/s with lowest energy is/are : (A) 4 s (B) 3 p_{x} (C) 3 d_{x^{2} - y^{2}} (D) 3 d_{z^{2}} (E) 4 p_{z} Choose the correct answer from the options given below:$ (1) $(B), (C) and (D) only$ (2) $(A) and (E) only$ (3) $(A) only$ (4) $(B) only$ 65. $Wavelength of H^{+} ion with kinetic energy 1.65 eV is (mass of proton = 1.6726 \times 10^{- 27} kg)$ (1) $1.22 nm$ (2) $0.22 nm$ (3) $0.022 nm$ (4) $0.122 nm$ 66. $The energy (in J) released when an excited electron of 5^{th} orbit of hydrogen atom returns to its ground state is$ (1) $2.091 \times 10^{- 18}$ (2) $4.182 \times 10^{- 18}$ (3) $6.273 \times 10^{- 18}$ (4) $8.364 \times 10^{- 18}$ 67. $The radius of first Bohr orbit of hydrogen atom is same as that of orbit (n) of hydrogen like species X. (n) and X respectively are$ (1) $(2), Li^{2 +}$ (2) $(3), Li^{2 +}$ (3) $(2), Be^{3 +}$ (4) $(2), He^{+}$ 68. $The maximum number of electrons in a subshell is given by the expression$ (1) $4 l - 2$ (2) $4 l + 2$ (3) $2 l + 2$ (4) $2 n^{2}$ 69. $Which from following rule/principle states that "No two electrons in an atom can have the same set of four quantum numbers".$ (1) $Pauli's exclusion principle$ (2) $Hund's rule$ (3) $Aufbau rule$ (4) $Heisenberg uncertainty principle$ 70. $The relation between n_{m}, (n_{m} =) the number of permissible values of magnetic quantum number (m)) for a given value of azimuthal quantum number (1), is$ (1) $n_{m} = l + 2$ (2) $l = \frac{n _{m} - 1}{2}$ (3) $l = 2 n_{m} + 1$ (4) $n_{m} = 2 l^{2} + 1$ 71. $In a multielectron atom, which of the following orbitals described by three quantum numbers will have same energy in absence of electric and magnetic fields? (A) n = 1, l = 0, m_{1} = 0 (B) n = 2, l = 0, m_{1} = 0 (C) n = 2, l = 1, m_{1} = 1 (D) n = 3, l = 2, m_{1} = 1 (E) n = 3, l = 2, m_{1} = 0 Choose the correct answer from the options given below:$ (1) $B and C Only$ (2) $A and B Only$ (3) $C and D Only$ (4) $D and E Only$ 72. $Given below are two statement: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : 5f electron can participate in bonding to a far greater extent than 4f electrons Reason R : 5f orbitals are not as buried as 4f orbitals In the light of the above statements, choose the correct answer from the options given below$ (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) $Both A and R are true but R is NOT the correct explanation of A$ 73. $In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inner-orbit jumps of the electron for Bohr orbits in an atom of hydrogen?$ (1) $3 \to 2$ (2) $5 \to2$ (3) $4 \to1$ (4) $2 \to 5$ 74. $The maximum number of electrons present in an orbital with n = 4, l = 3 is$ (1) $06$ (2) $14$ (3) $10$ (4) $2$ 75. $The energy required by electrons, present in the first Bohr orbit of hydrogen atom to be excited to second Bohr orbit is____Jmol^{- 1} . Given: R_{H} = 2.18 \times 10^{- 11} ergs .$ (1) $9.835 \times 10^{12}$ (2) $1.635 \times 10^{- 18}$ (3) $1.635 \times 10^{- 11}$ (4) $9.835 \times 10^{5}$ 76. $If a_{0} is denoted as the Bohr radius of hydrogen atom, then what is the de-Broglie wavelength (λ) of the electron present in the second orbit of hydrogen atom? [ n : any integer]$ (1) $\frac{8 π a _{0}}{n}$ (2) $\frac{2 a _{0}}{nπ}$ (3) $\frac{4 n}{π a _{0}}$ (4) $\frac{4 π a _{0}}{n}$ 77. $Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region?$ (1) $Brackett series$ (2) $Lyman series$ (3) $Balmer series$ (4) $Paschen series$ 78. $The energy of one mole of photons of radiation of wavelength 300 nm is (Given : h = 6.63 x 1 0^{- 34} Js, N_{A} = 6.02 x 1 0^{23} m o l^{- 1}, c = 3x 1 0^{8} m s^{- 1})$ (1) $235 kJ m o l^{- 1}$ (2) $325 kJ m o l^{- 1}$ (3) $399 kJ m o l^{- 1}$ (4) $435 kJ m o l^{- 1}$ 79. $The energy of an electron in an orbit of hydrogen like ion with an orbit radius of 52.9 pm in J is (ground state energy of electron in hydrogen atom is (= - 2.18 \times 10^{- 18} J)$ (1) $- 4.36 \times 10^{- 18}$ (2) $- 1.09 \times 10^{- 17}$ (3) $- 8.72 \times 10^{- 18}$ (4) $- 6.54 \times 10^{- 18}$ 80. $Two electrons occupying the same orbital are distinguished by$ (1) $azimuthal quantum number$ (2) $spin quantum number$ (3) $principal quantum number$ (4) $magnetic quantum number$ 81. $The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are :$ (1) $16, 5 and 2$ (2) $15, 5 and 3$ (3) $16, 6 and 3$ (4) $15, 6 and 2$ 82. $The energy of first (lowest) Balmer line of H atom is x J . The energy (in J) of second Balmer line of H atom is:$ (1) $1.35 x$ (2) $x^{2}$ (3) $2 x$ (4) $\frac{x}{1.35}$ 83. $Excited hydrogen atom emits light in the ultraviolet region at 2.47 \times 1 0^{15} Hz With thi frequency, the energy of a single photon is : (h = 6.63 \times 1 0^{-34} Js)$ (1) $8.041 \times 1 0^{-40} J$ (2) $8.041 \times 1 0^{-19} J$ (3) $1.640 \times 1 0^{-18} J$ (4) $6.111 \times 1 0^{-17} J$ 84. $The correct decreasing order of energy, for the orbitals having, following set of quantum numbers: (A) n = 3,l = 0,m=0 (B) n = 4,1 = 0, m = 0 (C) n = 3,l=1,m = 0 (D) n = 3,l = 2,m=l$ (1) $(D)>(B)>(C)>(A)$ (2) $(B) > (D) > (C) > (A)$ (3) $(C) > (B) > (D) > (A)$ (4) $(B) > (C) > (D) > (A)$ 85. $The product of uncertainty in velocity and uncertainty in position of a micro particle of mass ' m' is not less than in which of the following?$ (1) $h \times \frac{3 π}{m}$ (2) $\frac{h}{3 π} \times m$ (3) $\frac{h}{4 π} \times \frac{1}{m}$ (4) $\frac{h}{4 π} \times m$ 86. $Identify the impossible quantum number set for the electron from the following$ (1) $n = 2, l = 0, m = 0, s = - \frac{1}{2}$ (2) $n = 2, l = 1, m = 0, s = \frac{1}{2}$ (3) $n = 3, l = 3, m = 1, s = \frac{1}{2}$ (4) $n = 4, l = 2, m = 1, s = \frac{1}{2}$ 87. $An orbital with one angular node shows three maxima in its radial probability distribution curve, the orbital is$ (1) $3 s$ (2) $4 p$ (3) $5 d$ (4) $3 p$ 88. $The radius of the second Bohr orbit for hydrogen atom is: (Planck's Const. h = 6.6262 \times 1 0^{- 34} Js; mass of electron = 9.1091 \times 1 0^{- 31} kg; charge of electron e = 1.60210 \times 1 0^{- 19} C; permittivity of vacuum \in0 = 8.854185 \times 1 0^{- 12} kg^{-1} m^{-3} A^{2})$ (1) $4.76 Å$ (2) $0.529 Å$ (3) $2.12 Å$ (4) $1.65 Å$ 89. $Who modified Bohr’s theory by introducing elliptical orbits for electron path?$ (1) $Rutherford$ (2) $Thomson$ (3) $Hund$ (4) $Sommerfield$ 90. $The two electrons have the following sets of quantum numbers : P = 3, 2, - 2, + \frac{1}{2}; Q = 3, 0, 0, + \frac{1}{2} Which of the following statements is true?$ (1) $P has greater energy than Q .$ (2) $P and Q represent same electron.$ (3) $P and Q have same energy.$ (4) $P has lesser energy than Q .$