Atomic Structure PYQs Set 5 (PDF)

Set 5 of 12 · Questions 121-150 of 359

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Mere Teacher · Previous Year Questions NEET Chemistry · Atomic Structure · Set 5 (Q121-150)
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121. $Which is the correct order of increasing energy of the listed orbitals in the atom of titanium? (At. no. Z = 22)$ (1) $4 s 3 s 3 p 3 d$ (2) $3 s 3 p 3 d 4 s$ (3) $3 s 3 p 4 s 3 d$ (4) $3 s 4 s 3 p 3 d$ 122. $The wavelength of photon ' A ' is 400 nm. The frequency of photon ' B ' is 10^{16} s^{- 1} . The wave number of photon ' C^{’} is 10^{4} cm^{- 1} . The correct order of energy of these photons is:$ (1) $C > B > A$ (2) $B > A > C$ (3) $A > B > C$ (4) $A > C > B$ 123. $Electronic configuration of calcium atom can be written as$ (1) $[Ne] 4 p^{2}$ (2) $[Ar] 4 s^{2}$ (3) $[Ne] 4 s^{2}$ (4) $[Kr] 4 p^{2}$ 124. $Which of the following electronic configuration would be associated with the highest magnetic moment?$ (1) $[Ar] 3 d^{7}$ (2) $[Ar] 3 d^{8}$ (3) $[Ar] 3 d^{3}$ (4) $[Ar] 3 d^{6}$ 125. $The approximate ratio of the speed of light in vacuum to that of an electron in the first Bohr orbit of hydrogen atom is$ (1) $100 : 1$ (2) $137 : 1$ (3) $157 : 1$ (4) $191 : 1$ 126. $Uncertainity in position of a particle of 25 g in space is 1 0^{-15} m. Hence, Uncertainity in velocity (in m. se c^{-1}) is: (plank’s constant, h = 6.6 ´ 1 0^{-34} Js)$ (1) $2.1 ´ 1 0^{-18}$ (2) $2.1 ´ 1 0^{-34}$ (3) $0.5 ´ 1 0^{-34}$ (4) $5.0 ´ 1 0^{-24}$ 127. $The electron in the hydrogen atom undergoes transition from higher orbitals to orbitals of radius 211.6 pm. This transition is associated with$ (1) $Paschen series$ (2) $Brackett series$ (3) $Lyman series$ (4) $Balmer series$ 128. $The numbers of d-electrons retained in F e^{2 +} (atomic number Fe = 26) ion is$ (1) $3$ (2) $4$ (3) $5$ (4) $6$ 129. $With what velocity must an electron travel, so that its momentum is equal to that of a photon of wavelength 663 nm ?$ (1) $1098 m / s$ (2) $109.8 m / s$ (3) $10.98 m / s$ (4) $1.098 m / s$ 130. $If the de Broglie wavelength of the electron in n^{t h} Bohr orbit in a hydrogenic atom is equal to 1.5 π a_{0} (a_{0} is Bohr radius), then the value of n/z is:$ (1) $0.75$ (2) $0.40$ (3) $1.0$ (4) $1. 50$ 131. $The electronic configuration of Cr^{3 +} is$ (1) $[Ar] 3 d^{4} 4 s^{2}$ (2) $[Ar] 3 d^{3} 4 s^{0}$ (3) $[Ar] 3 d^{2} 4 s^{1}$ (4) $[Ar] 3 d^{5} 4 s^{1}$ 132. $The electronic configuration of Cu^{2 +} ion is$ (1) $[Ar] 3 d^{8} 4 s^{1}$ (2) $[Ar] 3 d^{9} 4 s^{0}$ (3) $[Ar] 3 d^{7} 4 s^{2}$ (4) $[Ar] 3 d^{8} 4 s^{0}$ 133. $The electrons identified by quantum numbers n and λ: (1) n = 4, λ = 1 (2) n = 4, λ = 0 (3) n = 3, λ = 2 (4) n = 3, λ = 1 can be placed in order of increasing energy as :$ (1) $(3) < (4) < (2) < (1)$ (2) $(4) < (2) < (3) < (1)$ (3) $(2) < (4) < (1) < (3)$ (4) $(1) < (3) < (2) < (4)$ 134. $Two particles A and B are in motion. If the wavelength associated with ' A' is 33.33 nm, the wavelength associated with ' B' whose momentum is 1/ 3^{rd} of ' A' is$ (1) $1.0 \times 10^{- 8} m$ (2) $2.5 \times 10^{- 8} m$ (3) $1.25 \times 10^{- 7} m$ (4) $1.0 \times 10^{- 7} m$ 135. $Which of the graphs shown below does not represent the relationship between incident light and the electron ejected from metal surface?$ (1) (2) (3) (4) 136. $Energy of an electron is given by E = -2.178 \times 10-18 J (\frac{Z ^{2}}{n ^{2}}) . Wavelength of light required to excite an electron in an hydrogen atom from level n = 1 to n = 2 will be: (h = 6.62 \times 10-34 Js and c = 3.0 \times 108 ms^{-1}$ (1) $1.214 \times 1 0^{-7} m$ (2) $2.816 \times 1 0^{-7} m$ (3) $6.500 \times 1 0^{-7} m$ (4) $8.500 \times 1 0^{-7} m$ 137. $The wavelength of electron in the first orbit of hydrogen atom is 3, 3 \times 10^{- 10} m . The kinetic energy of electron (in J) is (h = 6.6 \times 10^{- 34} Js, m_{e} = 9.0 \times 10^{- 31} kg)$ (1) $3.33 \times 10^{- 17}$ (2) $1.11 \times 10^{- 18}$ (3) $2.22 \times 10^{- 18}$ (4) $2.22 \times 10^{- 17}$ 138. $The electronic configuration of Einsteinium is : (Given atomic number of Einsteinium = 99)$ (1) $[Rn] 5 f^{10} 6 d^{\circ} 7 s^{2}$ (2) $[Rn] 5 f^{13} 6 d^{\circ} 7 s^{2}$ (3) $[Rn] 5 f^{11} 6 d^{\circ} 7 s^{2}$ (4) $[Rn] 5 f^{12} 6 d^{\circ} 7 s^{2}$ 139. $The correct order of decreasing energy for the electrons whose quantum numbers n and l are given below, is A. n = 5 and l = 2 B. n = 5 and l = 0 C. n = 4 and l = 3 D. n = 4 and l = 1$ (1) $A > C > B > D$ (2) $A > B > C > D$ (3) $C > A > D > B$ (4) $A > B > D > C$ 140. $The number of d ‐electrons in F e_{(}^{2 +} Z = 2 6_{)} is not equal to the number of electrons in which one of the following?$ (1) $d ‐electrons in Fe$ (2) $p ‐electrons in Ne$ (3) $s ‐electrons in Mg$ (4) $p ‐electrons in Cl$ 141. $Ejection of the photoelectron from metal in the photoelectric effect experiment can by stopped by applying 0.5 V when the radiation of 250 nm is used. The work function of the metal is :$ (1) $4 eV$ (2) $5.5 eV$ (3) $4.5 eV$ (4) $5 eV$ 142. $Which of the activities can be compared to the concept of quantisation?$ (1) $A car is travelling on the road$ (2) $An apple is falling form the tree$ (3) $A person can stand on any step of a stair case$ (4) $Throwing a playing disc$ 143. $What is the mass in gram of 1 atom of an element if its atomic mass is 10 u ?$ (1) $2.06056 \times 10^{- 22} g$ (2) $1.06056 \times 10^{- 24} g$ (3) $1.66056 \times 10^{- 23} g$ (4) $3.66056 \times 10^{- 25} g$ 144. $The work function of a metal M is 6.3 eV . The wave length of the incident radiation required to just eject the electrons from its surface (in nm) is$ (1) $102$ (2) $330$ (3) $197$ (4) $310$ 145. $According to Bohr's atomic theory : (A) Kinetic energy of electron is \propto \frac{Z ^{2}}{n ^{2}} (B) The product of velocity (v) of electron and principal quantum number (n), ' v n' \propto Z^{2} . (C) Frequency of revolution of electron in an orbit is \propto \frac{Z ^{3}}{n ^{3}} . (D) Coulombic force of attraction on the electron is \propto \frac{Z ^{3}}{n ^{4}} . Choose the most appropriate answer from the options given below:$ (1) $(C) only$ (2) $(A) and (D) only$ (3) $(A) only$ (4) $(A), (C) and (D) only$ 146. $If the shortest wavelength in Lyman series of hydrogen atom is A, then the longest wavelength in Paschen series of H e^{+} is:$ (1) $\frac{36 A}{5}$ (2) $\frac{9 A}{5}$ (3) $\frac{5 A}{9}$ (4) $\frac{36 A}{7}$ 147. $Which orbital among the following has zero radial nodes and 2 angular nodes?$ (1) $4 s$ (2) $3 d$ (3) $2 p$ (4) $5 s$ 148. $Given The mass of electron is 9.11 \times 1 0^{- 31} k g, Planck constant is 6. 626 \times 1 0^{- 34} J s, the uncertainty involved in the measurement of velocity within a distance of 0.1 Å is$ (1) $5.79 \times 1 0^{5} m s^{- 1}$ (2) $5.79 \times 1 0^{6} m s^{- 1}$ (3) $5.79 \times 1 0^{7} m s^{- 1}$ (4) $5.79 \times 1 0^{8} m s^{- 1}$ 149. $The de Broglie wavelength of a particle is 1000 nm . What is its momentum? (h = 6.6 \times 10^{- 34} J s)$ (1) $6.6\times 1 0^{- 25} J s m-1$ (2) $6.6 \times 10^{- 25} J s m$ (3) $6.6 \times 10^{- 28} J s m^{- 1}$ (4) $6.6 \times 10^{- 26} J s m$ 150. $The sum of electrons present in all sub shells of an atom with m_{s} value of + \frac{1}{2} for n = 4 and m_{s} value of - \frac{1}{2} for n = 3 is$ (1) $25$ (2) $16$ (3) $09$ (4) $32$