Atomic Structure PYQs Set 6 (PDF)

Set 6 of 14 · Questions 151-180 of 415

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Atomic Structure · Set 6 (Q151-180)
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151. $The electronic configuration of Cr^{3 +} is$ (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) $[Ar] 3 d^{5} 4 s^{1}$ 152. $The electronic configuration of Cu^{2 +} ion is$ (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) $[Ar] 3 d^{8} 4 s^{0}$ 153. $The electrons identified by quantum numbers n and λ: (1) n = 4, λ = 1 (2) n = 4, λ = 0 (3) n = 3, λ = 2 (4) n = 3, λ = 1 can be placed in order of increasing energy as :$ (1) $(3) < (4) < (2) < (1)$ (2) $(4) < (2) < (3) < (1)$ (3) $(2) < (4) < (1) < (3)$ (4) $(1) < (3) < (2) < (4)$ 154. $Two particles A and B are in motion. If the wavelength associated with ' A' is 33.33 nm, the wavelength associated with ' B' whose momentum is 1/ 3^{rd} of ' A' is$ (1) $1.0 \times 10^{- 8} m$ (2) $2.5 \times 10^{- 8} m$ (3) $1.25 \times 10^{- 7} m$ (4) $1.0 \times 10^{- 7} m$ 155. $Which of the graphs shown below does not represent the relationship between incident light and the electron ejected from metal surface?$ (1) (2) (3) (4) 156. $Energy of an electron is given by E = -2.178 \times 10-18 J (\frac{Z ^{2}}{n ^{2}}) . Wavelength of light required to excite an electron in an hydrogen atom from level n = 1 to n = 2 will be: (h = 6.62 \times 10-34 Js and c = 3.0 \times 108 ms^{-1}$ (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) $8.500 \times 1 0^{-7} m$ 157. $The wavelength of electron in the first orbit of hydrogen atom is 3, 3 \times 10^{- 10} m . The kinetic energy of electron (in J) is (h = 6.6 \times 10^{- 34} Js, m_{e} = 9.0 \times 10^{- 31} kg)$ (1) $3.33 \times 10^{- 17}$ (2) $1.11 \times 10^{- 18}$ (3) $2.22 \times 10^{- 18}$ (4) $2.22 \times 10^{- 17}$ 158. $The electronic configuration of Einsteinium is : (Given atomic number of Einsteinium = 99)$ (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) $[Rn] 5 f^{12} 6 d^{\circ} 7 s^{2}$ 159. $The correct order of decreasing energy for the electrons whose quantum numbers n and l are given below, is A. n = 5 and l = 2 B. n = 5 and l = 0 C. n = 4 and l = 3 D. n = 4 and l = 1$ (1) $A > C > B > D$ (2) $A > B > C > D$ (3) $C > A > D > B$ (4) $A > B > D > C$ 160. $The number of d ‐electrons in F e_{(}^{2 +} Z = 2 6_{)} is not equal to the number of electrons in which one of the following?$ (1) $d ‐electrons in Fe$ (2) $p ‐electrons in Ne$ (3) $s ‐electrons in Mg$ (4) $p ‐electrons in Cl$ 161. $Ejection of the photoelectron from metal in the photoelectric effect experiment can by stopped by applying 0.5 V when the radiation of 250 nm is used. The work function of the metal is :$ (1) $4 eV$ (2) $5.5 eV$ (3) $4.5 eV$ (4) $5 eV$ 162. $Which of the activities can be compared to the concept of quantisation?$ (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) $Throwing a playing disc$ 163. $What is the mass in gram of 1 atom of an element if its atomic mass is 10 u ?$ (1) $2.06056 \times 10^{- 22} g$ (2) $1.06056 \times 10^{- 24} g$ (3) $1.66056 \times 10^{- 23} g$ (4) $3.66056 \times 10^{- 25} g$ 164. $The work function of a metal M is 6.3 eV . The wave length of the incident radiation required to just eject the electrons from its surface (in nm) is$ (1) $102$ (2) $330$ (3) $197$ (4) $310$ 165. $According to Bohr's atomic theory : (A) Kinetic energy of electron is \propto \frac{Z ^{2}}{n ^{2}} (B) The product of velocity (v) of electron and principal quantum number (n), ' v n' \propto Z^{2} . (C) Frequency of revolution of electron in an orbit is \propto \frac{Z ^{3}}{n ^{3}} . (D) Coulombic force of attraction on the electron is \propto \frac{Z ^{3}}{n ^{4}} . Choose the most appropriate answer from the options given below:$ (1) $(C) only$ (2) $(A) and (D) only$ (3) $(A) only$ (4) $(A), (C) and (D) only$ 166. $If the shortest wavelength in Lyman series of hydrogen atom is A, then the longest wavelength in Paschen series of H e^{+} is:$ (1) $\frac{36 A}{5}$ (2) $\frac{9 A}{5}$ (3) $\frac{5 A}{9}$ (4) $\frac{36 A}{7}$ 167. $Which orbital among the following has zero radial nodes and 2 angular nodes?$ (1) $4 s$ (2) $3 d$ (3) $2 p$ (4) $5 s$ 168. $Given The mass of electron is 9.11 \times 1 0^{- 31} k g, Planck constant is 6. 626 \times 1 0^{- 34} J s, the uncertainty involved in the measurement of velocity within a distance of 0.1 Å is$ (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) $5.79 \times 1 0^{8} m s^{- 1}$ 169. $The de Broglie wavelength of a particle is 1000 nm . What is its momentum? (h = 6.6 \times 10^{- 34} J s)$ (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) $6.6 \times 10^{- 26} J s m$ 170. $The sum of electrons present in all sub shells of an atom with m_{s} value of + \frac{1}{2} for n = 4 and m_{s} value of - \frac{1}{2} for n = 3 is$ (1) $25$ (2) $16$ (3) $09$ (4) $32$ 171. $The position of both, an electron and a helium atom are known within 1.0 nm. Further the momentum of the electron is known within 5.0 \times 1 0^{- 26} kg m s^{- 1} . The minimum uncertainty in the measurement of the momentum of the helium atom is$ (1) $8. 0 \times 1 0^{- 26} kg m s^{- 1}$ (2) $80 kg m s^{- 1}$ (3) $50 kg m s^{- 1}$ (4) $5. 0 \times 1 0^{- 26} kg m s^{- 1}$ 172. $Calculate the wave number of the photon emitted during transition from the orbit of n = 2 to n = 1 in hydrogen atom (R_{H} = 109677 cm^{- 1}) .$ (1) $27419.3 cm^{- 1}$ (2) $12064.5 cm^{- 1}$ (3) $109677.0 cm^{- 1}$ (4) $82257.8 cm^{- 1}$ 173. $Which of the following set of quantum numbers represents the highest energy of an atom ?$ (1) $n = 3, l = 0, m = 0, s = + \frac{1}{2}$ (2) $n = 3, l = 1, m =1, s = + \frac{1}{2}$ (3) $n = 3, l = 2, m = 1, s = + \frac{1}{2}$ (4) $n = 4, l = 0, m = 0, s = + \frac{1}{2}$ 174. $Match the following. List I A. Chadwick B. Rutherford C. Moseley D. J. J. Thomson List II 1.Cathode rays 2 X-rays spectra 3. Discovery of neutrons 4. Nuclear atom model A B C D$ (1) $4 1 2 3$ (2) $3 2 4 1$ (3) $3 2 1 4$ (4) $3 4 2 1$ 175. $If the principal quantum number n = 6, the correct sequence of filling of electrons will be :$ (1) $ns\tonp\to(n - 1)d\to(n - 2)f$ (2) $ns\to(n - 1)d\to(n - 2)f\tonp$ (3) $ns\to(n - 2)f\tonp\to(n - 1)d$ (4) $ns\to(n - 2)f\to(n - 1)d\tonp$ 176. $If the radius and energy of the second Bohr orbit of hydrogen atom is r_{2} and E_{2}, respectively. The radius and energy of the third Bohr orbit will be______ respectively.$ (1) $\frac{4}{9} r_{2}, \frac{9}{4} E_{2}$ (2) $\frac{4}{9} r_{2}, \frac{4}{9} E_{2}$ (3) $\frac{9}{4} r_{2}, \frac{4}{9} E_{2}$ (4) $\frac{9}{4} r_{2}, \frac{9}{4} E_{2}$ 177. $Heat treatment of muscular pain involves radiation of wavelength of about 900 nm. Which spectral line of H atom is suitable for this? Given : Rydberg constant R_{H} = 10^{5} cm^{- 1}, h = 6.6 \times 10^{- 34} J s, c = 3 \times 10^{8} m / s)$ (1) $Balmer series, \infty \to 2$ (2) $Lyman series, \infty \to 1$ (3) $Paschen series, \infty \to 3$ (4) $Paschen series, 5 \to 3$ 178. $The number of atomic orbitals from the following having 5 radial nodes is 7s, 7p, 6s, 8p, 8d$ 179. $The ionization energy of sodium in kJmol^{- 1} . If electromagnetic radiation of wavelength 242 nm is just sufficient to ionize sodium atom is_____$ 180. $Number of spectral lines obtained in He^{+} spectra, when an electron makes transition from fifth excited state to first excited state will be$