Atomic Structure Jee Main Selected
Atomic Structure Jee Main Selected
Atomic Structure Jee Main Selected
Atomic Structure
1. If the Thompson model of the atom was correct, then the result of Rutherford's gold foil
experiment would have been :
(A) All of the -particles pass through the gold foil without decrease in speed.
(B) -Particles are deflected over a wide range of angles.
(C) All -particles get bounced back by 180°
(D) -Particles pass through the gold foil deflected by small angles and with reduced speed.
[JEE Main, July 2021]
2. The figure that is not a direct manifestation of the quantum nature of atoms is :
Rb K
Kinetic Na
APNI KAKSHA 1
(Physical Chemistry) ASSIGNMENT (Class -11th)
5. The radius of the second Bohr orbit, in terms of the Bohr radius, a0, in Li2+ is :
2a 0 4a 0 2a 0 4a 0
(A) (B) (C) (D)
3 3 9 9
[Jee Main, 2020]
1 1
6. For the Balmer series in the spectrum of H atom, = R H 2 − 2 , the correct statements
n1 n 2
among (I) to (IV) are :
(I) As wavelength decreases, the lines in the series converge
(II) The integer n1 is equal to 2
(III) The lines of longest wavelength corresponds to n2 = 3
(IV) The ionization energy of hydrogen can be calculated from wave number of these lines
(A) (I), (III), (IV) (B) (I), (II), (III) (C) (II), (III), (IV) (D) (I), (II), (IV)
[Jee Main, 2020]
7. The ratio of the shortest wavelength of two special series of hydrogen spectrum is found to be
about 9. The spectral series are : (Atomic Structure)
(A) Paschen and Pfund (B) Balmer and Brackett
(C) Lyman and Paschen (D) Brackett and Pfund
[Jee Main, April 2019]
8. The work function of sodium metal is 4.41 × 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 × 10–34 J s; c =
3 × 108 m/s) _________ × 10–21 J. [Jee Main, 2020]
9. 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 × 10–31 kg and mass of neutron is 1. 6 × 10–27 kg)
[JEE Main, July 2022]
10. The minimum uncertainty in the speed of an electron in an one dimensional region of length
2a0 (Where a0 = Bohr radius 52.9 pm) is____________ km s–1.
APNI KAKSHA 2
(Physical Chemistry) ASSIGNMENT (Class -11th)
(Given: Mass of electron = 9.1 × 10–31 kg, Planck's constant h = 6.63 × 10–34 Js)
[JEE Main, July 2022]
11. Identify the incorrect statement from the following.
(A) A circular path around the nucleus in which an electron moves is proposed as Bohr's orbit.
(B) An orbital is the one electron wave function () in an atom.
(C) The existence of Bohr's orbits is supported by hydrogen spectrum.
(D) Atomic orbital is characterized by the quantum numbers n and l only
[JEE Main, July 2022]
12. The correct statement about probability density (except at infinite distance from nucleus) is :
(A) It can negative for 2p orbital (B) It can be zero for 1s orbital
(C) It can never be zero for 2s orbital (D) It can be zero for 3p orbital
[Jee Main, 2020]
13. Which of the following is the correct plot for the probability density (r) as a function of
distance 'r' of the electron form the nucleus for 2s orbital?
(A) (B)
(C) (D)
APNI KAKSHA 3
(Physical Chemistry) ASSIGNMENT (Class -11th)
APNI KAKSHA 4
(Physical Chemistry) ASSIGNMENT (Class -11th)
ANSWER KEY
Atomic Structure
1 (D) 2. (B) 3. (2) 4. (C) 5. (B) 6. (B) 7. (C)
8. (222) 9. (1758)10. (548) 11. (D) 12. (D) 13. (B) 14. (C)
15. (0) 16. (B) 17. (A)
APNI KAKSHA 5