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JEE Main Atomic Structure questions

63 Chemistry questions on Atomic Structure as asked in JEE Main, newest first. 27 come with a worked solution.

  1. The shortest wavelength of hydrogen atom in Lyman series is λ. The longest wavelength in Balmer series of He^+ is

    2023 · with solution

  2. The number of s-electrons present in an ion with 55 protons in its unipositive state is

    2023

  3. The electric potential at the centre of two concentric half rings of radii R_1 and R_2, having same linear charge density λ is : [figure]

    2023

  4. Following figure shows spectrum of an ideal black body at four different temperatures. The number of correct statement/s from the following is __________ A. T_4 > T_3 > T_2 > T_1 B. The black body consists of particles…

    2023

  5. The number of given orbitals which have electron density along the axis is p_x, p_y, p_z, d_xy, d_xz, d_yz, d_x^2-y^2, d_z^2, s

    2023 · with solution

  6. If wavelength of the first line of the Paschen series of hydrogen atom is 720 nm, then the wavelength of the second line of this series is __________ nm. (Nearest integer)

    2023

  7. Among the following, the energy of 2s-orbital is lowest in

    2019 · with solution

  8. Which one of the following about an electron occupying the 1s-orbital in a hydrogen atom is incorrect? (The Bohr radius is represented by a_0)

    2019

  9. If p is the momentum of the fastest electron ejected from a metal surface after the irradiation of light having wavelength λ, then for 1.5 p momentum of the photoelectron, the wavelength of the light should be (Assume…

    2019

  10. The electrons are more likely to be found [figure]

    2019

  11. What is the work function of the metal, if the light of wavelength 4000 Å generates photoelectron of velocity 6 × 10^5 ms^-1 from it? (Mass of electron = 9 × 10^-31 kg Velocity of light = 3 × 10^8 ms^-1 Planck's…

    2019

  12. The ratio of the shortest wavelength of two spectral series of hydrogen spectrum is found to be about 9. The spectral series are

    2019 · with solution

  13. The ground state energy of hydrogen atom is -13.6 eV. The energy of second excited state of He^+ ion in eV is

    2019 · with solution

  14. The graph between |ψ|^2 and r (radial distance) is shown below. This represents [figure]

    2019 · with solution

  15. Which of the graphs shown below does not represent the relationship between incident light and the electron ejected from metal surface? [figure]

    2019

  16. For any given series of spectral lines of atomic hydrogen, let ΔV = V_max - V_min be the difference in maximum and minimum frequencies in cm^-1. The ratio ΔV_Lyman / ΔV_Balmer is

    2019 · with solution

  17. If the de-Broglie wavelength of the electron in n^th 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

    2019

  18. The de-Broglie wavelength (λ) associated with a photoelectron varies with the frequency (v) of the incident radiation as, [v_0 is threshold frequency]

    2019

  19. Which of the following combination of statements is true regarding the interpretation of the atomic orbitals? I. An electron in an orbital of high angular momentum stays away from the nucleus than an electron in the…

    2019

  20. For emission line of atomic hydrogen from n_i = 8 to n_f = n, the plot of wave number (ν) against (1/(n^2) ) will be (The Rydberg constant, R_H is in wave number unit)

    2019

  21. The radius of the second Bohr orbit for hydrogen atom is (Planck's constant (h) = 6.6262 × 10^-34 Js; mass of electron = 9.1091 × 10^-31 kg; charge of electron (e) = 1.60210 × 10^-19 C; permittivity of vacuum (ε_0) =…

    2017

  22. A stream of electrons from a heated filament was passed between two charged plates kept at a potential difference V esu. If e and m are charge and mass of an electron, respectively, then the value of h/λ (where, λ is…

    2016

  23. P is the probability of finding the 1s electron of hydrogen atom in a spherical shell of infinitesimal thickness, dr, at a distance r from the nucleus. The volume of this shell is 4π r^2 dr. The qualitative sketch of…

    2016

  24. Which of the following is the energy of a possible excited state of hydrogen?

    2015

  25. The correct set of four quantum numbers for the valence electrons of rubidium atom (Z = 37) is

    2013 · with solution

  26. Energy of an electron is given by E = -2.178 × 10^-18 J ((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 × 10^-34 Js and c = 3.0 × 10^8…

    2013

  27. The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom is [a_0 is Bohr radius]

    2012 · with solution

  28. Given that the abundances of isotopes _54Fe, _56Fe and _57Fe are 5%, 90% and 5%, respectively, the atomic mass of Fe is

    2009 · with solution

  29. The number of radial nodes in 3s and 2p respectively are

    2005 · with solution

  30. Which hydrogen like species will have same radius as that of Bohr orbit of hydrogen atom?

    2004 · with solution

  31. Rutherford's experiment, which established the nuclear model of the atom, used a beam of

    2002

  32. If the nitrogen atom had electronic configuration 1s^7, it would have energy lower than that of the normal ground state configuration 1s^2 2s^2 2p^3, because the electrons would be closer to the nucleus, yet 1s^7 is not…

    2002

  33. How many moles of electron weighs 1 kg?

    2002 · with solution

  34. The quantum numbers +1/2 and -1/2 for the electron spin represent

    2001

  35. The wavelength associated with a golf ball weighing 200 g and moving at a speed of 5 m/h is of the order

    2001 · with solution

  36. The number of nodal planes in a p_x orbital is

    2001 · with solution

  37. The electronic configuration of an element is 1s^2, 2s^2 2p^6, 3s^2 3p^6 3d^5, 4s^1. This represents its

    2000 · with solution

  38. The electrons, identified by quantum numbers n and l, (i) n = 4, l = 1, (ii) n = 4, l = 0, (iii) n = 3, l = 2, (iv) n = 3, l = 1 can be placed in order of increasing energy, from the lowest to highest, as

    1999

  39. The energy of an electron in the first Bohr orbit of H-atom is -13.6 eV. The possible energy value(s) of the excited state(s) for electrons in Bohr orbits of hydrogen is (are)

    1998 · with solution

  40. For a d-electron, the orbital angular momentum is

    1997

  41. The first use of quantum theory to explain the structure of atom was made by

    1997

  42. Which of the following has the maximum number of unpaired electrons?

    1996 · with solution

  43. The orbital angular momentum of an electron in 2s-orbital is

    1996

  44. Which of the following relates to photons both as wave motion and as a stream of particles?

    1992

  45. Which of the following does not characterise X-rays ?

    1992

  46. The correct set of quantum numbers for the unpaired electron of chlorine atom is

    1989 · with solution

  47. The correct ground state electronic configuration of chromium atom is

    1989 · with solution

  48. The outermost electronic configuration of the most electronegative element is

    1988 · with solution

  49. The orbital diagram in which the Aufbau principle is violated

    1988

  50. The wavelength of a spectral line for an electronic transition is inversely related to

    1988

  51. Rutherford's alpha particle scattering experiment eventually led to the conclusion that

    1986

  52. The ratio of the energy of a photon of 200 Å wavelength radiation to that of 4000 Å radiation is

    1986

  53. Which one of the following sets of quantum numbers represents an impossible arrangement? n l m s

    1986 · with solution

  54. The radius of an atomic nucleus is of the order of

    1985 · with solution

  55. Bohr's model can explain

    1985 · with solution

  56. Electromagnetic radiation with maximum wavelength is

    1985 · with solution

  57. The increasing order (lowest first) for the values of e/m (charge/mass) for electron (e), proton (p), neutron (n) and alpha particle (α) is

    1984

  58. Which electronic level would allow the hydrogen atom to absorb a photon but not to emit a photon?

    1984 · with solution

  59. Correct set of four quantum numbers for the valence (outermost) electron of rubidium (Z = 37) is

    1984

  60. Rutherford's scattering experiment is related to the size of the

    1983

  61. The principal quantum number of an atom is related to the

    1983

  62. Any p-orbital can accommodate upto

    1983

  63. Rutherford's experiment on scattering of α-particles showed for the first time that the atom has

    1981 · with solution

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