March 07, 2012

Atomic Structure - II One Mark Questions

1. ____would has the maximum de Broglie wavelength?
a) Proton                       b) Neutron                   c) α - particle               d) β - particle.
2. de Broglie equation is
a) λ = mv / h      b) λ = hmv                   c) λ = hv / m                            d) λ = h / mv
3. Dual character of an electron was explained by
a) Bohr              b) Heisenberg              c) de Broglie                           d) Pauli.
4. En = -313.6/n2, If the value of En = -34.84 to which value ‘n’ corresponds to
a) 4                    b) 3                              c) 2                                          d) 1
5. Energy levels of molecular orbitals have been determined experimentally by
a) Spectroscopic studies                        b) X-ray diffraction
c) Crystallographic studies                    d) none of these.
6. If the energy of an electron in the second Bohr orbit of H-atom is -E, what is the energy of the electron in the Bohr's first orbit?
a) 2E                  b) -4E                          c) -2E                                      d) 4E.
7. In a molecule eight electrons are present in bonding molecular orbital and four electrons are present in anti-bonding molecular orbital. Its bond order is
a) 3                    b) 1                              c) 2.5                                       d) 2.
8. Inter-molecular hydrogen bonding is present in
a) HF                 b) H2O                        c) ethanol                                d) all of these. /
a) o-nitrophenol b) salicylic acid    c) o-hydroxy benzaldehyde    d) hydrogen fluoride.
9. Intramolecular hydrogen bonding is present in
a) o-nitrophenol  b) m-nitrophenol         c) p-nitrophenol           d) p-aminophenol /
a) o-nitrophenol b) m-nitrophenol  c) p-nitrophenol    d) p-hydroxy benzaldehyde /
a) o-nitrophenol  b) m-nitrophenol         c) p-nitrophenol           d) none of these.
10. Molecular orbital with the least energy is
a) σ1s                b) σ*1s                        c) π2py                                    d) π *2py
11. Number of spherical nodes in 2s orbital is
a) 1                    b) 2                              c) 3                                          d) 4.
12. The bond order of nitrogen molecule is
a) 2.5                 b) 3                              c) 2                                          d) 4.
13. The bond order of oxygen molecule is
a) 2.5                 b) 1                              c) 3                                          d) 2.
14. The circumference of the circular orbit of an electron is an integral multiple of its
a) frequency      b) momentum              c) mass                                    d) wavelength.
15. The hybridisation / The nature of hybridisation in IF7 molecule is
a) sp3d              b) sp3d2                      c) sp3                                       d) sp3d3.
16. The hybridisation in CO32- ion is
a) sp2                 b) sp3                          c) sp                                         d) sp3d.
17. The hybridisation in SF6 molecule is
a) sp3                 b) sp3d                        c) sp3d2                                  d) sp3d3.
18. The hybridisation in SO42- ion is
a) sp3                 b) sp3d2                      c) sp3d                                    d) sp3d3.
19. The hybridisation involved in XeF6 is
a) sp3d3            b) sp3d2                      c) sp3d                                    d) sp3.
20. The momentum of a particle which has de-Broglie wavelength of 1 Å (h =.6.626 x 10-34 kgm2s–1) is
a) 6.63 x 10-23 kgms–1                b) 6.63 x 10-24 kgms–1 
c) 6.63 x 10-34 kgms–1              d) 6.63 x 1034 kgms–1
21. Which of the following particles having same kinetic energy?
a) α-particle       b) proton                     c) β-particle                             d) neutron
22. Which one of the following experiments confirmed the wave nature of electron?
a) G.P. Thomson's gold foil experiment           b) Black body radiation
c) Photoelectric effect                                       d) Millikan's oil-drop experiment.
23. Water exists in liquid state. This is due to
a) high boiling point   b) low boiling point   c) freezing point is zero  d) hydrogen bond.
24. The hybridisation in ICl4 ion is
a) sp3                       b) sp3d                      c) sp3d2                      d) sp3d3


  1. sir,
    thank you very much for your work. if you put online test mode it will be very useful for many who can do online test atleast for one mark.
    thank you

    1. Thank you. After a long try, Just a week ago I included Online Test only for One Mark to test the level of understanding the lesson. Once again I thank you for giving me a chance to improve this blog.

  2. Thank you for sharing this blog and very useful for understanding important key points