Chapter-2: Structure of Atom

1. The credit of discovering neutron goes to

• Rutherford
• Thomson
• Goldstein
• Chadwick

2. For principal quantum number n = 4, the total number of orbitals having l = 3 is

• 3
• 7
• 5
• 9

3. The maximum number of electrons that can be accommodated in fifth energy level is

• 10
• 25
• 50
• 32

4. The electronic transitions from n = 2 to n = 1 will produce shortest wavelength in (where n = principal quantum state)

• Li2+
• He+
• H
• H+

5. The magnetic quantum number specifies

• Size of orbitals
• Shape of orbitals
• Orientation of orbitals
• Nuclear Stability

6. Maximum number of electrons in a subshell with l = 3 and n = 4 is

• 10
• 12
• 14
• 16

7. The charge to mass ratio of α – particles is approximately …… the charge to mass ratio of protons

• Twice
• Half
• Four times
• Six times

8. In chromium atom, in ground state, the number of occupied orbitals is

• 14
• 15
• 7
• 12

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

• n = 2, Li2+
• n = 2, Be3+
• n = 2, He+
• n = 3, Li2+

10. Which of the following pair of ions have same paramagnetic moment?

• Cu+2, Ti+3
• Mn+2, Cu+2
• Ti+4, Cu+2
• Ti+3, Ni+2

11. Which of the following sets of quantum numbers represents the highest energy of an atom?

• n = 3, l = 0, m = 0, s = +1/2
• n = 3, l = 1, m = 1, s = +1/2
• n = 3, l = 2, m = 1, s = +1/2
• n = 4, l = 0, m = 0, s = +1/2

12. In a hydrogen atom, if energy of an electron in ground state is 13.6 eV, then that in the 2nd excited state is

• 1.51 eV
• 3.4 eV
• 6.04 eV
• 13.6 eV

13. A sub-shell with n = 6 , l = 2 can accommodate a maximum of

• 12 electrons
• 36 electrons
• 10 electrons
• 72 electrons

14. The frequency of a wave of light is 12 × 1014s-1. The wave number associated with this light

• 5 × 10-7m
• 4 × 10-8cm-1
• 2 × 10-7m-1
• 4 × 104cm-1

15. According to Aufbaus principle, which of the three 4d, 5p and 5s will be filled with electrons first

• 4d
• 5p
• 5s
• 4d and 5s will be filled simultaneously