| Chapter-2: Structure of Atom |
1. The credit of discovering neutron goes to
- Rutherford
- Thomson
- Goldstein
- Chadwick
[su_spoiler title=”Answer ” style=”fancy”] Chadwick [/su_spoiler]
2. For principal quantum number n = 4, the total number of orbitals having l = 3 is
- 3
- 7
- 5
- 9
[su_spoiler title=”Answer ” style=”fancy”] 7 [/su_spoiler]
3. The maximum number of electrons that can be accommodated in fifth energy level is
- 10
- 25
- 50
- 32
[su_spoiler title=”Answer ” style=”fancy”] 50 [/su_spoiler]
4. The electronic transitions from n = 2 to n = 1 will produce shortest wavelength in (where n = principal quantum state)
- Li2+
- He+
- H
- H+
[su_spoiler title=”Answer ” style=”fancy”] Li2+ [/su_spoiler]
5. The magnetic quantum number specifies
- Size of orbitals
- Shape of orbitals
- Orientation of orbitals
- Nuclear Stability
[su_spoiler title=”Answer ” style=”fancy”] Orientation of orbitals [/su_spoiler]
6. Maximum number of electrons in a subshell with l = 3 and n = 4 is
- 10
- 12
- 14
- 16
[su_spoiler title=”Answer ” style=”fancy”] 14 [/su_spoiler]
7. The charge to mass ratio of α – particles is approximately …… the charge to mass ratio of protons
- Twice
- Half
- Four times
- Six times
[su_spoiler title=”Answer ” style=”fancy”] Half [/su_spoiler]
8. In chromium atom, in ground state, the number of occupied orbitals is
- 14
- 15
- 7
- 12
[su_spoiler title=”Answer ” style=”fancy”] 15 [/su_spoiler]
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+
[su_spoiler title=”Answer ” style=”fancy”] n = 2, Be3+ [/su_spoiler]
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
[su_spoiler title=”Answer ” style=”fancy”] Cu+2, Ti+3 [/su_spoiler]
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
[su_spoiler title=”Answer ” style=”fancy”] n = 3, l = 2, m = 1, s = +1/2 [/su_spoiler]
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
[su_spoiler title=”Answer ” style=”fancy”] 1.51 eV [/su_spoiler]
13. A sub-shell with n = 6 , l = 2 can accommodate a maximum of
- 12 electrons
- 36 electrons
- 10 electrons
- 72 electrons
[su_spoiler title=”Answer ” style=”fancy”] 10 electrons [/su_spoiler]
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
[su_spoiler title=”Answer ” style=”fancy”] 4 × 104cm-1 [/su_spoiler]
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
[su_spoiler title=”Answer ” style=”fancy”] 5s [/su_spoiler]