1. Number of p orbitals of electrons in Cl ̅. ion?
A) 6
B) 5
C) 11
D) 12
Ans: D
2. Who introduced elliptical orbits?
A) Bohr
B) Sommerfeld
C) Scrowdinger
D) Zeeman
Ans: B
3. The valency electronic configuration of sodium .......
A) [Ne]3s1
B) 1s2 2s2 2p6 3s1
C) 3s1
D) 3s1 3p2
Ans: A
4. The maximum number of electrons in M - shell is .....
A) 2
B) 12
C) 32
D) 18
Ans: D
5. The value of Planck constant is
A) 6.626 × 10-34 J.S.
B) 6.626 × 10-34 erg.S
C) 6.626 × 10-34 cm
D) 6.626 × 10-34 m
Ans: A
6. Which of the following has shorter wavelength of rays?
A) X-rays
B) Gamma rays
C) UV rays
D) IR Rays
Ans: B
7. The number of degenerated orbitals in d-sub shell .........
A) 2
B) 3
C) 7
D) 5
Ans: D
8. Which law states that no two electrons of the same atom can have all four quantum numbers the same?
A) Pauli Exclusion Principle
B) Hund rule
C) Aufbau rule
D) (n + l) rule
Ans: A
9. The maximum number of electrons in p-orbital .........
A) 2
B) 4
C) 6
D) 10
Ans: C
10. Which of the following is a correct energy of orbitals?
A) 3s < 3d < 5p < 6s
B) 3s < 4s < 3p < 3d
C) 3p < 3s < 4s < 3d
D) 3s < 3p < 4s < 3d
Ans: D
11. Which of the following is not true?
A) Orbital is the space around the nucleus where the probability of finding the electron is maximum.
B) Quantum numbers represent probability of finding electron.
C) l = 2 represents 'p' orbital
D) None of these
Ans: C
12. Match the following:
| Group-I | Group-II |
| 1. Nitrogen 2. Magnesium 3. Potassium 4. Fluorine |
P) [Ar] 4s1 Q) [He] 2s2 2p5 R) [He] 2s2 2p3 S) [Ne] 3s2 |
A) 1-R, 2-P, 3-S, 4-Q
B) 1-R, 2-S, 3-P, 4-Q
C) 1-R, 2-S, 3-Q, 4-P
D) 1-R, 2-Q, 3-P, 4-S
Ans: B
13. Which of the following Quantum numbers is not possible?
A) n = 2, l = 1, m = +1, ms = -1/2
B) n = 2, l = 2, m = +1, ms = +1/2
C) n = 3, l = 2, m = +2, ms = -1/2
D) n = 3, l = 2, m = -2, ms = -1/2
Ans: D
14. In the Aufbau principle, the term "Aufbau" refers to ...........
A) Scientist name
B) Place
C) Building up
D) Discovery
Ans: B
