Atomic Structure (F)
.
- 1.
For which species Bohr's theory does not apply?
- A.
H
- B.
He+
- C.
Li2+
- D.
Be
Correct Answer
D. Be -
- 2.
From discharge tube experiments it is concluded that:
- A.
Mass of a proton is in fraction
- B.
Matter contained electron
- C.
Nucleus contains positive charge
- D.
Positive rays are heavier than proton
Correct Answer
B. Matter contained electron -
- 3.
When an electron of charge 'e' and mass 'm' moves with velocity 'v' about the nuclear charge Ze in a circular orbit of radius 'r', the P.E. of electron is given by
- A.
Ze2/r
- B.
-Ze2/r
- C.
Ze2/r2
- D.
Mv2/r
Correct Answer
B. -Ze2/r -
- 4.
Which of the following does not tell about shells of an atom?
- A.
Principle quantum number , n
- B.
Azimuthal quantum number, l
- C.
Magnetic quantum number, m
- D.
Spin quantum number, s
Correct Answer
A. Principle quantum number , n -
- 5.
The electronic configuration of species M2+ is 1s2, 2s2, 2p6, 3s2, 3p6,3d6 and its atomic weight is 56 amu, the number of neutron in the nucleus of species M is
- A.
20
- B.
26
- C.
28
- D.
30
Correct Answer
D. 30 -
- 6.
The energy of an electromagnetic radiation 3 × 10-12 ergs. What is its wave length in nano meter
- A.
400
- B.
228.3
- C.
3000
- D.
662.5
Correct Answer
B. 228.3 -
- 7.
Which of the following configuration is not correct according to Hund's rule?
- A.
A
- B.
B
- C.
C
- D.
Option 4
Correct Answer
B. B -
- 8.
Which one of the following statement is not correct?
- A.
Rydberg's constant and wave number have same unit
- B.
Lyman series of hydrogen spectrum occurs in the ultraviolet region.
- C.
The angular movement of the electron in the ground state of hydrogen atom is equal to h/2𝝅
- D.
The radius of first Bohr orbit of hydrogen atom is 2.116 ×108 cm.
Correct Answer
D. The radius of first Bohr orbit of hydrogen atom is 2.116 ×108 cm. -
- 9.
Which one of the following is not isoelectronic pair?
- A.
Mg2+, Be2+
- B.
N3-, O2-
- C.
N3-, F-
- D.
F1-, Al3+
Correct Answer
A. Mg2+, Be2+ -
- 10.
The third line in Balmer sereis corresponds to an electronic transfer between which Bohr's orbit in hydrogen.
- A.
5 → 3
- B.
5 → 2
- C.
4 → 3
- D.
4 → 2
Correct Answer
B. 5 → 2 -
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Current Version
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Jun 15, 2021Quiz Edited by
ProProfs Editorial Team -
Jun 15, 2021Quiz Created by
Zafar Iqbal
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