Home
E-Books
Jobs
News
Results
Competition Exams
Admissions
Generate Test
Make Quiz
mcqs of
,
1 : What is the relative atomic mass of nitrogen (¹⁴N: 99.64%, ¹⁵N: 0.35%)?
A
:
14.0210
B
:
14.0021
C
:
14.2100
D
:
14.1200
2 : Why have isotopes not been shown in the periodic table?
A
:
Periodic table cannot accommodate isotopes
B
:
Isotopes are unstable
C
:
All isotopes have the same atomic number
D
:
Isotopes do not show periodic behavior
3 : In which isotope of oxygen are protons, electrons, and neutrons equal?
A
:
¹⁷O
B
:
¹⁶O
C
:
¹⁸O
D
:
None of these
4 : How do electrons avoid the nucleus?
A
:
Revolving around the nucleus
B
:
Stationary
C
:
Wave-like nature
5 : What keeps nuclear particles intact?
A
:
Strong nuclear force
B
:
Electrostatic force
C
:
Weak nuclear force
6 : What information was obtained from the discharge tube experiment?
A
:
Structure of atom was discovered
B
:
Neutrons and protons were discovered
C
:
Electrons and protons were discovered
D
:
Presence of nucleus in an atom was discovered
7 : Which particle is present in different numbers in isotopes?
A
:
Electron
B
:
Neutron
C
:
Proton
D
:
Both neutron and electron
8 : How many electrons can be accommodated at the most in the third shell of the element?
A
:
8
B
:
18
C
:
10
D
:
32
9 : How is radiocarbon dating useful for archaeologists?
A
:
Determines age of organic matter
B
:
Determines composition of matter
C
:
Checks radioactivity
10 : Abundance of ⁸⁷Rb (atomic mass = 85.47, ⁸⁵Rb = 72.2%)?
A
:
15%
B
:
27.8%
C
:
37%
D
:
72%
11 : What is the atomic number of an element?
A
:
Number of proton
B
:
Number of electron
C
:
Number of neutron
D
:
Number of positive
12 : Which model of the atom first introduced the concept of electron orbits?
A
:
Dalton ,s model
B
:
Rutherford’s model
C
:
Bohr’s model
D
:
Quantum mechanical model
13 : Who discovered the electron?
A
:
Thomson
B
:
Earnest
C
:
James
D
:
John
14 : In which shell does the f sub – shell first appear?
A
:
First shell
B
:
Second shell
C
:
Third shell
D
:
Forth shell
15 : Which of the following defines isotopes.
A
:
Atom with the same a atomic number but different mass number
B
:
Atomic with the same number but different atomic number
C
:
Atomic with the same number of neutron but different proton
16 : Deuterium is used to make:
A
:
Light water
B
:
Heavy water
C
:
Soft water
D
:
Hard water
17 : What is relative atomic mass of an element?
A
:
Total number of neutron in an atom
B
:
The number of proton
C
:
The total mass of electron and neautron
D
:
The weight average mass isotopes relative 1/12 of a carbon
18 : Who discovered the nucleus at atom?
A
:
Thomson
B
:
Ernest Rutherford
C
:
Niles Bohr
D
:
John Dalton
19 : What is the maximum number of electron that can be accommodated in the third shell?
A
:
2
B
:
10
C
:
18
D
:
32
20 : Which experiment led to the discovery of the proton?
A
:
Millikan ‘s Oil Drop Experiment
B
:
Gold foil experiment
C
:
Canal Ray experiment
D
:
Cathode Ray experiment
21 : Who is created to the discovery of the proton of the neutron?
A
:
J.J Thomas
B
:
Niles boar
C
:
James Chadwick
D
:
Earnest Rutherford
22 : What happens during isotopes is commonly used for determining the age of fossils
A
:
The number of neautron increase
B
:
The isotope absorb energy
C
:
The isotope emits radiation
D
:
The number of proton remains constant
23 : What is the primary application of radioactive isotope in medicine:
A
:
Producing electricity
B
:
Carbon dating
C
:
Tracing imaging inside the body
D
:
Determining dating
24 : Which radioactive is used in radiotherapy for cancer treatment?
A
:
Strontium-90
B
:
Technetium-99
C
:
Cobbalt-60
D
:
Plutonium-239
25 : What was the primary conclusion of the cathode ray experiment?
A
:
Discovery of proton
B
:
Discovery of neutron
C
:
Discovery of electron
D
:
Structural of the nacelles
26 : What is the maximum of electron that the of sub- shell can hold?
A
:
10
B
:
18
C
:
6
D
:
8
27 : How many orbits are three in the p sub – shell?
A
:
1
B
:
3
C
:
5
D
:
7
28 : The isotope of uranium used in clear reactions is:
A
:
Uranium -235
B
:
Uranium-238
C
:
Uranium-234
D
:
Uranium-240
29 : The isotope C- 12 is present in abundance of:
A
:
96.9 peerage
B
:
98.9per
C
:
99.7 per
D
:
None of those
30 : The relative atomic mass of chlorine is approximately 35.5 why is not a whole number?
A
:
Chlorine has more protons than electron
B
:
Chlorine has two isotopes
C
:
Chlorine contains an equal number and neautron
D
:
Chlorine has a small atomic size
31 : Carbon -12 and Carbon -14 are examples of isotopes because:
A
:
They have the same number of neutron
B
:
They have different of electron
C
:
They have same number but different neutron
D
:
They have different atomic number
32 : Which property is identical for nuclear reactors is:
A
:
Number of neutron
B
:
Mass number
C
:
Atomic number
D
:
Atomic number
33 : Isotope of the same element differ in:
A
:
Atomic mubner
B
:
Number of proton
C
:
Number of electron
D
:
Number of neautron
34 : Which of the following types of radiation is emitted during radioactive decay of isotopes?
A
:
Ultraviolet rays
B
:
Infant rays
C
:
Alpha, beta or gamma rays
D
:
X- rays
35 : Which radioactive isotope is used in medical treatments for thyroid discovers?
A
:
Carbon-14
B
:
Iodine -131
C
:
Uranium-235
D
:
Polonium -210
36 : Which of the following is not a property of radioactive isotope?
A
:
They emit radiation
B
:
They have unstable nuclei
C
:
They can transform into other elemental
D
:
They have always to safe hands
37 : The relative atomic mass of carbon is 12 what does this mean?
A
:
Carbon has 6 neautron in its uncles
B
:
Carbon has 6v protons in its nucleus
C
:
Carbon atom are 12 times than hydrogen atom
D
:
Carbon mass 12 rime the mass of a carbon
38 : If an element has two isotopes with masses 10 and 1 what is its relative atomic mass?
A
:
10.2
B
:
10.8
C
:
11.2
D
:
11.0
39 : Which subatomic particle has no electron charge?
A
:
Proton
B
:
Electron
C
:
Position
D
:
Neutron
40 : Radioactive isotopes are widely used in agriculture to:
A
:
Impress seed growth
B
:
Control pests and insects
C
:
Produced fritter
D
:
Prevent soil erosion
41 : Which unit is used for relative atom mass?
A
:
Kilogram
B
:
Gram
C
:
No unit
D
:
Mole
42 : Which of hat ewfollowin g sub- shell is present in the third shell (n=3)?
A
:
S only
B
:
S,p,d
C
:
A and p only
D
:
P only
43 : Which of the following isotopes is commonly used for determining the age fossils?
A
:
Carbon -14
B
:
Uranium-238
C
:
Odoine-131
D
:
Cobalt-60
44 : Which tradiacstive isotope is company used as a tracer in medical imaging?
A
:
Technetium-99
B
:
Carbon-12
C
:
Cobalt-60
D
:
Uranium-238
45 : What is the half of a radioactive isotope?
A
:
Time required for the isotope to completely decay
B
:
Time taken for the isotope to stop emitting radiation
C
:
Time required for half isotope to reach stability
D
:
Time required for the half radioactive atom to repay
Chemistry 9th MCQs || Ilam Ghar
Chemistry 9th
Chapter 2 : Atomic Structure
