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