Chemistry class ix notes 9th class board pattern model paper
Chemistry Chap-2 Structure of Atoms Important questions, if you attempt these question you will get InshaAllah 100% marks.
Chap-2 Structure of Atoms
Objective
Part
Choose the right option.
10×1=10
A
|
B
|
C
|
D
|
||
1
|
Deuterium is used to make
|
Light water
|
Heavy water
|
Soft water
|
Hard water
|
2
|
Who discovered the proton
|
Goldstein
|
J. J. Thomson
|
Neil Bohr
|
Rutherford
|
3
|
Plum pudding model was put
forwarded by:
|
Thomson
|
Chadwick
|
Goldstein
|
Dalton
|
4
|
Rutherford bombarded a thin sheet
of gold with
|
α particles
|
β particles
|
ƴ particles
|
X rays
|
5
|
Canal rays travel in a straight
line in a direction_______ to cathode rays.
|
Opposite
|
Same
|
Parallel
|
None of these
|
6
|
The isotope C-12 is present in
abundance of:
|
96.9%
|
97.6%
|
99.7%
|
None of these
|
7
|
Rutherford used a thin sheet of
gold having thickness:
|
0.00004cm
|
0.004cm
|
0.0004cm
|
0.04cm
|
8
|
Which are the sub shells of M
shell?
|
s, p
|
s, p, d
|
s, p, d, f
|
s, d, f
|
9
|
Quantum means:
|
Fixed volume
|
Fixed energy
|
Fixed pressure
|
Fixed temperature
|
10
|
The electrons revolve around the:
|
Atom
|
Nucleus
|
Proton
|
None of these
|
Subjective
Answer the short
questions
10×2=20
1. What
is atomic number of phosphorus? Write down its electronic configuration.
2.
Write down the
differences between Rutherford Atomic theory and Bohr’s Atomic theory.
3.
What will be the
nature of charge on an atom when it loses an electron or when it gains an
electron?
4.
Give three properties of positive rays.
5.
What are the
defects of Rutherford’s Atomic model?
6.
What do you know
about “Plum Pudding” theory?
7.
Write down the
electronic configuration of Cl- ion.
8.
Give three
characteristics of cathode rays.
9.
Define
electronic configuration.
10. What
are shell and subshells?
Long
Question 5×1=5
1.
(a) Describe the
postulates of Bohr’s Model of an atom. 3
(b) Describe the major
applications of isotopes in our surroundings. 2
Available all
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