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JEE Main Chemistry Class 11 Structure of Atom Part 2 Questions
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© examsnet.com
Question : 40
Total: 91
According to Bohr's atomic theory,
I. kinetic energy of electron is
∝
Z
2
n
2
II. the product of velocity
(
v
)
of electron and principal quantum number
(
n
)
,
′
v
n
′
∝
Z
2
.
III. frequency of revolution of electron in an orbit is
∝
Z
3
n
3
IV. coulombic force of attraction on the electron is
∝
Z
3
n
4
Choose the most appropriate answer from the options given below.
[24 Feb 2021 Shift 2]
Only III
Only I
I, III and IV
I and IV
Validate
Solution:
According to Bohr's theory,
I.
K
E
∝
Z
2
n
2
or
13.6
∝
Z
2
n
2
(
e
V
)
(
atom
)
( ∴ Correct)
II. Speed of electron
∝
Z
n
(Here, Z = atomic number,
n
=
number of shells)
∴
v
×
n
∝
Z
(
∴
Incorrect)
III. Frequency of revolution of electron
=
v
2
π
r
Frequency
∝
Z
2
n
3
(
∵
v
∝
z
n
,
r
∝
n
2
z
)
( ∴ Incorrect)
IV.
F
=
k
q
1
q
2
r
2
=
k
Z
e
2
r
2
F
=
Z
(
n
2
Z
)
2
F
∝
Z
3
n
4
( ∴ Correct)
Hence, only I, and IV are correct.
© examsnet.com
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