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Byju's Answer
Standard XII
Chemistry
Bohr's Model of a Hydrogen Atom
Ratio of radi...
Question
Ratio of radii of second and first orbits of
H
atom is:
A
2
:
1
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B
4
:
1
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C
3
:
1
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D
5
:
1
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Solution
The correct option is
B
4
:
1
Bohr's radius for
n
t
h
orbit,
(
r
n
)
=
0.529
[
n
2
Z
]
∘
A
where
n
=
Orbit number
,
Z
=
Atomic number
Since,
r
∝
n
2
∴
r
2
r
1
=
2
2
1
2
=
4
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Standard XII Chemistry
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