Bohr Model of a Hydrogen Atom (its Postulates, Derivation of the Relations for the Energy...) NEET Questions

Physical Chemistry - Atomic Structure

Bohr Model of a Hydrogen Atom (its Postulates, Derivation of the Relations for the Energy...) MCQ Questions


7.
The radius of the first Bohr orbit is approximately:
A.
0.529 Å
B.
1.0 Å
C.
2.0 Å
D.
0.1 Å
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ANSWER :
A. 0.529 Å
8.
Which force is responsible for the stability of an electron in an orbit?
A.
Gravitational force
B.
Magnetic force
C.
Coulomb force
D.
Nuclear force
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ANSWER :
C. Coulomb force
9.
What happens when an electron moves to a higher energy level?
A.
It emits energy
B.
It absorbs energy
C.
It loses mass
D.
It gains charge
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ANSWER :
B. It absorbs energy
10.
Which quantum number is defined by Bohr’s model?
A.
Azimuthal
B.
Principal
C.
Magnetic
D.
Spin
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ANSWER :
B. Principal
11.
Bohr’s model explains the spectrum of which element best?
A.
Helium
B.
Hydrogen
C.
Lithium
D.
Boron
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ANSWER :
B. Hydrogen
12.
The velocity of an electron in the nth orbit is proportional to:
A.
1/n²
B.
1/n
C.
n
D.
n²
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ANSWER :
B. 1/n