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.
Bohr's quantization condition for angular momentum is:
A.
mvr = h/2π
B.
mvr = nh/2π
C.
mvr = nh²
D.
mvr = nh
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ANSWER :
B. mvr = nh/2π
8.
The radius of nth Bohr orbit of hydrogen atom is given by:
A.
r_n = a₀/n²
B.
r_n = n × a₀²
C.
r_n = n × a₀
D.
r_n = n² × a₀
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ANSWER :
D. r_n = n² × a₀
9.
The Bohr radius (a₀) is approximately:
A.
0.529 nm
B.
52.9 pm (or 0.529 Å)
C.
5.29 nm
D.
529 pm
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ANSWER :
B. 52.9 pm (or 0.529 Å)
10.
In Bohr's model, the radius of second orbit of hydrogen atom is:
A.
52.9 pm
B.
476.1 pm
C.
211.6 pm
D.
105.8 pm
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ANSWER :
C. 211.6 pm
11.
The energy of electron in nth orbit of hydrogen atom is given by:
A.
E_n = RH/n²
B.
E_n = RH/n
C.
E_n = -RH × n²
D.
E_n = -RH/n²
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ANSWER :
D. E_n = -RH/n²
12.
The Rydberg constant RH in energy units is:
A.
2.18 × 10⁻¹⁷ J
B.
2.18 × 10⁻¹⁹ J
C.
2.18 × 10⁻¹⁸ J
D.
2.18 × 10⁻²⁰ J
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ANSWER :
C. 2.18 × 10⁻¹⁸ J