Structure of Atoms NDA Questions

NDA Chemistry

Structure of Atoms MCQ Questions


1.
The radius of the hydrogen atom according to Bohr’s model is__________
A.
0.53 × 10⁻¹⁰ m
B.
5.3 × 10⁻¹¹ m
C.
5.3 × 10⁻¹⁰ m
D.
53 × 10⁻¹² m
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ANSWER :
B. 5.3 × 10⁻¹¹ m
2.
The quantum number that determines the shape of an orbital is called__________
A.
Azimuthal quantum number
B.
Principal quantum number
C.
Magnetic quantum number
D.
Spin quantum number
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ANSWER :
A. Azimuthal quantum number
3.
Which of the following is not true about the Bohr model of the atom?
A.
The orbits are circular
B.
Electrons move in elliptical orbits
C.
The energy of electron is quantized
D.
It explains the hydrogen atom spectrum
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ANSWER :
B. Electrons move in elliptical orbits
4.
The uncertainty principle, which states that it is impossible to simultaneously know both position and momentum of an electron, was proposed by__________
A.
Werner Heisenberg
B.
Niels Bohr
C.
Albert Einstein
D.
Louis de Broglie
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ANSWER :
A. Werner Heisenberg
5.
Which of the following correctly represents the number of electrons in the second shell of an atom?
A.
4
B.
6
C.
8
D.
2n², where n = 2
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ANSWER :
C. 8
6.
According to the Pauli exclusion principle, the maximum number of electrons that can occupy a given orbital is__________
A.
2
B.
3
C.
4
D.
1
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ANSWER :
A. 2