Structure of Atoms NDA Questions

NDA Chemistry

Structure of Atoms MCQ Questions


13.
The principal quantum number of an electron in an atom determines the__________
A.
Energy level
B.
Shape of the orbital
C.
Magnetic properties of the atom
D.
Spin of the electron
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ANSWER :
A. Energy level
14.
Which of the following is true for the wave nature of electron?
A.
Electrons travel in straight lines
B.
Electrons have both wave-like and particle-like properties
C.
Electrons do not show diffraction
D.
Electrons are purely particles
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ANSWER :
B. Electrons have both wave-like and particle-like properties
15.
The first ionization energy of an element is the energy required to__________
A.
Remove an electron from a gaseous atom
B.
Remove a proton from an atom
C.
Remove an electron from a molecule
D.
Remove a neutron from an atom
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ANSWER :
A. Remove an electron from a gaseous atom
16.
The number of possible values of the magnetic quantum number (mâ‚—) for a p-orbital is__________
A.
1
B.
2
C.
3
D.
4
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ANSWER :
C. 3
17.
According to Bohr's theory, the energy levels are quantized. This means that__________
A.
Energy is inversely proportional to distance
B.
The energy in all orbits is the same
C.
Energy can be any value
D.
The energy of each orbit is fixed
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ANSWER :
D. The energy of each orbit is fixed
18.
The orbital angular momentum of an electron is quantized, which was shown by__________
A.
Bohr
B.
de Broglie
C.
Heisenberg
D.
Schrodinger
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ANSWER :
A. Bohr