Atoms, Molecules, and Nuclear Chemistry CDS Questions

CDS Chemistry

Atoms, Molecules, and Nuclear Chemistry MCQ Questions


13.
J.J. Thomson's model of the atom, in which negatively charged electrons are embedded in a sphere of positive charge, is popularly called the:
A.
Nuclear model
B.
Solar system model
C.
Plum pudding model
D.
Quantum mechanical model
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ANSWER :
C. Plum pudding model
14.
The principle describing the order in which electrons fill atomic orbitals, starting from the orbital of lowest energy, is known as the:
A.
Hund's rule
B.
Bohr's postulate
C.
Pauli's exclusion principle
D.
Aufbau principle
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ANSWER :
D. Aufbau principle
15.
According to Heisenberg's uncertainty principle, it is impossible to determine simultaneously and with absolute accuracy the:
A.
Position and momentum of an electron
B.
Charge and mass of an electron
C.
Energy and charge of a proton
D.
Mass and volume of an atom
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ANSWER :
A. Position and momentum of an electron
16.
In a neutral atom, the number of electrons is always equal to its:
A.
Average atomic mass
B.
Atomic number
C.
Number of neutrons
D.
Mass number
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ANSWER :
B. Atomic number
17.
Which quantum number determines the shape of an electron's orbital?
A.
Principal quantum number
B.
Spin quantum number
C.
Magnetic quantum number
D.
Azimuthal (angular momentum) quantum number
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ANSWER :
D. Azimuthal (angular momentum) quantum number
18.
The electrons present in the outermost shell of an atom, which largely determine its chemical behaviour, are called:
A.
Core electrons
B.
Paired electrons
C.
Valence electrons
D.
Free electrons
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ANSWER :
C. Valence electrons