Elementary Ideas About The Structure of Atom, Atomic Equivalent and Molecular Weights, Valency NDA Questions

NDA Chemistry

Elementary Ideas About The Structure of Atom, Atomic Equivalent and Molecular Weights, Valency MCQ Questions


7.
Which subatomic particle is responsible for the chemical properties of an atom?
A.
Electron
B.
Proton
C.
Neutron
D.
Photon
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ANSWER :
A. Electron
8.
The atomic number of an element determines its__________
A.
Position in the periodic table
B.
Mass number
C.
Electrons in the outer shell
D.
Chemical reactivity
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ANSWER :
A. Position in the periodic table
9.
The number of neutrons in an atom is calculated by__________
A.
Mass number – Atomic number
B.
Atomic number – Number of protons
C.
Mass number + Atomic number
D.
Number of electrons
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ANSWER :
A. Mass number – Atomic number
10.
The valency of an element is determined by__________
A.
Number of protons
B.
Number of neutrons
C.
Number of electrons in outermost shell
D.
Number of isotopes
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ANSWER :
C. Number of electrons in outermost shell
11.
The concept of the electron cloud was proposed by__________
A.
J.J. Thomson
B.
Niels Bohr
C.
Ernest Rutherford
D.
Schrodinger
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ANSWER :
D. Schrodinger
12.
The relative atomic mass is based on the comparison with the mass of__________
A.
Uranium-235 isotope
B.
Hydrogen-1 isotope
C.
Oxygen-16 isotope
D.
Carbon-12 isotope
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ANSWER :
D. Carbon-12 isotope