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


13.
Which of the following represents an atom with 1 proton, 1 neutron, and 1 electron?
A.
Carbon atom
B.
Oxygen atom
C.
Nitrogen atom
D.
Hydrogen isotope (Deuterium)
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ANSWER :
D. Hydrogen isotope (Deuterium)
14.
The molecular weight of a molecule is defined as the sum of__________
A.
Valency of the atoms
B.
Atomic number of atoms
C.
Number of protons and neutrons
D.
Atomic weights of atoms in the molecule
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ANSWER :
D. Atomic weights of atoms in the molecule
15.
Which of the following is true about isotopes?
A.
Atoms of the same element with different mass numbers
B.
Atoms of the same element with the same number of protons but different number of neutrons
C.
Atoms of different elements with the same number of neutrons
D.
Atoms of the same element with different numbers of protons
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ANSWER :
B. Atoms of the same element with the same number of protons but different number of neutrons
16.
What is the valency of oxygen in water (Hâ‚‚O)?
A.
1
B.
2
C.
3
D.
0
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ANSWER :
B. 2
17.
The atomic mass unit (amu) is based on the mass of__________
A.
Carbon-12
B.
Hydrogen-1
C.
Oxygen-16
D.
Nitrogen-14
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ANSWER :
A. Carbon-12
18.
The atomic weight of an element is the__________
A.
Weighted average of all its isotopes
B.
Total number of protons
C.
Total number of electrons
D.
Average number of neutrons
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ANSWER :
A. Weighted average of all its isotopes