Atomic and Molecular Masses NEET Questions

Physical Chemistry - Some Basic Concepts of Chemistry

Atomic and Molecular Masses MCQ Questions


1.
What is the atomic mass unit (amu) defined as?
A.
1/16th of oxygen-16
B.
1/12th of carbon-12
C.
1/14th of nitrogen-14
D.
1/10th of neon-20
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ANSWER :
B. 1/12th of carbon-12
2.
Which of the following statements about molecular mass is correct?
A.
It is always the sum of atomic masses of atoms present in a molecule
B.
It is the weighted average of atomic masses of elements
C.
It is always greater than the atomic mass of the heaviest element
D.
It depends on the molecular formula
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ANSWER :
D. It depends on the molecular formula
3.
The molecular mass of water (Hâ‚‚O) is approximately:
A.
16 amu
B.
18 amu
C.
20 amu
D.
14 amu
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ANSWER :
B. 18 amu
4.
If the molecular mass of COâ‚‚ is 44 amu, what is its molar mass in grams per mole?
A.
22 g/mol
B.
44 g/mol
C.
88 g/mol
D.
11 g/mol
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ANSWER :
B. 44 g/mol
5.
Which element has an atomic mass closest to an integer value?
A.
Carbon
B.
Hydrogen
C.
Oxygen
D.
Neon
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ANSWER :
A. Carbon
6.
The atomic mass of chlorine is 35.5 u because:
A.
It has only one isotope
B.
It exists as isotopes of Cl-35 and Cl-37
C.
It is found in equal proportions
D.
It has an atomic number of 17
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ANSWER :
B. It exists as isotopes of Cl-35 and Cl-37