Atomic and Molecular Masses NEET Questions

Physical Chemistry - Some Basic Concepts of Chemistry

Atomic and Molecular Masses MCQ Questions


1.
The atomic mass of an element represents:
A.
The mass of one atom relative to 1/12th the mass of a carbon-12 atom
B.
The mass of one molecule of the element
C.
The mass in grams of one atom
D.
The number of protons plus neutrons in the nucleus
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ANSWER :
A. The mass of one atom relative to 1/12th the mass of a carbon-12 atom
2.
The current standard for atomic masses is based on:
A.
Hydrogen-1 atom
B.
Carbon-12 atom
C.
Oxygen-16 atom
D.
Helium-4 atom
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ANSWER :
B. Carbon-12 atom
3.
One atomic mass unit (1 u) is defined as:
A.
Mass of one hydrogen atom
B.
1/12th the mass of one carbon-12 atom
C.
Mass of one proton
D.
1/16th the mass of one oxygen-16 atom
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ANSWER :
B. 1/12th the mass of one carbon-12 atom
4.
The value of 1 atomic mass unit (1 u) in grams is:
A.
1.66 × 10⁻²⁴ g
B.
1.0 × 10⁻²⁴ g
C.
6.022 × 10⁻²³ g
D.
1.66 × 10⁻²³ g
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ANSWER :
A. 1.66 × 10⁻²⁴ g
5.
Why was carbon-12 chosen as the reference for atomic masses?
A.
It is abundant, stable, and easy to handle in mass spectrometry
B.
It has the highest mass
C.
It is a noble gas
D.
It is the lightest element
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ANSWER :
A. It is abundant, stable, and easy to handle in mass spectrometry
6.
In the SI system, the symbol for unified atomic mass unit is:
A.
u
B.
amu
C.
Da
D.
g
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ANSWER :
A. u