Atomic and Molecular Masses NEET Questions

Physical Chemistry - Some Basic Concepts of Chemistry

Atomic and Molecular Masses MCQ Questions


13.
Who first arbitrarily assigned a relative atomic mass of 1 to hydrogen?
A.
Joseph Proust
B.
John Dalton
C.
Amedeo Avogadro
D.
Stanislao Cannizzaro
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ANSWER :
B. John Dalton
14.
Modern accurate determination of atomic masses uses:
A.
Volumetric titration
B.
Mass spectrometry
C.
Gravimetric analysis
D.
Density measurement
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ANSWER :
B. Mass spectrometry
15.
Molecular mass is calculated by:
A.
Multiplying atomic masses of each element by the number of atoms and adding
B.
Adding atomic numbers of all atoms
C.
Dividing total mass by number of atoms
D.
Multiplying atomic masses by valencies and summing
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ANSWER :
A. Multiplying atomic masses of each element by the number of atoms and adding
16.
The molecular mass of methane (CH₄) using atomic masses C = 12, H = 1 is:
A.
16
B.
17
C.
20
D.
13
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ANSWER :
A. 16
17.
The molecular mass of glucose (C₆H₁₂O₆) is:
A.
150 u
B.
180 u
C.
342 u
D.
210 u
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ANSWER :
B. 180 u
18.
The molecular mass of sulfuric acid (H₂SO₄) is: (Atomic masses: H=1, S=32, O=16)
A.
98
B.
96
C.
82
D.
100
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ANSWER :
A. 98