Percentage Composition, Empirical and Molecular Formulae NEET Questions

Physical Chemistry - Some Basic Concepts of Chemistry

Percentage Composition, Empirical and Molecular Formulae MCQ Questions


7.
The mass percent of sulfur in H₂SO₄ is: (H=1, S=32, O=16)
A.
16.3%
B.
32.7%
C.
98.0%
D.
65.3%
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ANSWER :
B. 32.7%
8.
In magnesium oxide (MgO), the mass percent of oxygen is: (Mg=24, O=16)
A.
40%
B.
20%
C.
60%
D.
33.3%
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ANSWER :
A. 40%
9.
Calculate the percentage of nitrogen in urea (NH₂CONH₂): (N=14, C=12, O=16, H=1)
A.
23.3%
B.
46.7%
C.
33.3%
D.
60.0%
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ANSWER :
B. 46.7%
10.
The mass percent of carbon in methane (CH₄) is:
A.
50%
B.
25%
C.
100%
D.
75%
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ANSWER :
D. 75%
11.
In CaCO₃ (calcium carbonate), the mass percent of calcium is: (Ca=40, C=12, O=16)
A.
40.0%
B.
12.0%
C.
60.0%
D.
48.0%
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ANSWER :
A. 40.0%
12.
The percentage of phosphorus in calcium phosphate Ca₃(PO₄)₂ is: (Ca=40, P=31, O=16)
A.
10%
B.
40%
C.
20%
D.
30%
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ANSWER :
C. 20%