Percentage Composition, Empirical and Molecular Formulae NEET Questions

Physical Chemistry - Some Basic Concepts of Chemistry

Percentage Composition, Empirical and Molecular Formulae MCQ Questions


13.
The percentage of carbon in C₂H₆ is approximately:
A.
20%
B.
40%
C.
60%
D.
80%
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ANSWER :
C. 60%
14.
Which compound has the simplest empirical formula?
A.
C₆H₆
B.
CH₄
C.
N₂O₄
D.
H₂O
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ANSWER :
B. CH₄
15.
If the empirical formula of a compound is NO₂ and its molecular weight is 92 g/mol, what is its molecular formula?
A.
NO₂
B.
N₂O₄
C.
NO
D.
NO₃
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ANSWER :
B. N₂O₄
16.
Which of the following is NOT an empirical formula?
A.
C₄H₁₀
B.
C₂H₆O
C.
C₂H₂O₄
D.
C₃H₆O₃
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ANSWER :
A. C₄H₁₀
17.
What is the percentage of hydrogen in methane (CH₄)?
A.
25%
B.
50%
C.
75%
D.
12.50%
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ANSWER :
C. 75%
18.
Which of the following compounds has a different empirical and molecular formula?
A.
H₂O
B.
C₆H₆
C.
NH₃
D.
CO₂
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ANSWER :
B. C₆H₆