Percentage Composition, Empirical and Molecular Formulae NEET Questions

Physical Chemistry - Some Basic Concepts of Chemistry

Percentage Composition, Empirical and Molecular Formulae MCQ Questions


1.
What is the percentage composition of oxygen in H₂O?
A.
88.80%
B.
33.30%
C.
16%
D.
89.90%
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ANSWER :
B. 33.30%
2.
If the empirical formula of a compound is CH₂O and its molecular mass is 180 g/mol, what is its molecular formula?
A.
C₆H₁₂O₆
B.
CH₄O
C.
CH₂O
D.
C₂H₂
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ANSWER :
A. C₆H₁₂O₆
3.
Which of the following statements is true about empirical and molecular formulas?
A.
Molecular formula is always simpler than empirical formula
B.
Empirical formula is a whole-number multiple of molecular formula
C.
Empirical and molecular formulas are always the same
D.
Molecular formula is always a multiple of the empirical formula
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ANSWER :
D. Molecular formula is always a multiple of the empirical formula
4.
A compound contains 40% carbon, 6.7% hydrogen, and 53.3% oxygen. What is its empirical formula?
A.
CH₂O
B.
C₂H₄O₂
C.
C₃H₆O₃
D.
CH₄O
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ANSWER :
A. CH₂O
5.
Which of the following is an example of a compound with the same empirical and molecular formula?
A.
CO₂
B.
H₂O
C.
NH₃
D.
NaCl
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ANSWER :
D. NaCl
6.
The empirical formula of benzene (C₆H₆) is:
A.
C₃H₃
B.
C₂H₂
C.
C₆H₆
D.
C₃H₆
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ANSWER :
B. C₂H₂