Calculations of Empirical Formulae and Molecular Formulae NEET Questions

Organic Chemistry - Purification and Characterization of Organic Compounds

Calculations of Empirical Formulae and Molecular Formulae MCQ Questions


1.
A compound contains 40% C, 6.7% H and 53.3% O. What is its empirical formula?
A.
CH₂O
B.
C₂H₄O₂
C.
CH₃O
D.
C₂H₆O
😑 View Answer Rough Work Error
ANSWER :
A. CH₂O
2.
Which of the following is correct for a compound with empirical formula CH₂O and molecular mass 180 g/mol?
A.
C₆H₁₂O₆
B.
C₂H₄O₂
C.
CH₂O
D.
C₄H₈O₄
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ANSWER :
A. C₆H₁₂O₆
3.
A hydrocarbon contains 85.7% carbon and 14.3% hydrogen. The empirical formula is
A.
CH₄
B.
C₂H₆
C.
CH
D.
C₂H
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ANSWER :
A. CH₄
4.
An organic compound contains 54.5% C, 9.1% H and 36.4% O. Empirical formula is
A.
C₂H₄O
B.
C₃H₈O
C.
C₃H₆O
D.
C₄H₈O₂
😑 View Answer Rough Work Error
ANSWER :
A. C₂H₄O
5.
If empirical formula mass is 30 and molecular mass is 90, then molecular formula is
A.
C₂H₆
B.
C₃H₆O
C.
C₄H₈
D.
C₃H₆
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ANSWER :
A. C₂H₆
6.
A compound contains 70% Fe and 30% O. Empirical formula is
A.
FeO
B.
Fe₂O₃
C.
Fe₃O₄
D.
Fe₂O
😑 View Answer Rough Work Error
ANSWER :
B. Fe₂O₃