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


7.
A compound has 92.3% C and 7.7% H. Molecular mass is 78 g/mol. Molecular formula is

NEET - 2020

A.
C₆H₆
B.
C₄H₆
C.
C₃H₈
D.
C₂H₆
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ANSWER :
A. C₆H₆
8.
Which of the following has empirical formula same as its molecular formula?
A.
Glucose
B.
Acetic acid
C.
Methane
D.
Ethanol
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ANSWER :
C. Methane
9.
Which information is not required to determine empirical formula?
A.
% composition
B.
Atomic mass
C.
Formula mass
D.
Molecular mass
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ANSWER :
C. Formula mass
10.
Empirical formula of benzene is
A.
CH
B.
C₂H₂
C.
C₆H₆
D.
C₄H₄
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ANSWER :
A. CH
11.
Empirical formula is obtained using
A.
% by mass
B.
Molar mass
C.
Avogadro’s number
D.
Mole ratio
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ANSWER :
A. % by mass
12.
A compound has 40% C, 6.7% H and 53.3% O. Empirical formula mass is
A.
30
B.
60
C.
90
D.
120
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ANSWER :
A. 30