Qualitative and Quantitative Analysis (Estimation of Carbon, Hydrogen, Nitrogen,... ) NEET Questions

Organic Chemistry - Purification and Characterization of Organic Compounds

Qualitative and Quantitative Analysis (Estimation of Carbon, Hydrogen, Nitrogen,... ) MCQ Questions


1.
The organic compound is fused with sodium metal for
A.
Detection of elements
B.
Separation of compounds
C.
Preparation of salts
D.
Precipitation of impurities
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ANSWER :
A. Detection of elements
2.
Lassaigne's test is used to detect
A.
C, H, and O
B.
Metals
C.
Non-metals
D.
N, S, and halogens
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ANSWER :
D. N, S, and halogens
3.
In Lassaigne's test, nitrogen is converted into
A.
NaCN
B.
NaNO₃
C.
NaNHâ‚‚
D.
NaNOâ‚‚
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ANSWER :
A. NaCN
4.
Kjeldahl’s method is not applicable to

NEET - 2018

A.
Aniline
B.
Azobenzene
C.
Urea
D.
Amines
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ANSWER :
B. Azobenzene
5.
The blue color in Lassaigne’s test with ferrous sulphate and ferric chloride indicates presence of
A.
Halogens
B.
Nitrogen
C.
Sulphur
D.
Phosphorus
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ANSWER :
B. Nitrogen
6.
Lassaigne's extract is boiled with HNO₃ before testing for halogens to
A.
Destroy NaCN and Naâ‚‚S
B.
Enhance reaction
C.
Oxidize halides
D.
Form white precipitate
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ANSWER :
A. Destroy NaCN and Naâ‚‚S