Qualitative Analysis (Detection of Nitrogen, Sulphur, Phosphorus, and Halogens ) NEET Questions

Organic Chemistry - Purification and Characterization of Organic Compounds

Qualitative Analysis (Detection of Nitrogen, Sulphur, Phosphorus, and Halogens ) MCQ Questions


1.
In Lassaigne’s test, nitrogen is detected by formation of
A.
Sodium nitrite
B.
Prussian blue
C.
Sodium nitrate
D.
Ferric chloride
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ANSWER :
B. Prussian blue
2.
The Lassaigne’s extract is prepared by fusing the organic compound with
A.
NaOH
B.
KOH
C.
Sodium metal
D.
Potassium metal
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ANSWER :
C. Sodium metal
3.
Sulphur is detected in Lassaigne’s test by formation of
A.
Lead acetate
B.
Ferric sulphide
C.
Black precipitate of PbS
D.
White ppt
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ANSWER :
C. Black precipitate of PbS
4.
Nitrogen and sulphur both can be detected by formation of
A.
Black ppt
B.
Red ppt
C.
Green colour
D.
Blood red colour
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ANSWER :
D. Blood red colour
5.
Which of the following is used to detect halogens in Lassaigne’s extract?

NEET - 2017

A.
AgNO₃
B.
BaCl₂
C.
FeCl₃
D.
NaOH
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ANSWER :
A. AgNO₃
6.
The test for nitrogen in Lassaigne’s extract is confirmed by
A.
Green ppt
B.
Blue colour
C.
Prussian blue colour
D.
Black ppt
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ANSWER :
C. Prussian blue colour