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


7.
The Prussian blue colour indicates presence of
A.
Nitrogen
B.
Sulphur
C.
Halogens
D.
Phosphorus
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ANSWER :
A. Nitrogen
8.
Which compound confirms presence of sulphur in Lassaigne’s extract?
A.
White ppt of AgCl
B.
Black ppt of PbS
C.
Yellow ppt of AgBr
D.
Blood red complex
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ANSWER :
B. Black ppt of PbS
9.
For halogen detection, the extract is acidified with
A.
HCl
B.
H₂SO₄
C.
HNO₃
D.
NaOH
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ANSWER :
C. HNO₃
10.
Why is nitric acid used before adding silver nitrate in halogen test?
A.
To neutralize base
B.
To remove interfering ions
C.
To oxidize halogens
D.
To reduce halides
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ANSWER :
B. To remove interfering ions
11.
Phosphorus is detected by fusing the compound with
A.
Sodium
B.
Ammonium molybdate
C.
Sodium peroxide
D.
Sodium sulphate
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ANSWER :
C. Sodium peroxide
12.
In phosphorus detection, yellow ppt indicates presence of
A.
Phosphate
B.
Sulphate
C.
Nitrate
D.
Halide
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ANSWER :
A. Phosphate