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.
Lassaigne's test is used for the detection of which of the following elements in an organic compound?
A.
Nitrogen, sulphur, halogens and phosphorus
B.
Only halogens
C.
Only nitrogen
D.
Only carbon and hydrogen
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ANSWER :
A. Nitrogen, sulphur, halogens and phosphorus
2.
Why is an organic compound fused with sodium metal in Lassaigne's test?
A.
To oxidize the elements
B.
To convert covalently bonded elements (N, S, X, P) into their ionic (sodium salt) forms
C.
To remove carbon and hydrogen
D.
To make the compound water-soluble only
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ANSWER :
B. To convert covalently bonded elements (N, S, X, P) into their ionic (sodium salt) forms
3.
The sodium fusion extract is prepared by:
A.
Burning the organic compound in air
B.
Boiling the fused mass with distilled water
C.
Dissolving the compound directly in water
D.
Boiling the fused mass with concentrated HCl
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ANSWER :
B. Boiling the fused mass with distilled water
4.
When organic compound containing nitrogen is fused with sodium, the species formed is:
A.
NaNO₃
B.
NaNHâ‚‚
C.
NaCN
D.
NaN₃
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ANSWER :
C. NaCN
5.
Sulphur in an organic compound, on fusion with sodium, is converted to:
A.
Naâ‚‚S
B.
Naâ‚‚SOâ‚„
C.
NaHS
D.
Na₂SO₃
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ANSWER :
A. Naâ‚‚S
6.
Halogens in an organic compound, on Lassaigne's fusion, are converted to:
A.
NaXO
B.
NaXO₃
C.
HX
D.
NaX (X = Cl, Br, I)
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ANSWER :
D. NaX (X = Cl, Br, I)