Halogens, Oxygen, Nitrogen, and Sulphur NEET Questions

Organic Chemistry - Some Basic Principles of Organic Chemistry

Halogens, Oxygen, Nitrogen, and Sulphur MCQ Questions


7.
During sodium fusion in Lassaigne's test, halogens present in the organic compound are converted into:
A.
Sodium perhalates
B.
Sodium halides (NaCl, NaBr, or NaI)
C.
Free halogen gases (Clâ‚‚, Brâ‚‚, or Iâ‚‚)
D.
Sodium hypohalites
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ANSWER :
B. Sodium halides (NaCl, NaBr, or NaI)
8.
After sodium fusion, the resulting fusion mixture is extracted with distilled water and filtered to obtain a clear filtrate, commonly known as the:
A.
Tollens' reagent
B.
Fehling's solution
C.
Sodium fusion extract (Lassaigne's extract)
D.
Nessler's solution
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ANSWER :
C. Sodium fusion extract (Lassaigne's extract)
9.
The sodium fusion extract obtained in Lassaigne's test is generally described as being:
A.
Acidic in nature
B.
Basic in nature
C.
Perfectly neutral, with a pH of exactly 7
D.
Highly explosive and unstable
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ANSWER :
B. Basic in nature
10.
In Lassaigne's test, the sodium fusion extract is tested for the presence of nitrogen by treating it with freshly prepared ferrous sulphate solution, followed by:
A.
Addition of ammonium hydroxide alone
B.
Boiling with distilled water alone
C.
Acidification with dilute sulphuric acid, after boiling and cooling the solution
D.
Direct addition of concentrated nitric acid without any other reagent
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ANSWER :
C. Acidification with dilute sulphuric acid, after boiling and cooling the solution
11.
In the nitrogen detection test, a positive result for the presence of nitrogen is indicated by the appearance of a characteristic:
A.
Prussian blue colouration (or precipitate)
B.
Blood red colouration
C.
Deep violet colouration
D.
Black precipitate
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ANSWER :
A. Prussian blue colouration (or precipitate)
12.
The Prussian blue colour formed in the nitrogen detection test arises due to the formation of which chemical compound?
A.
Ferric sulphide
B.
Ferrous cyanide alone
C.
Ferric thiocyanate
D.
Ferric ferrocyanide [Fe₄[Fe(CN)₆]₃]
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ANSWER :
D. Ferric ferrocyanide [Fe₄[Fe(CN)₆]₃]