NEET 2022 · ChemistryPrevious Year Question
The Kjeldahl's method for the estimation of nitrogen can be used to estimate the amount of nitrogen in which one of the following compounds?
Answer: (C) Aniline (). \textbf{Answer:} (c) Aniline \textbf{Solution:} Kjeldahl's method works only when the nitrogen is quantitatively converted to ammonium sulphate on digestion with conc.
- A.Nitrobenzene ()
- B.Pyridine (nitrogen in the aromatic ring)
- C.Aniline ()✓
- D.Azobenzene ()
Correct Answer
(C) Aniline ()
Solution & Explanation
\textbf{Answer:} (c) Aniline \textbf{Solution:} Kjeldahl's method works only when the nitrogen is quantitatively converted to ammonium sulphate on digestion with conc. . It fails for nitrogen present as (nitrobenzene), in azo groups (azobenzene), or in a ring (pyridine), because such nitrogen is not converted to ammonium sulphate. Aniline is converted to ammonium sulphate, so only aniline can be estimated by this method.
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