Which of the following compounds is strictly UNSUITABLE for the estimation of nitrogen using Kjeldahl's method because its nitrogen cannot be quantitatively converted to ammonium sulphate upon digesti

Question

Which of the following compounds is strictly UNSUITABLE for the estimation of nitrogen using Kjeldahl's method because its nitrogen cannot be quantitatively converted to ammonium sulphate upon digestion?

Prashant Kotian · Accepted Answer

Correct answer: C. Kjeldahl's method is not applicable to compounds where nitrogen is part of a heterocyclic ring (like Pyridine or Quinoline), or present in nitro (), nitroso (), or azo () groups. In these structures, the nitrogen is not quantitatively converted to upon digestion with concentrated .

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