A) ammonium nitrite
B) ammonium sulphate
C) ammonium phosphate
D) ammonium nitrate
Correct Answer: B
Solution :
In Kjeldahl's method of estimation of nitrogen, the nitrogen present in most of the organic compounds is quantitatively converted into ammonium sulphate. The \[{{(N{{H}_{4}})}_{2}}S{{O}_{4}}\] so obtained is decomposed with excess of NaOH solution to give \[N{{H}_{3}}\], which is absorbed in an excess of standard HCl or \[{{H}_{2}}S{{O}_{4}}\] and residual mineral acid is then titrated with standard NaOH solution. Thus, option is the correct choice.
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