JEE Main | 2014Mole ConceptHard
Question
For the estimation of nitrogen, 1.4 g of an organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60 mL of 
sulphuric acid. The unreacted acid required 20 mL of sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is
sulphuric acid. The unreacted acid required 20 mL of sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound isOptions
A.6 %
B.10 %
C.3 %
D.5 %
Solution
As per question
(ngeq)H2SO4 = (ngeq)NaOH + (ngeq)NH3
+ (ngeq)NH3 
+ (ngeq)NH3 (ngeq)N =
(nmol)N = (nmol)NH3 = (ngeq)NH3 =
(Mass)N =
= 0.14 gPercentage of ″N″ =
× 100 = 10% Create a free account to view solution
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