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Q.

0.2gm of organic compound is subjected to kjeldahl’s method, the ammonia evolved was absorbed in 60 ml of 0.1M H2SO4, excess of acid (unused) required 40ml of 0.1 M NaOH for complete neutralisation . Percentage of Nitrogen in the compound is

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a

46 %

b

56%    

c

28%    

d

17%

answer is B.

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Detailed Solution

NaVa = 12, NbVb=4

No. of milli equivalents of acid neutralized by NH3=124=8  % of nitrogen = 1.4×80.2=56

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