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28 mg of an organic compound containing ...

28 mg of an organic compound containing nitrogen was digested according to Kjeldahl's method and the evolved ammonia was absored in 20 mL of 0.1 M HCl solution. The excess of the acid required 15 mL of 0.1 M NaOH solution for complete neutralization. Then the percentage of 'N' is the compound is

A

50

B

30

C

25

D

40

Text Solution

Verified by Experts

The correct Answer is:
C
Excess acid `= 15xx0.1xx1` m. eq.
Acid taken initially `= 20xx0.1xx1` m.eq.
Acid used for neutralisation
`=(20xx0.1xx1)-(15xx0.1xx1)=0.5` m. eq.
`% N =(NH_(3)" liberated"xx1.4)/("wt.of org. compound")=(0.5xx1.4)/(0.028)=25%`.
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