Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • Engineering
  • Need explanation for: - Some basic concepts in chemistry - JEE Main-3

29.5 mg of an organic compound containing nitrogen was digested according to Kjeldahl's method and the evolved ammonia was absorbed 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. The percentage of nitrogen in the compound is

  • Option 1)

    29. 5

  • Option 2)

    59.0

  • Option 3)

    47.4

  • Option 4)

    23. 7

 

Answers (1)

best_answer

As we learnt ,

 

Law of Definite Proportions -

A compound always contains exactly the same propotion of elements by weight

- wherein

CaCO3 contains 40% Ca, 12% C and 48% O by weight irrespective of the source.

 

 m moles of HCl = 20 x 0.1 = 2

m moles of NaOH = 15 x 0.1 = 1.5

\therefore m moles of HCl that consumedd NH3 = 0.5

m moles of NH3  = 0.5

milligrams of N in NH3 = 0.5 x 14 = 7 mg

% N =  \frac{7}{29.5} \times 100 = 23.7 %

 


Option 1)

29. 5

Option 2)

59.0

Option 3)

47.4

Option 4)

23. 7

Posted by

satyajeet

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

Similar Questions

Trending Articles/News

anam-khan

JEE Main 2026: IIT Roorkee’s ECE emerges as top choice after CSE; closing rank rises
anam-khan

JEE Main 2026 application correction begins on jeemain.nta.nic.in; edit details by December 2
anam-khan

JEE Mains 2026 LIVE: NTA to conduct session 1 from January 21 to 30; exam pattern, syllabus

Latest Question