logo

Ask Questions, Get Answers

 
X
 Search
Want to ask us a question? Click here
Browse Questions
Ad
0 votes

Kjeldahl's method cannot be used for estimation of nitrogen in $(i)\; C_6H_5NO_2 ;\; (ii)\;Pyridine; \;(iii)\;C_6H_5 - N = N -C_6H_5 ;\;(iv)\;C_6H_5NHCOCH_3 $

$ (a)\;(i),(ii) and\;(iii) \\ (b) \; (ii),(iii)\;and \;(iv) \\ (c) \;(i),(ii)\;and \;(iv) \\ (d)\;(i),(iii)\;and (iv) $

Can you answer this question?
 
 

1 Answer

0 votes
Kjeldahl method is not applicable to compounds containing nitrogen in nitro and azo groups and nitrogen present in rings (e.g. pyridine) as nitrogen of these compounds does not convert to ammonium sulfate under the conditions of this method.
Since these compounds are not completely converted into $(NH_4)_2\;SO_4$ during digestion.
$ (i),(ii) and\;(iii)$ cannot be used for estimation of nitrogen using Kjeldahl's method.
Hence a is the correct answer.
answered Feb 28, 2014 by meena.p
edited Mar 20, 2014 by balaji.thirumalai
 

Related questions

Ask Question
student study plans
x
JEE MAIN, CBSE, NEET Mobile and Tablet App
The ultimate mobile app to help you crack your examinations
Get the Android App
...