The Kjeldahl's method for the estimation of n | vedclass

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(B) The Kjeldahl's method is not applicable to compounds containing nitrogen in nitro $(-NO_2)$ or azo $(-N=N-)$ groups,or nitrogen present in a ring

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(B) The Kjeldahl's method is not applicable to compounds containing nitrogen in nitro $(-NO_2)$ or azo $(-N=N-)$ groups,or nitrogen present in a ring (like pyridine),because the nitrogen in these compounds is not quantitatively converted to ammonium sulphate under the conditions of the Kjeldahl's method.Among the given options:$A$. Nitrobenzene contains a nitro group.$B$. Aniline $(C_6H_5NH_2)$ contains an amino group,which is easily converted to ammonium sulphate.$C$. Azobenzene contains an azo group.$D$. Pyridine contains nitrogen in the ring.Therefore,the Kjeldahl's method can be used for Aniline.

Column $-I$	Column $-II$
$(i).$ Lassaigne's test	$(a).$ By sodium peroxide
$(ii).$ Test for nitrogen	$(b).$ Acidify with acetic acid
$(iii).$ Test for sulphur	$(c).$ Acidify with conc. sulphuric acid
$(iv).$ Test for phosphorus	$(d).$ Fusion with sodium

The Kjeldahl's method for the estimation of nitrogen can be used to estimate the amount of nitrogen in which one of the following compounds?

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