In $Duma's$ method for estimation of nitrogen,$0.25 \ g$ of an organic compound gave $40 \ mL$ of nitrogen collected at $300 \ K$ temperature and $725 \ mm$ pressure. If the aqueous tension at $300 \ K$ is $25 \ mm$,the percentage of nitrogen in the compound is:

In the estimation of phosphorus in an organic compound,phosphorus is $NOT$ weighed in the form of which of the following substances?

In Kjeldahl's method for the estimation of nitrogen,the formula used is

Consider the following reaction. On estimation of bromine in $1.00 \ g$ of $R$ using Carius method,the amount of $AgBr$ formed (in $g$) is . . . .
$\overline{[Given :}$ Atomic mass of $H = 1, C = 12, O = 16, P = 31, Br = 80, Ag = 108]$

In Carius method for estimation of halogens,$0.2 \, g$ of an organic compound gave $0.188 \, g$ of $AgBr$. The percentage of bromine in the compound is $......$ . (Nearest integer)
[Atomic mass: $Ag=108, Br=80$ ]

Sodium fusion extract of an organic compound $(Y)$ with $CHCl_3$ and chlorine water gives a violet color to the $CHCl_3$ layer. $0.15 \ g$ of $(Y)$ gave $0.12 \ g$ of the silver halide precipitate in the Carius method. The percentage of halogen in the compound $(Y)$ is . . . . . . . (Nearest integer). (Given: molar mass $g \ mol^{-1} C : 12, H : 1, Cl : 35.5, Br : 80, I : 127$)