In Dumas method for estimation of nitrogen,$0.50 \ g$ of an organic compound gave $70 \ mL$ of nitrogen collected at $300 \ K$ and $715 \ mm$ pressure. The percentage of nitrogen in the organic compound is . . . . . . $ \% $ (Aqueous tension at $300 \ K$ is $15 \ mm$).

For the estimation of nitrogen,$1.4 \ g$ of an organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in $60 \ mL$ of $\frac{M}{10}$ sulphuric acid. The unreacted acid required $20 \ mL$ of $\frac{M}{10}$ sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is .....$\%$

$2.18 \ g$ of an organic compound containing sulphur produces $0.12 \ g$ of $BaSO_4$. The percentage of sulphur in the compound is?

Match Column-$I$ and Column-$II$ with the correct relation:

Column-$I$	Column-$II$
$(i)$. Estimation of carbon and hydrogen	$(p)$. $AgX$
$(ii)$. Estimation of nitrogen	$(q)$. $CO_2$ and $H_2O$
$(iii)$. Estimation of halogen	$(r)$. $N_2$
$(iv)$. Estimation of sulphur	$(s)$. $Mg_2P_2O_7$
$(v)$. Estimation of phosphorus	$(t)$. $BaSO_4$

Quantitative measurement of nitrogen in an organic compound is done by the method:

In Dumas method for estimation of nitrogen,$0.3 \ g$ of an organic compound gave $41.9 \ mL$ of nitrogen gas at $\text{STP}$. What is the percentage of nitrogen (in $.5$)?