Which compound is formed by heating with nitric acid in the estimation of phosphorus in the Carius method?

Explain the Carius method and its principle for the estimation of phosphorus in an organic compound.

Which method is used for the quantitative estimation of nitrogen in an organic compound?

For which of the following compounds can the Kjeldahl method be used to determine the percentage of nitrogen?

The number of moles of $CuO$ that will be utilized in the Dumas method for the estimation of nitrogen in a sample of $57.5 \ g$ of $N,N$-dimethylaminopentane is $..... \times 10^{-2}$. (Nearest integer)

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 $15 \ mm$).