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

Explain the principle and estimation method for carbon and hydrogen in an organic compound.

In Dumas' method for estimation of nitrogen,$0.3 \ g$ of an organic compound gave $50 \ mL$ of nitrogen collected at $300 \ K$ temperature and $715 \ mm$ pressure. Calculate the percentage composition of nitrogen in the compound. (Aqueous tension at $300 \ K = 15 \ mm$)

Discuss the Dumas method and its principles for the estimation of $N$ present in an organic compound.

Kjeldahl's method cannot be used to estimate nitrogen for which of the following compounds?

In sulphur estimation, $2.0 \times 10^{-3}$ mol of an organic compound $(X)$ (molar mass $76 \text{ g mol}^{-1}$) gave $0.4813 \text{ g}$ of barium sulphate (molar mass $233 \text{ g mol}^{-1}$). The percentage of sulphur in the compound $(X)$ is . . . . . . $\% \times 10^{-1}$ (Nearest integer).