What is $CHN$ analysis in organic estimation?

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

In the estimation of sulphur in an organic compound,upon treatment with concentrated $HNO_3$,it is converted into:

Which method uses an instrument called a nitrometer?

In which of the following compounds is the Kjeldahl method applicable?

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 .....$\%$