Describe the principle and reactions involved in the estimation of oxygen in an organic compound.

In the Carius method, $0.2425 \ g$ of an organic compound gave $0.5253 \ g$ of silver chloride. The percentage of chlorine in the organic compound is: (in $\%$)

$A$ sample of $0.50 \, g$ of an organic compound was treated according to Kjeldahl's method. The ammonia evolved was absorbed in $50 \, mL$ of $0.5 \, M \, H_{2}SO_{4}$. The residual acid required $60 \, mL$ of $0.5 \, M \, NaOH$ solution for neutralisation. Find the percentage composition of nitrogen in the compound. (in $\%$)

Describe the Carius method and its principle for the estimation of sulphur in an organic compound.

Dumas method involves the determination of nitrogen content in the organic compound in the form of

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)