In Kjeldahl's method for estimation of nitrogen,$CuSO_4$ acts as :

The transformation occurring in Dumas's method is given below:
$C_{2}H_{7}N + (2x + \frac{y}{2})CuO \rightarrow xCO_{2} + \frac{y}{2}H_{2}O + \frac{z}{2}N_{2} + (2x + \frac{y}{2})Cu$
The value of $y$ is ...... .(Integer answer)

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?

Describe the Kjeldahl's method and the principles for the estimation of nitrogen present in an organic compound.

In the Carius method for the estimation of halogens,$0.15 \ g$ of an organic compound gave $0.12 \ g$ of $AgBr$. Find out the percentage of bromine in the compound.