$0.259 \ g$ of an organic compound gives $0.350 \ g$ of $BaSO_4$ upon treatment. Calculate the percentage of sulphur in the compound. (Atomic masses: $Ba = 137, S = 32, O = 16$) (in $\%$)

Differentiate between the principle of estimation of nitrogen in an organic compound by $(i)$ Dumas method and $(ii)$ Kjeldahl's method.

$0.400 \ g$ of an organic compound $(X)$ gave $0.376 \ g$ of $AgBr$ in Carius method for estimation of bromine. The $\%$ of bromine in the compound $(X)$ is $.........$. (Given: Molar mass $AgBr = 188 \ g \ mol^{-1}$,$Br = 80 \ g \ mol^{-1}$)

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

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

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)