Lassaigne's extract is boiled with dilute ${\mathrm{HNO}}_3$ before testing for halogens because

The compound formed in the positive test for nitrogen with the Lassaigne's solution of an organic compound is:

Beilstein test is given by:

In Lassaigne's test, when both $\mathrm{N}$ and $\mathrm{S}$ are present, the blood-red colour obtained is due to the formation of:

Carius method is not reliable for the estimation of:

Amongst the following, which liquids are taken in nitrometer in Dumas method?

$0.5264 \mathrm{g}$ of silver bromide is obtained from $0.5124 \mathrm{g}$ of an organic compound. The percentage of bromine in the compound is

In Kjeldahl's method, ammonia from $5 \mathrm{g}$ of food neutralizes $30 \mathrm{mL}$of $0.1 \mathrm{N}$ acid. The percentage of nitrogen in the food is:

$0.24 \mathrm{g}$ of an organic compound gives $0.22 \mathrm{g} {\mathrm{CO}}_2$ on complete combustion. If it contains $16.6\%$ hydrogen, the percentage of carbon and oxygen, respectively are: