The volume of nitrogen is measured by which apparatus in the Dumas method?

Which of the following compounds will not give a positive Lassaigne's test for nitrogen?

In Lassaigne's test for the detection of halogens,the sodium fusion extract is first boiled with concentrated nitric acid. This is

How is the silver halide obtained from an organic compound distinguished?

Statement $I$: Nitrogen in pyridine cannot be estimated by Kjeldahl’s method. Statement $II$: Nitrogen in pyridine changes to ammonium sulphate when heated with conc. $H_2SO_4$ in Kjeldahl’s method. Read the above given statements and choose the correct answer from the given options.

In the Lassaigne's test for the detection of sulfur,which substance is responsible for the formation of black precipitates?