Sometimes a red colour is not produced in the Lassaignes test even if both nitrogen and sulphur are present in the Organic compound. Explain

Assertion : Absence of blood red colouration, during the Lassaigne's test for nitrogen definitely shows the absence of sulphur in the organic compound. Reason : Organic compounds containing both nitrogen and sulphur will necessarily give blood red colouration during the Lassaigne's test for nitrogen.

Write the chemical equations involved in the detection of N, halogen and sulphur present in an organic compound by Lassaigne's test.

Write the name of the test used to detect nitro gen, sulphur, halogens and phosphorous present in an organic compound.

Discuss the principle of estimation of halogens, sulphur and phosphorus present in an organic compound?

Explain any one method for the estimation of ni- trogen present in an organic compound.

In which of the following compounds, Lassaigne's test for nitrogen is +ve

The blood red colouration obtained during the test for nitrogen indicates the presence of which elements?

Which among the following may give a blood red colouration, during Lassaigne's test for nitrogen?

In the estimation of nitrogen present in an organic compound, Kjeldahl's method cannot be applied to