Detection of elements like nitrogen, halogens and sulphur are done using Lassigne's test. Discuss the chemistry of Lassigne's test for the above elements

How is nitrogen detected by Lassaignes test?

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

How will you detect the presence of chlorine in an organic compound using Lassaigne's test?

Soda lime test is used for the detection of

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

Write the formula of prussion blue colour formed in lassalgne's test for nitrogen detection.

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.

Justify the following statements. i. Water mixed with formic acid cannot be separated by fractional distillation. ii. o -nitrophenol is steam volatile while p-nitrophenol is not. iii. Freshly prepared FeSO_4 solution is insisted during the test for nitrogen in Lassaignes test. iv. Copper spiral is used in the apparatus for Dumas method.