Question

Which compound gives blue colour dring the test for nitrogen in sodium compounds a) Benzenediazonium Chloride b) Carbamide c) Hydrazine d) None​

Answer 1

Answer:

none because in your options the compound which gives blue colour does not exist

Answer 2

Answer:

d) None

Explanation:

The lassaigne test is the test used for the detection of halogens, sulphur and nitrogen in an organic compound. The ionic compounds thus formed during the fusion are then extracted in an aqueous solution that be detected by simple chemical tests. The extract is known as the sodium fusion extract or Lassaigne's extract.

In the case of nitrogen, the following process takes place -

Na+C+NΔ→NaCN

2NaCN + FeSO4 → Fe(CN)2+Na2SO4

Fe(CN)2+4NaCN → Na4[Fe(CN)6]

3Na4[Fe(CN)6]+4Fe3 → Fe4[Fe(CN)6]3+12Na+

Thus, the compound that gives blue colour during the test is ferri-ferrocyanide.