Question

Sodium fusion extract of the compound gives prussian blue colour with feso4

Answer 1

If nitrogen is present in the compound, the Lassaigne's extract would contain sodium cyanide formed during fusion. Sodium cyanide is converted to sodium ferrocyanide on treating with ferrous sulphate. On further treating it with ferric chloride, a prussian blue complex, ferricferrocyanide is formed.

Answer 2

As nitrogen is present in the compound, during fusion the would contain sodium cyanide formed.

Sodium cyanide is converted to sodium ferrocyanide on treating with ferrous sulphate. On further treating it with ferric chloride, a prussian blue complex, ferricferrocyanide is formed.

Explanation:

1. Lassaigne's extract:Nitrogenn, Sulphur, and halogens present in organic compounds are detected by Lassaigne’s test. Here, a small piece of Na metal is heated in a fusion tube with the organic compound.

2.The principle is that, in doing so, Na converts all the elements present into ionic form.The formed ionic salts are extracted from the fused mass by boiling it with distilled water. This is called sodium fusion extract.

3.The sodium fusion test, or Lassaigne's test, is used in elemental analysis for the qualitative determination of the presence of foreign elements, namely halogens, nitrogen, and sulfur, in an organic compound.