Chemistry - Salt Analysis Question with Solution | TestHub

A mixture contains a Reddish Brown metallic oxide (A) and a yellow crystalline salt (B) . When the mixture is treated with dilute sulphuric acid, it yields a clear acidic filtrate along with a yellow insoluble residue (B) .

The filtrate is divided into two equal portions.

• The first portion, on treatment with aqueous potassium ferrocyanide solution , produces a blue precipitate (C) .

•  The second portion, on addition of ammonium thiocyanate ,develops a blood-red coloration .

The insoluble residue (B) is found to be :

•  Insoluble in excess aqueous ammonia ,

•  But readily soluble in potassium cyanide solution as well as in sodium thiosulphate solution . Furthermore, the sodium extract of the original mixture, when treated with chlorine water, yields a brown solution . On shaking this solution with chloroform, the organic layer turns violet.