An aqueous solution of a white salt A gives a white precipitate B on treatment with dilute HCl in cold condition. B is soluble in boiling water. An aqeous solution of A gives a yellow precipitate on treatment with a solution of `K_(2)CrO_(4)`. The soda extract of A is acidified with diolute `H_(2)SO_(4)`, boiled to remove `CO_(2)` and treated with a freshly prepared solution of `FeSO_(4)`. concentratd `H_(2)SO_(4)` is added to the resulting solution. a brownn ring is formed at the junction of the two layers.
Q. A solution of A, when treated with `NH_(3)`, gives:

Options

A. a white precipitate soluble in an axcess of `NH_(3)`
B. a whiite precipitate insoluble in an excess of `NH_(3)`
C. a grey precipitate solugble in an excess of `NH_(3)`
D. a grey precipitate insoluble in an excess of `NH_(3)`

Answer

B