Question

In qualitative analysis when H2S is passed through an aqueous solution of salt acidified with dil. HCl,

Answer 1

Question:-

In qualitative analysis when H2S is passed through an aqueous solution of salt acidified with dil. HCl, a black precipitate is obtained. On boiling the precipitate with dil. HNO3, it forms a solution of blue colour. Addition of excess of aqueous solution of ammonia to this solution gives _________. 


Answer:

deep blue solution of [Cu (NH3)4]2+