In qualtiative analysis when H_(2)S is passed through aqueous solution of salt acidified with dil. HCl, a black precipitate with dill. HNO_(3), it forms a solution of blue colour. Addition of excess of aqueus soltion of ammonia to this solution gives........ .

In qualtiative analysis when H_(2)S is passed through aqueous solution

1.	In qualtiative analysis when H_(2)S is passed through aqueous solution of salt acidified with dil. HCl, a black precipitate with dill. HNO_(3), it forms a solution of blue colour. Addition of excess of aqueus soltion of ammonia to this solution gives........ .
Answer» DEEP blue PRECIPITATE of `Cu(OH)_(2)` deepblue solution of `[Cu(NH_(3))_(4)]^(2+)` deep blue solution of `Cu(NO_(3))_(2)` deep blue solution of `Cu(OH)_(2).Cu(NO_(3))_(2)` Solution :`underset(CuSO_(4)+H_(2)Soverset(Dil.HCl)tounderset("Blck PPT.")(CuS+H_(2)SO_(4)),Cus+2HNO_(3)tounderset("Blue solution")(Cu(NO_(3))_(2))+H_(2)S` `Cu(N_(3))_(2)+4NH_(3)tounderset(("Deep blue solution"))[[Cu(NH_(3))_(4)]^(2+)+2NO_(3)^(-)`