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 _________. (i) deep blue precipitate of Cu (OH)2 (ii) deep blue solution of [Cu (NH3)4]2+ (iii) deep blue solution of Cu(NO3)2 (iv) deep blue solution of Cu(OH)2.Cu(NO3)2

In qualitative analysis when H2S is passed through an aqueous solution

1.	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 _________. (i) deep blue precipitate of Cu (OH)2 (ii) deep blue solution of [Cu (NH3)4]2+ (iii) deep blue solution of Cu(NO3)2 (iv) deep blue solution of Cu(OH)2.Cu(NO3)2
Answer» (ii) deep blue solution of [Cu (NH₃)₄]²⁺