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