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
A. deep blue precipitate of Cu (OH)2
B. deep blue solution of [Cu(NH3)4]2+
C. deep blue solution of Cu(NO3)2
D. deep blue solution of Cu(OH)2. CU(NO3)2
Answer:B
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
A. deep blue precipitate of Cu (OH)2 B. deep blue solution of [Cu(NH3)4]2+ C. deep blue solution of Cu(NO3)2 D. deep blue solution of Cu(OH)2. CU(NO3)2