In qualitative analysis when `H_(2)S` is passed through an aqueous solution of salt acidified with dil. HCl, a black precipitate is obtained. On boiling the precipitate with dil. `HNO_(3)`, it forms a solution of blue colour. Addition of excess of aqueous solution of ammonia to this solution givesA. deep blue precipitate of `Cu(OH)_(2)`B. deep blue solution of `[Cu(NH_(3))_(4)]^(2+)`C. deep blue solution of `Cu(NO_(3))_(2)`D. deep blue solution of `Cu(OH)_(2).Cu(NO_(3))_(2)`

In qualitative analysis when `H_(2)S` is passed through an aqueous sol

1.	In qualitative analysis when `H_(2)S` is passed through an aqueous solution of salt acidified with dil. HCl, a black precipitate is obtained. On boiling the precipitate with dil. `HNO_(3)`, it forms a solution of blue colour. Addition of excess of aqueous solution of ammonia to this solution givesA. deep blue precipitate of `Cu(OH)_(2)`B. deep blue solution of `[Cu(NH_(3))_(4)]^(2+)`C. deep blue solution of `Cu(NO_(3))_(2)`D. deep blue solution of `Cu(OH)_(2).Cu(NO_(3))_(2)`
Answer» Correct Answer - B `CuSO_(4)+H_(2)Soverset("dil. HCl")rarrunderset("Black ppt.")(CuSdarr)+H_(2)SO_(4)` `CuS+2HNO_(3"(dil.)")overset(Delta)rarrunderset("Blue solution")(Cu(NO_(3))_(2))+H_(2)S` `Cu(NO_(3))_(2)+4NH_(3)rarrunderset ("Deep blue solution")([Cu(NH_(3))_(4)]^(2+))+2NO_(3)^(-)`

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