In qualitative analysis when `H_(2)S` is passed through an aqueous solution of salt acidified with dil. HCL, a block precipitate is obtainned .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 given ....... .A. 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 `(ON_(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 block precipitate is obtainned .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 given ....... .A. 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 `(ON_(3))_(2)`
Answer» Correct Answer - B In qualitative analysis when `H_(2)S` is passed through an aqueous sloution of salt acidified with dil . HCl a black ppt. of CuS is obtained . `CuSO_(4)+H_(2)Soverset(dil. HCl)tounderset("blackppt")( CuS +)H_(2)SO_(4)` On boiling CuS with dil. `HNO_(3)` it forms a blue coloured solution and the following reactions occur `3CuS+8HNO_(3)to3Cu(NO_(3))_(2)+2NO+3S+4H_(2)O` `S+2HNO_(3)toH_(2)SO_(4)+NO` `2Cu^(2+)+SO_(4)^(2-)+2NH_(3)+2H_(2)OtoCu(OH)_(2)CuSO_(4)+2NH_(4)OH` `Cu(OH)_(2)CuSO_(4)+8NH_(3)tounderset("Tetraammine copper"(\|\|)("Deep blue solution"))(2[Cu(NH_(3))_(4)]SO_(4)+2OH^(-)+SO_(4)^(2-)`

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