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In qualitative analysis when H(2)S is pa...

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 gives

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(NO_(3))_(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
`underset(CuSO_(4)+H_(2)Soverset(Dil.HCl)tounderset("Blck ppt.")(CuS+H_(2)SO_(4)),Cus+2HNO_(3)tounderset("Blue solution")(Cu(NO_(3))_(2))+H_(2)S`
`Cu(N_(3))_(2)+4NH_(3)tounderset(("Deep blue solution"))[[Cu(NH_(3))_(4)]^(2+)+2NO_(3)^(-)`
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Knowledge Check

  • 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 the second group of qualitative analysis, H_(2)S is pass through a solution acidified with HCl in order to :

    A
    limit the concentration of `S^(2-)` ions
    B
    increase the solubility of `H_(2)S`
    C
    increase the concentration of `S^(2-)` ions
    D
    provide extra `Cl^(-)` ions

  • When H_2S is passed through an ammoniacal salt solution X, a buff coloured precipitate is obtained. Then X can be a

    A
    `Co^2+` solution
    B
    `Mn^2+` solution
    C
    `Ni^2+` solution
    D
    `Zn^(2+)` solution

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