From the solution containing copper `(+2)` and zinc `(+2)` ions copper can be selectively precipitate using sodium sulphide.

Options

A. T T T T
B. T F T T
C. F F T T
D. F T F T

Answer

C

Explanation

`S_1`:In aqueous medium of sodium sulphide, both `Cu^(2+) and Zn^(2+)` will precipitate as their sulphides.Concentration of `S^(2-)` ions provided by the ionization of `Na_2S` in aqueous solution is sufficient to precipitate both the ions.
`S_2`:`Ca^(2+)` and `Mg^(2+)` will not precipitate as `K_(sp)` of their hydroxides are very high.
`Bi^(3+)+3(OH^-)toBi(OH)_3 darr` (White)
`Al^(3+)+3(OH^-)toAl(OH)_3darr` (white)
`S_3:2Cl^(-)+MnO_2+H_2SO_4 +2H^(+)toMn^(2+)+SO_4^(2-)+2H_2O+Cl_2 uarr` (greenish yellow)
` (##RES_INO_RK_JA_C08_E01_1061_S01.png" width="80%">