Consider the following statements and arrange in the order of true/false as given in the codes. `S_1`:From solution containing coppe (+2) and zinc )(+
Consider the following statements and arrange in the order of true/false as given in the codes.
`S_1`:From solution containing coppe (+2) and zinc )(+2) ions, copper can be selectively precipitated using sodium sulphide.
`S_2`:Amongst `Ca^(2+),Al^(3+),Bi^(3+), and Mg^(2+)` the `NH_4Cl` and aqueous ammonia will precipitate only `Al^(3+)` as its hydroxide.
`S_3`:Sodium chloride on reaction with conc. `H_2SO_4` in presence of `MnO_2` liberates a greenish yellow gas.
`S_4`:The formation of brown precipitate on reaction with alkaline `K_2[HgI_4]` indicates the presence of `NH_4^(+)`
A. T T T T
B. T F T T
C. F F T T
D. F T F T
1 Answers
Correct Answer - C
`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)