Which of the following statements is /are true ?

Options

A. `Ag^(+)` ions do not give white precipitate with excess of concentrated `HCl`
B. `Cu^(2+)` ions produce a white precipitate when `KCN` solution is added in a small quantity.
C. `Hg^(2+)` ions give deep blue precipitate with cobalt acetate and ammonium thiocyanate.
D. Black precipitate of `Bil_(3)` turns orange when heated with water.

Answer

A,B,C,D

Explanation

(A)`Ag^(+)+Cl^(-)toAgCldarr, AgCl+Cl^(-)to[AgCl_(2)]^(-)`(soluble complex).
(B)`Cu^(2+)+2CN^(-)toCu(CN)_(2)darr`(yellow),`Cu(CN)_(2)darrto2CuCNdarr`(white)+`(CN)_(2)`.
( C)`(CH_(3)COO)_(2)Co + 2NH_(4)SCNtoCo(SCN)_(2)+2CH_(3)COONH_(4)`
`Hg^(2+)+Co^(2+)+4SCN^(-) to Co[Hg(SCN)_(4)]g darr` (deep-blue)
(D)`Bil_(3) darr +H_(2)O to BiOl darr ("orange")+2H^(+)+2l^(-)`