How many of the following reagents give pure white precipitate with an aqueous solution of Ag(I) salt ? Concentrated `HCl, Kl, K_2CrO_4, Na_2CO_3,NaCN` (in small amount), `K_4[Fe(CN)_6]`

Answer

2

Explanation

(a)With concentrated HCl precipitation does not occur.
AgCl+`Cl^(-)to[AgCl_2]^(-)` (soluble complex)
(b)`Ag^(+)+I^(-)toAgIdarr` (bright yellow)
(c )`2Ag^(+)+CrO_4^(2-)toAg_2CrO_4darr`(red)
(d)`2Ag^(+)+CO_3^(2-)toAg_2CO_3darr` (yellowish-white )
(e)`Ag^(+)+CN^(-)` (small amount ) `to AgCN darr` (white)
(f)`4Ag^(+)+[Fe(CN)_6]^(4-)toAg_4[Fe(CN)_6]darr`(white)