First group of basic radicals (cation) involve analysis of presence of Pb^(2+), Ag^(+)and Hg_(2)^(+2)ions in the salt. The chloride salts of these metal ions are sparingly soluble in water and their K_(sp) values are as follows. K_(sp) [PbCl_(2)] = 10^(-12), K_(sp)[AgCl] = 10^(-10), K_(sp)[Hg_(2)Cl_(2)] = 10^(-18) Then sequence of precipitation of these salts on adding dilute HCl to the equimolar mixture of these metal ions will be :

First group of basic radicals (cation) involve analysis of presence of

1.	First group of basic radicals (cation) involve analysis of presence of Pb^(2+), Ag^(+)and Hg_(2)^(+2)ions in the salt. The chloride salts of these metal ions are sparingly soluble in water and their K_(sp) values are as follows. K_(sp) [PbCl_(2)] = 10^(-12), K_(sp)[AgCl] = 10^(-10), K_(sp)[Hg_(2)Cl_(2)] = 10^(-18) Then sequence of precipitation of these salts on adding dilute HCl to the equimolar mixture of these metal ions will be :
Answer» `PbCl_(2), AgCl` and then `Hg_(2)Cl_(2)` `Hg_(2)Cl_(2), PbCl_(2)` and then AgCl `AgCl, PbCl_(2)` and then `Hg_(2)Cl_(2)` `Hg_(2)Cl_(2), AgCl` and then `PbCl_(2)` SOLUTION :On using equimolar mixture of these metal ions the required `CL^(-)` concentration is in order `Hg_(2)Cl_(2) lt AgCl lt PbCl_(2)` HENCE SEQUENCE of ppt. will follow this order.