The reagents like AgNO_(3),K_(4)[fe(CN)_(6)],KCNS,KI,K_(2)CrO_(4) Nessler's ect, find extenstive and very important applicasionin quentitative analysis because these resgents form different type of produce with different cation for axample KI form yellow precipitate with Pb^(2+) but at form red iprecipitate with Hg^(2+) , Hence these reagents are widelyused in the quantitative amalysis of morgenic salts Which of the following cation (i.e. basic radicals) forms coloured (not white) percipitates with aqueous solution ofpotassium indide the precipitete does notdissolveis exiess og reagent?

The reagents like AgNO_(3),K_(4)[fe(CN)_(6)],KCNS,KI,K_(2)CrO_(4) Ness

1.	The reagents like AgNO_(3),K_(4)[fe(CN)_(6)],KCNS,KI,K_(2)CrO_(4) Nessler's ect, find extenstive and very important applicasionin quentitative analysis because these resgents form different type of produce with different cation for axample KI form yellow precipitate with Pb^(2+) but at form red iprecipitate with Hg^(2+) , Hence these reagents are widelyused in the quantitative amalysis of morgenic salts Which of the following cation (i.e. basic radicals) forms coloured (not white) percipitates with aqueous solution ofpotassium indide the precipitete does notdissolveis exiess og reagent?
Answer» `Hg^(2+)` `Hg_(2)^(2+)` `BI^(3+)` `Cu^(2+)` Solution :(a) `Hg^(2+) + 21^(Theta) rarr HgI_(2) darr (red //"scalet")` `HgI_(2) + 21^(Theta) rarr [HgI_(4)]^(2-)` (soluble complax) (b).`Hg_(2)^(2+) + 2I^(Theta) rarr Hg_(2)I_(2) darr` (green) `Hg_(2)I_(2) + 21^(Theta) rarr [HgI_(4)]^(2-) + Hg darr` (BLACK). (c). `Bi^(3+) + 3I^(Theta) rarr BIi_(3) darr` (black) `BiI_(3) darr + 1^(Theta)[BiI_(4)]^(Theta)` (orange colour soluble complex) (d).`2Cu^(2+) + 5I^(Theta) rarr 2CuI darr (white) + 1_(3)^(Theta)`