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 hydroxide does not dissolve in ammounts solutionbut sisolves in sodiumhydroxide ?

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 hydroxide does not dissolve in ammounts solutionbut sisolves in sodiumhydroxide ?
Answer» `ZN(OH)_(2)` `Cd(OH)_(2)` `Cu(OH)_(2)` `AI(OH)_(3)` Solution :`Zn(OH)_(2)` dissolves in both `NaOH` and `NH_(3)` forming `[Zn(OH)_(4)]^(2-)` and `[Zn(NH_(3))_(4)]^(2+)` RESPECTIVELY . (B) `Cd(OH)_(2)` dissolves in ammonic but does not disolve in `NaOH` (c ) `Cu(OH)_(2) + NH_(3) rarr [Cu(NH_(3))_(4)]^(2+)`, which is a soluble complax butdoes notdissolve in `NaOH`. (d) `AI(OH)_(3) + OH^(Theta) rarr [AI(OH)_(4)]^(Theta)`.Which is a soluble complaxbut does not dissolve in `NH_(3)`.