1.

A student was given a sample of colourless solution containing three cations and was asked to identify the cations.Student carried out a series of reactions as given below. White precipitate 'A' is not soluble in:

Answer»

`NH_3`
2M HCl
KCN
`Na_2S_2O_3`

SOLUTION :(A)`AGCL+2NH_3 to [Ag(NH_3)_2]Cl` SOLUBLE complex.
(B)2M HCl is GROUP reagent of `1^(st)` group but in concentrated HCl AgCl dissolves forming `[AgCl_2]^(-)` complex
(C )`AgCl+2CN^(-)to [Ag(CN)_2]^(-)`(soluble complex) +`Cl^-`
(D)`AgCl+2S_2O_3^(2-)to[Ag(S_2O_3)_2]^(3-)`(soluble complex) +`Cl^-`


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