How do we differentiate between Fe^(3+) and Cr^(3+) ions in group III

1.	How do we differentiate between Fe^(3+) and Cr^(3+) ions in group III ?
Answer» By adding excess of `NH_(4)OH` solution By increasing `NH_(4)^(+)` ion concentration By decreasing `OH^(-)` ion concentration Both (B) and (c) are correct Solution :`k_(sp)` VALUE of `Fe(OH)_(3)` is less that of `Cr(OH)_(3)`. THEREFORE, the concentration of `OH^(-)` IONS in the solution, can be limited by either increasing `NH_(4)^(+)` ion concentration or by decreasing `OH^(-)` ion concentration

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