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

1.	How do we differentiate between Fe^(3+) and Cr^(3+) in group III^(rd)?
Answer» By adding excess of `NH_(4)OH` solution By increasing `NH_(4)^(+)` ion concentration By decreasing `OH^(-)` ion concentration Both (b) and (c) Solution :`Cr^(+3) overset(NH_(4)OH)UNDERSET("Excess")rarr underset(("SOLUBLE)-violet/pink solution"))([Cr(NH_(3))_(6)]^(3+))` `FE^(3+) overset(NH_(4)OH)underset("Excess")rarr underset(("Reddish brown ppt"))(Fe(OH)_(3)darr)`

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