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

How do we differentiate between `Fe^(3+)` and `Cr^(3+)` in group lll?
A. By taking excess of `NH_(4)OH`
B. By increasing `NH_(4)^(+)` ion concentration
C. By decreasing `OH^(-)` ion concentration
D. Both (a) and (c)

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

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