1.

How do you differentiate between Fe^(3+) and Cr^(3+)in qualitative analysis group III ?

Answer»

By taking excess of `NH_4OH`
By increasing `NH_4^(+)` ion concentration
By decreasing `OH^(-)` ion concentration
Both (B) and (C).

Solution :`K_(sp)` of `Fe(OH)_3` is less than `K_(sp)` of `CR(OH)_3` . Therefore , `Fe^(3+)` is PRECIPITATED at lower `[OH^(-)]`


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