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How do we differentiate between Fe^(3+) ...

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

A

By adding excess of `NH_(4)OH` solution

B

By increasing `NH_(4)^(+)` ion concentration

C

By decreasing `OH^(-)` ion concentration

D

Both (b) and (c) are correct

Text Solution

Verified by Experts

The correct Answer is:
B
`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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