How do we differentiate between Fe3+ and Cr3+ in group III? - Vidyadip

MCQ

How do we differentiate between Fe³⁺ and Cr³⁺ in group III?

A
By taking excess of NH₄OH
B
By increasing $\text{NH}_4^+$ ion cocentration
C
By decreasing OH⁻ ion concentration
D
Both (b) and (c)

✓

Answer

Both (b) and (c)

Explanation:

$\text{NH}_4^+$ ions are increased to suppress release of OH^–ions, hence solubility product of Fe(OH)₃ is attained.

Colour of precipitate is different.

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