MCQ
How do we differentiate between Fe3+ and Cr3+ in group III?
- ABy taking excess of NH4OH
- BBy increasing $\text{NH}_4^+$ ion cocentration
- CBy decreasing OH− ion concentration
- DBoth (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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