Verified Solution • 2025–26 Session moderate

QJEEM02Chf4aa: JEE Main 2002 Chemistry - Class 12 JEEM02Chf4aa Solution: How do we differentiate between Fe 3+ and Cr 3+ in group III?

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

Multiple Choice Options

  • A by taking excess of NH4OH solution
  • B by increasing NH4+ ion concentration
  • C by decreasing OH- ion concentration
  • D both (b) and (c)

Step-by-Step Verified Solution

FeCl3 + 3NH4OH → Fe(OH)3 ↓(reddish brown) + 3NH4Cl

CrCl3 + 3NH4OH → Cr(OH)3 (Bluish green) + 3NH4Cl

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