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JEE Main 2002
Exam
JEE Main
Year
2002
Subject
Chemistry
Chapter
Ionic Equilibrium

JEE Main 2002 · Chemistry · Ionic Equilibrium

How do we differentiate between Fe^ 3+ and Cr^ 3+ in group III?

How do we differentiate between Fe3+\mathrm{Fe}^{3+} and Cr3+\mathrm{Cr}^{3+} in group III?

Options

  1. Aby taking excess of NH4OH\mathrm{NH}_4 \mathrm{OH} solution
  2. Bby increasing NH4+\mathrm{NH}_4{ }^{+}ion concentration
  3. Cby decreasing OH−\mathrm{OH}^{-}ion concentration
  4. Dboth (b) and (c)

Correct answer

D. both (b) and (c)

Step-by-step solution

NH4+\mathrm{NH}_4^{+}ions are increased to suppress release of OH\mathrm{OH} ions, hence solubility product of Fe(OH)3\mathrm{Fe}(\mathrm{OH})_3 is attained. Colour of precipitate is different.
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