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Organic Chemistry: Some Basic Principles and Techniques — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryOrganic Chemistry: Some Basic Principles and Techniques1 Mark
MCQ
How do we differentiate between $\mathrm{Fe}^{3+}$ and $\mathrm{Cr}^{3+}$ in group $\text{III}\ ?$
  • A
    By taking excess of $\ce{NH_4​OH}$
  • B
    By increasing $\text{NH}_4^+$​ ion cocentration
  • C
    By decreasing $\text{OH}^-$ ion concentration
  • ✓
    Both $(b)$ and $(c)$
✓

Answer

Correct option: D.
Both $(b)$ and $(c)$
$\text{NH}_4^+$ ions are increased to suppress release of $\text{OH}^-$ ions, hence solubility product of $\text{Fe(OH)}_3$ is attained.
Colour of precipitate is different.

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