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JEE Main2002ChemistryIonic EquilibriumActual

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

Options

  1. Aby taking excess of NH ₄ OH solution
  2. Bby increasing NH ₄ ⁺ ion concentration
  3. Cby decreasing OH ⁻ ion concentration
  4. Dboth (b) and (c)

Correct answer

D. both (b) and (c)

Step-by-step solution

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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