Q36 / 155 · WBJEE 2025 · Chemistry

Which pair of ions among the following can be separated by precipitation method?

  • Correct answer
    A
    Eu(II) and Dy(III)
  • B
    Gd(III) and Dy(III)
  • C
    $\mathrm{Eu}(\mathrm{II})$ and $\mathrm{Yb}(\mathrm{II})$
  • Correct answer
    D
    Eu(II) and Gd(II)

Solution

$\mathrm{A} \rightarrow \mathrm{Eu}^{+2}$ and $\mathrm{yb}^{2+}$ have unique property \& show similarity with $\mathrm{Sr}^{+2}$. Hence $\mathrm{EuSO}_4$ is insoluble like $\mathrm{SrSO}_4$ & other lanthanide ions remains unaffected in solution. $\mathrm{D} \rightarrow$ fact

Hence, the correct answer is options: 'A', 'D'.

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