Which pair of ions among the following can be | vedclass

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(A) The separation of lanthanoids is difficult due to their similar chemical properties. However, $Eu(II)$ shows similarity with alkaline earth metals

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$Eu(II)$ and $Dy(III)$

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(A) The separation of lanthanoids is difficult due to their similar chemical properties. However, $Eu(II)$ shows similarity with alkaline earth metals like $Sr(II)$.$Eu(II)$ can be precipitated as $EuSO_4$ in the presence of sulfate ions, similar to $SrSO_4$, while other trivalent lanthanoid ions like $Dy(III)$ or $Gd(III)$ remain in the solution.Therefore, the pair $Eu(II)$ and $Dy(III)$ (or any other trivalent lanthanoid) can be separated by the precipitation method.

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

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