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Q.

The separation of lanthanoids by the ion exchange method is based on

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a

Basicity of the hydroxides 

b

Size of the hydrated ions 

c

The solubility of their nitrates 

d

Size of the anhydrated ions

answer is D.

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Detailed Solution

Lathanoid elements are separated by ion-exchange method is based on the fact that radii of hydrated lanthanoid ions increase with increasing atomic number. Thus, when a solution of many lanthanoid ions passes slowly through the column of cation exchange resin, the heavier ions will come through first.
 

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The separation of lanthanoids by the ion exchange method is based on