Consider the following abbreviations for hydrated What is the correct order of size of these hydrated alkali ions? n n n x Li H O , y Na H O ,z K H O (J & K CET 2006)

We know that the hydration enthalpy and size of hydration ion decreases down the group. Therefore, the correct order of size of hydrated alkali ions is and as per the given notation of the question, the correct order is X > Y > Z.