Question 10.6 Compare the alkali metals and alkaline earth metals with respect to
(i) ionization enthalpy
(ii) basicity of oxides and
(iii) solubility of hydroxides.
Class XI The s-Block Elements Page 305
(i) ionization enthalpy
(ii) basicity of oxides and
(iii) solubility of hydroxides.
Class XI The s-Block Elements Page 305
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(i) Ionisation enthalpies:- the first Ionisation enthalpies of alkali metals are lower than the corresponding alkaline earth metals. This is due to their large size as compared to alkaline earth metals. But second Ionisation enthalpies of the alkaline earth metals are smaller than those of the corresponding alkali metals.
(ii) basicity of oxides: The oxides of the alkali and alkaline earth metals dissolves in water to form basic hydroxides. The alkaline earth metal hydroxides are however less basic and less stable than alkali metal hydroxides.
(iii) solubility of hydroxides: The solubility of hydroxides of alkaline earth metals is relatively less than their corresponding alkali metal hydroxides.