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Compare the alkali metals and alkaline earth metals with respect to – 

(i). ionization enthalpy 

(ii). basicity of oxides and 

(iii). solubility of hydroxides

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(i). Ionization enthalpy: Because of high nuclear charge the ionization enthalpy of alkaline earth metals are higher than those of the corresponding alkali metals.

(ii). Basicity of oxides: Basicity of oxides of alkali metals are higher than that of alkaline earth metals.

(iii). Solubility of hydroxides: Solubility of hydroxides of alkali metals are higher than that of alkaline earth metals. Alkali metals due to lower ionization enthalpy are more electropositive than the corresponding group 2 elements.

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