Compare the alkali metals and alkaline earth metals with respect to (a) ionisation enthalpy, (b) basicity of oxides and (c ) solubility of hydroxides.

Explanation

To compare alkali metals and alkaline earth metals with respect to ionization enthalpy, basicity of oxides, and solubility of hydroxides, we can break down the analysis into three parts:

### (a) Ionization Enthalpy

1. **Definition**: Ionization enthalpy is the energy required to remove an electron from an atom in its gaseous state.
2. **Comparison**: The ionization enthalpy of alkali metals (Group 1) is lower than that of alkaline earth metals (Group 2).
3. **Reason**:
- Alkali metals have a larger atomic size compared to alkaline earth metals.
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