Which of the following properties of elements of alkaline earth metals do not increase with increasing atomic number?

Solubility of hydroxide

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Reactivity with water

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First ionisation enthalpy

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Stability of carbonate

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Solution

The correct option is C First ionisation enthalpy
As we move down the group of alkaline earth metal the size of atom increases, so first ionisation enthalpy decreases. The alkaline earth metals have low I.E. due to their fairly large size of the atoms.

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