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Alkaline earth metals show a stable +2 Oxidation state but not +1 oxidation state due to

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Hydration energy is higher than the second Ionisation Potential

lower Ionisation potential value

Strong electro positive nature

Hydration energy is lower than the second Ionisation Potential

answer is B.

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Detailed Solution

For alkaline earth metals, their hydration energy is higher than the second Ionisation Potential. Hence, first M (alkaline earth metal) forms M⁺ and their again they lose one more electron and forms M²⁺.

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