Alkaline earth metals have only positive oxidation state. This is due to their:

high melting point

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high electronegativity

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Softness

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low ionisation potential

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Solution

The correct option is D low ionisation potential
The alkaline earth metals have very low ionization energies due to their fairly large size of the atoms.. So, they easily lose electrons to form positively charged ions (cations). This is the reason they have only positive oxidation state.

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