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Alkaline earth metals exhibit $+ 2$ oxidation state in aqueous solution due to

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a

their low second ionization potential

b

their hydration energies being higher than second ionization potential

c

their hydration energy being less than second ionization potential

d

small size of metal atoms

answer is A.

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Detailed Solution

The alkaline earth metals are the elements of group 2 in the modern periodic table. General electronic configuration of group 2 elements are ${ns}^{2}$ , s-orbit of alkaline earth metal elements are completely full. They tend to lose two electrons to form cation with charge of $+ 2$ . Alkaline earth metals exhibit +2 oxidation state in aqueous solution due to their hydration energies being higher than second ionization potential.

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